1,936 community and non-transient non-community water systems are listed for Wisconsin in EPA SDWIS. 206 were sampled under UCMR 5; 53 of those had at least one PFAS result at or above the reporting level, and 23 had a highest single result at or above a 2024 EPA limit (PFOA or PFOS 4 ppt, or Hazard Index 1).
Wisconsin map · Download: systems (CSV) · all results (CSV, gzip)
These are monitoring results collected under EPA's Fifth Unregulated Contaminant Monitoring Rule (UCMR 5) at entry points, where treated water enters the distribution system; they are not tap-water samples. They are not compliance determinations: compliance with EPA's 2024 PFAS limits is judged on running annual averages of compliance monitoring, required from 2029, so a single UCMR 5 result at or above a limit is not a violation. “< MRL” means the compound was not quantified at EPA's minimum reporting level; it does not mean zero.
Sampled under UCMR 5 (206)
| System | PWSID | City | Population | Highest PFOA (ppt) | Highest PFOS (ppt) | Highest HI | Highest single result |
|---|---|---|---|---|---|---|---|
| Allouez Waterworks | WI4050455 | Green Bay | 13,923 | <MRL | <MRL | 0 | No PFAS detected |
| Altoona Waterworks | WI6180280 | Altoona | 9,627 | <MRL | <MRL | 0 | No PFAS detected |
| Antigo Waterworks | WI7340086 | Antigo | 7,780 | <MRL | <MRL | 0 | No PFAS detected |
| Appleton Waterworks | WI4450333 | Appleton | 74,511 | <MRL | <MRL | 0 | Other PFAS detected |
| Arena Waterworks | WI1250073 | Arena | 877 | <MRL | <MRL | 0 | No PFAS detected |
| Ashland Water Utility | WI8020373 | Ashland | 8,000 | <MRL | <MRL | 0 | No PFAS detected |
| Ashwaubenon Waterworks | WI4050456 | Ashwaubenon | 17,730 | <MRL | <MRL | 0 | No PFAS detected |
| Baldwin Waterworks | WI6560119 | Baldwin | 4,440 | <MRL | <MRL | 0 | No PFAS detected |
| Baraboo Waterworks | WI1570085 | Baraboo | 12,703 | <MRL | <MRL | 0 | No PFAS detected |
| Barron Light & Water Dept | WI6030125 | Barron | 3,423 | <MRL | <MRL | 0 | No PFAS detected |
| Beaver Dam Water Utility | WI1140059 | Beaver Dam | 16,200 | <MRL | <MRL | 0 | No PFAS detected |
| Bellevue Waterworks | WI4050459 | Green Bay | 16,715 | <MRL | <MRL | 0 | No PFAS detected |
| Beloit City Of | WI1540112 | Beloit | 36,677 | <MRL | <MRL | 0.002 | Hazard Index below its limit |
| Berlin Waterworks | WI4240216 | Berlin | 5,524 | <MRL | <MRL | 0 | No PFAS detected |
| Birds Eye Foods | WI2650399 | Darien | 610 | <MRL | <MRL | 0 | No PFAS detected |
| Black River Falls Waterworks | WI6270244 | Black River Falls | 3,608 | <MRL | <MRL | 0 | Other PFAS detected |
| Bloomer Waterworks | WI6090448 | Bloomer | 3,680 | <MRL | <MRL | 0 | No PFAS detected |
| Bloomfield, Village Of | WI2651469 | Pell Lake | 4,071 | <MRL | <MRL | 0 | No PFAS detected |
| Bloomington Waterworks | WI1220085 | Bloomington | 682 | <MRL | <MRL | 0 | No PFAS detected |
| Brillion Waterworks | WI4080221 | Brillion | 3,262 | <MRL | <MRL | 0 | No PFAS detected |
| Brookfield Water Utility | WI2680253 | Brookfield | 29,070 | <MRL | <MRL | 0.322 | Hazard Index below its limit |
| Brown Deer Waterworks | WI2410556 | Brown Deer | 12,741 | <MRL | <MRL | 0 | No PFAS detected |
| Burlington Waterworks | WI2520177 | Burlington | 11,043 | <MRL | <MRL | 0 | No PFAS detected |
| Cabelas - Richfield | WI2671753 | Richfield | 3,931 | <MRL | <MRL | 0 | No PFAS detected |
| Caledonia Water Utility - Village Of | WI2520184 | Caledonia | 21,819 | <MRL | <MRL | 0 | No PFAS detected |
| Cedarburg L & W Commission | WI2460108 | Cedarburg | 12,500 | <MRL | <MRL | 0 | No PFAS detected |
| Chilton Waterworks | WI4080222 | Chilton | 4,191 | <MRL | <MRL | 0 | No PFAS detected |
| Chippewa Falls Waterworks | WI6090456 | Chippewa Falls | 13,375 | <MRL | <MRL | 0.002 | Hazard Index below its limit |
| Clinton Waterworks | WI1540114 | Clinton | 2,119 | <MRL | <MRL | 0 | No PFAS detected |
| Clintonville Utilities | WI4690391 | Clintonville | 4,635 | <MRL | <MRL | 0 | No PFAS detected |
| Columbus Utilities | WI1110038 | Columbus | 5,173 | <MRL | <MRL | 0 | No PFAS detected |
| Combined Locks Waterworks | WI4450409 | Combined Locks | 3,609 | <MRL | <MRL | 0 | No PFAS detected |
| Concor Tool And Machine Inc | WI8581084 | Hayward | 57 | 8.5 | 6.7 | 0.003 | PFOA 1–3 × its limit |
| Cottage Grove Waterworks | WI1130218 | Cottage Grove | 9,345 | <MRL | <MRL | 0 | No PFAS detected |
| Cross Plains Waterworks | WI1130219 | Cross Plains | 4,100 | <MRL | <MRL | 0 | No PFAS detected |
| Cudahy Waterworks | WI2410169 | Cudahy | 18,659 | <MRL | <MRL | 0 | No PFAS detected |
| Darboy Sanitary Dist 1 | WI4450117 | Appleton | 13,024 | <MRL | <MRL | 0 | No PFAS detected |
| De Pere Waterworks Sa 1 | WI4050453 | De Pere | 25,660 | <MRL | <MRL | 0 | No PFAS detected |
| Deforest Waterworks | WI1130221 | Deforest | 10,500 | <MRL | <MRL | 0 | No PFAS detected |
| Delavan Waterworks | WI2650113 | Delavan | 9,028 | <MRL | <MRL | 0 | No PFAS detected |
| Denmark Waterworks | WI4050351 | Denmark | 2,684 | <MRL | <MRL | 0 | No PFAS detected |
| Dodgeville Waterworks | WI1250079 | Dodgeville | 4,583 | <MRL | <MRL | 0 | No PFAS detected |
| East Troy Waterworks | WI2650123 | East Troy | 5,054 | <MRL | <MRL | 0.002 | Hazard Index below its limit |
| Eau Claire Waterworks | WI6180230 | Eau Claire | 70,587 | <MRL | <MRL | 1.1 | Hazard Index 1–3 × its limit |
| Eau Galle Cheese Factory Llc | WI6470186 | Durand | 50 | <MRL | <MRL | 0 | No PFAS detected |
| Edgerton Waterworks | WI1540119 | Edgerton | 5,512 | <MRL | <MRL | 0 | No PFAS detected |
| Elkhorn Waterworks | WI2650062 | Elkhorn | 10,317 | <MRL | <MRL | 0 | No PFAS detected |
| Ellsworth Waterworks | WI6480239 | Ellsworth | 3,304 | <MRL | <MRL | 0 | Other PFAS detected |
| Evansville Waterworks | WI1540047 | Evansville | 5,703 | <MRL | <MRL | 0 | No PFAS detected |
| Fitchburg Utility Dist 1 | WI1130231 | Fitchburg | 29,900 | <MRL | <MRL | 0 | No PFAS detected |
| Fond Du Lac Waterworks | WI4200469 | Fond Du Lac | 44,678 | <MRL | <MRL | 0 | No PFAS detected |
| Forest Junction Pub Util | WI4080377 | Forest Junction | 487 | <MRL | <MRL | 0 | No PFAS detected |
| Fort Atkinson Waterworks | WI1280103 | Fort Atkinson | 12,390 | <MRL | <MRL | 0 | No PFAS detected |
| Fort Mccoy North Post | WI6420302 | Fort Mccoy | 10,000 | <MRL | <MRL | 0 | No PFAS detected |
| Fox Crossing Utilities East | WI4710453 | Neenah | 10,927 | <MRL | <MRL | 0 | No PFAS detected |
| Fox Crossing Utilities West | WI4710358 | Neenah | 14,000 | <MRL | <MRL | 0 | No PFAS detected |
| Fox Point Waterworks | WI2410584 | Fox Point | 6,808 | <MRL | <MRL | 0 | No PFAS detected |
| Franklin Water Utility | WI2410563 | Franklin | 22,500 | <MRL | <MRL | 0 | No PFAS detected |
| Germantown Water Utility | WI2670105 | Germantown | 20,027 | <MRL | <MRL | 0 | No PFAS detected |
| Glendale Waterworks | WI2410168 | Glendale | 12,883 | <MRL | <MRL | 0 | No PFAS detected |
| Grafton Waterworks | WI2460111 | Grafton | 12,269 | <MRL | <MRL | 0 | No PFAS detected |
| Grand Chute Tn San Dist 1 | WI4450429 | Grand Chute | 21,583 | <MRL | <MRL | 0 | No PFAS detected |
| Green Bay Waterworks | WI4050356 | Green Bay | 107,369 | <MRL | <MRL | 0 | No PFAS detected |
| Greendale Waterworks | WI2410571 | Greendale | 14,393 | <MRL | <MRL | 0 | No PFAS detected |
| Greenville Utilities Vil Of | WI4450278 | Greenville | 11,340 | <MRL | <MRL | 0 | No PFAS detected |
| Harrison Utilities-Fka Waverly Sd | WI4080076 | Menasha | 5,500 | <MRL | <MRL | 0 | Other PFAS detected |
| Hartford Waterworks | WI2670110 | Hartford | 15,805 | 6.8 | 5.5 | 0.61 | PFOA 1–3 × its limit |
| Hartland Waterworks | WI2680205 | Hartland | 9,212 | 4.4 | 4.6 | 0.362 | PFOS 1–3 × its limit |
| Hilbert Waterworks | WI4080269 | Hilbert | 1,176 | <MRL | <MRL | 0 | No PFAS detected |
| Ho Chunk Casino | WI1570639 | Black River Falls | 5,486 | <MRL | <MRL | 0 | No PFAS detected |
| Holmen Waterworks | WI6320306 | Holmen | 10,147 | <MRL | <MRL | 0 | Other PFAS detected |
| Horicon Waterworks | WI1140146 | Horicon | 3,682 | <MRL | <MRL | 0 | No PFAS detected |
| Howard Waterworks | WI4050468 | Green Bay | 21,133 | <MRL | <MRL | 0 | No PFAS detected |
| Hudson Waterworks | WI6560087 | Hudson | 18,558 | <MRL | <MRL | 0 | Other PFAS detected |
| Jackson Waterworks | WI2670111 | Jackson | 8,397 | <MRL | <MRL | 0 | No PFAS detected |
| Janesville Water Utility | WI1540127 | Janesville | 64,415 | <MRL | <MRL | 0 | No PFAS detected |
| Jefferson Waterworks | WI1280104 | Jefferson | 7,926 | <MRL | <MRL | 0 | No PFAS detected |
| Kaukauna Utilities | WI4450336 | Kaukauna | 17,493 | <MRL | <MRL | 0 | No PFAS detected |
| Kenosha Water Utility | WI2300046 | Kenosha | 99,218 | <MRL | <MRL | 0 | No PFAS detected |
| Keshena | 055295508 | Keshena | 3,960 | <MRL | <MRL | 0 | No PFAS detected |
| Kewaskum Waterworks | WI2670112 | Kewaskum | 4,309 | 15 | <MRL | 0.003 | PFOA ≥ 3 × its limit |
| Kiel Waterworks | WI4360427 | Kiel | 3,932 | <MRL | <MRL | 0 | No PFAS detected |
| Kimberly Waterworks | WI4450342 | Kimberly | 7,608 | <MRL | <MRL | 0 | No PFAS detected |
| Kronenwetter Water & Sewer Utility | WI7371700 | Kronenwetter | 6,931 | <MRL | <MRL | 0 | No PFAS detected |
| La Crosse Waterworks | WI6320309 | La Crosse | 53,000 | 5.1 | 5.5 | 0.84 | PFOS 1–3 × its limit |
| Lac Du Flambeau | 055295401 | Lac Du Flambeau | 2,962 | <MRL | <MRL | 0.004 | Hazard Index below its limit |
| Lake Geneva Utility Commission | WI2650066 | Lake Geneva | 7,107 | 4.7 | <MRL | 0.393 | PFOA 1–3 × its limit |
| Lake Hallie Waterworks Village Of | WI6090849 | Chippewa Falls | 6,701 | <MRL | <MRL | 0 | No PFAS detected |
| Lake Mills Waterworks | WI1280108 | Lake Mills | 6,211 | <MRL | <MRL | 0 | No PFAS detected |
| Lancaster Waterworks | WI1220107 | Lancaster | 3,907 | <MRL | <MRL | 0 | No PFAS detected |
| Lawrence Waterworks | WI4051625 | De Pere | 5,398 | <MRL | <MRL | 0 | No PFAS detected |
| Ledgeview Tn Sanitary Dist 2 | WI4051418 | De Pere | 7,602 | <MRL | <MRL | 0 | No PFAS detected |
| Little Chute Waterworks | WI4450338 | Little Chute | 12,168 | <MRL | <MRL | 0 | No PFAS detected |
| Madison Water Utility | WI1130224 | Madison | 272,000 | <MRL | <MRL | 0.73 | Hazard Index below its limit |
| Manitowoc Waterworks | WI4360364 | Manitowoc | 34,500 | <MRL | <MRL | 0 | No PFAS detected |
| Marinette Waterworks | WI4380395 | Marinette | 10,968 | <MRL | <MRL | 0 | No PFAS detected |
| Marshall Waterworks | WI1130237 | Marshall | 3,862 | <MRL | <MRL | 0 | No PFAS detected |
| Marshfield Utilities | WI7720165 | Marshfield | 18,815 | <MRL | 14 | 1.402 | PFOS ≥ 3 × its limit |
| Mauston Green Acres | WI7290134 | Colfax | 40 | <MRL | <MRL | 0 | No PFAS detected |
| Mauston Waterworks | WI7290129 | Mauston | 4,456 | <MRL | <MRL | 0 | No PFAS detected |
| Mayville Waterworks | WI1140057 | Mayville | 5,112 | <MRL | <MRL | 0 | No PFAS detected |
| Mcfarland Waterworks | WI1130241 | Mcfarland | 9,676 | <MRL | <MRL | 0.37 | Hazard Index below its limit |
| Medford Waterworks | WI8610125 | Medford | 4,318 | 4.1 | <MRL | 0.52 | PFOA 1–3 × its limit |
| Menasha Elec & Water Util | WI4710334 | Menasha | 15,144 | <MRL | <MRL | 0 | No PFAS detected |
| Menomonee Falls Ww - Surface Water | WI2680082 | Menomonee Falls | 23,867 | <MRL | <MRL | 0 | No PFAS detected |
| Menomonie Waterworks | WI6170268 | Menomonie | 15,950 | <MRL | <MRL | 0 | No PFAS detected |
| Mequon Water Utility | WI2460112 | Mequon | 11,152 | <MRL | <MRL | 0 | No PFAS detected |
| Merrill Waterworks | WI7350123 | Merrill | 9,661 | <MRL | <MRL | 0 | No PFAS detected |
| Middleton Waterworks | WI1130242 | Middleton | 23,868 | <MRL | <MRL | 0 | No PFAS detected |
| Milton Waterworks | WI1540130 | Milton | 5,588 | <MRL | <MRL | 0 | No PFAS detected |
| Milwaukee Waterworks | WI2410100 | Milwaukee | 626,000 | <MRL | <MRL | 0 | No PFAS detected |
| Monona Waterworks | WI1130245 | Monona | 8,624 | <MRL | <MRL | 0.542 | Hazard Index below its limit |
| Monroe Waterworks | WI1230078 | Monroe | 10,780 | <MRL | <MRL | 0 | No PFAS detected |
| Mt Horeb Waterworks | WI1130247 | Mount Horeb | 7,756 | <MRL | <MRL | 0.33 | Hazard Index below its limit |
| Mt Zion Christian Church | WI2650822 | Lake Geneva | 509 | <MRL | <MRL | 0 | No PFAS detected |
| Mukwonago Waterworks | WI2680209 | Mukwonago | 8,190 | <MRL | <MRL | 0 | No PFAS detected |
| Muskego Water Utility | WI2681741 | Muskego | 8,150 | <MRL | <MRL | 0 | No PFAS detected |
| Neenah Waterworks | WI4710348 | Neenah | 27,506 | <MRL | <MRL | 0 | No PFAS detected |
| New Berlin Water Utility | WI2680217 | New Berlin | 27,899 | <MRL | <MRL | 0 | No PFAS detected |
| New Berlin West Middle High School | WI2680813 | New Berlin | 1,380 | <MRL | <MRL | 0 | No PFAS detected |
| New London Waterworks | WI4690398 | New London | 7,187 | <MRL | <MRL | 0 | Other PFAS detected |
| New Richmond Waterworks | WI6560126 | New Richmond | 10,824 | <MRL | <MRL | 0 | Other PFAS detected |
| North Fond Du Lac Waterworks | WI4200405 | North Fond Du Lac | 5,414 | <MRL | <MRL | 0 | No PFAS detected |
| North Shore Water Commission | WI2413515 | Milwaukee | 35,598 | <MRL | <MRL | 0 | No PFAS detected |
| Oak Creek Waterworks | WI2410172 | Oak Creek | 32,104 | <MRL | <MRL | 0 | No PFAS detected |
| Oconomowoc Waterworks | WI2680227 | Oconomowoc | 15,805 | <MRL | <MRL | 0.002 | Hazard Index below its limit |
| Oconto Waterworks | WI4430495 | Oconto | 4,583 | <MRL | <MRL | 0 | No PFAS detected |
| Omro Waterworks | WI4710357 | Omro | 3,629 | <MRL | <MRL | 0 | No PFAS detected |
| Onalaska Waterworks | WI6320327 | Onalaska | 18,000 | <MRL | <MRL | 0.002 | Hazard Index below its limit |
| Oneida #1 Or Site #1 | 055295703 | Oneida | 4,393 | <MRL | <MRL | 0 | No PFAS detected |
| Oregon Waterworks | WI1130251 | Oregon | 11,200 | <MRL | <MRL | 0 | No PFAS detected |
| Oshkosh Waterworks | WI4710457 | Oshkosh | 63,000 | <MRL | <MRL | 0 | No PFAS detected |
| Palmyra Waterworks | WI1280112 | Palmyra | 1,756 | <MRL | 6.2 | 0.32 | PFOS 1–3 × its limit |
| Peshtigo Waterworks | WI4380442 | Peshtigo | 3,420 | <MRL | <MRL | 0 | No PFAS detected |
| Pewaukee City Water And Sewer Utility | WI2680214 | Pewaukee | 8,671 | 8.5 | 12 | 6.913 | Hazard Index ≥ 3 × its limit |
| Pewaukee Village Waterworks | WI2680229 | Pewaukee | 8,166 | <MRL | <MRL | 0 | Other PFAS detected |
| Pikes Bay Marina | WI8040687 | Bayfield | 45 | <MRL | <MRL | 0 | No PFAS detected |
| Platteville Waterworks | WI1220115 | Platteville | 12,268 | <MRL | <MRL | 0 | No PFAS detected |
| Pleasant Prairie Water Utility | WI2300167 | Pleasant Prairie | 10,754 | <MRL | <MRL | 0 | No PFAS detected |
| Plover Waterworks | WI7500726 | Plover | 13,486 | <MRL | <MRL | 0 | Other PFAS detected |
| Plymouth Utilities | WI4600446 | Plymouth | 8,964 | <MRL | <MRL | 0 | No PFAS detected |
| Port Washington Waterworks | WI2460054 | Port Washington | 12,853 | <MRL | <MRL | 0 | No PFAS detected |
| Portage Waterworks | WI1110039 | Portage | 10,437 | <MRL | <MRL | 0.81 | Hazard Index below its limit |
| Prairie Du Chien Waterworks | WI6120250 | Prairie Du Chien | 6,005 | <MRL | 39 | 1.1 | PFOS ≥ 3 × its limit |
| Prairie Du Sac Waterworks | WI1570100 | Prairie Du Sac | 4,006 | <MRL | <MRL | 0 | No PFAS detected |
| Prescott Waterworks | WI6480243 | Prescott | 4,258 | 9.9 | <MRL | 1.802 | PFOA 1–3 × its limit |
| Pulaski Waterworks | WI4050355 | Pulaski | 4,040 | <MRL | <MRL | 0 | No PFAS detected |
| Racine Waterworks | WI2520062 | Racine | 105,100 | <MRL | <MRL | 0 | No PFAS detected |
| Reedsburg Waterworks | WI1570102 | Reedsburg | 9,984 | <MRL | <MRL | 0.44 | Hazard Index below its limit |
| Rhinelander Water & Wastewater | WI7440126 | Rhinelander | 8,234 | 6.8 | <MRL | 0 | PFOA 1–3 × its limit |
| Rib Mountain Water Utility | WI7370660 | Wausau | 6,398 | 5.2 | 9.4 | 0.922 | PFOS 1–3 × its limit |
| Rice Lake Waterworks | WI6030138 | Rice Lake | 9,012 | <MRL | <MRL | 0 | No PFAS detected |
| Richland Center Waterworks | WI1530068 | Richland Center | 5,100 | <MRL | <MRL | 0 | No PFAS detected |
| Ripon Water Utility | WI4200476 | Ripon | 7,716 | <MRL | <MRL | 0 | No PFAS detected |
| River Falls Waterworks | WI6480246 | River Falls | 16,000 | <MRL | <MRL | 0 | No PFAS detected |
| Sauk City Waterworks | WI1570105 | Sauk City | 3,518 | <MRL | <MRL | 0 | No PFAS detected |
| Saukville Waterworks | WI2460134 | Saukville | 4,268 | 4.2 | 31 | 7.314 | PFOS ≥ 3 × its limit |
| Schofield Waterworks | WI7370162 | Schofield | 2,205 | 4.7 | <MRL | 0.625 | PFOA 1–3 × its limit |
| Schreiber Foods Inc | WI2670302 | West Bend | 260 | <MRL | <MRL | 0 | No PFAS detected |
| Seymour Waterworks | WI4450337 | Seymour | 3,601 | <MRL | <MRL | 0 | No PFAS detected |
| Shawano Lk San Dist 1 | WI4590457 | Shawano | 4,950 | <MRL | <MRL | 0 | Other PFAS detected |
| Shawano Waterworks | WI4590456 | Shawano | 9,610 | <MRL | <MRL | 0 | No PFAS detected |
| Sheboygan Falls Utilities | WI4600455 | Sheboygan Falls | 8,687 | <MRL | <MRL | 0 | No PFAS detected |
| Sheboygan Tn Waterworks | WI4600403 | Sheboygan | 4,596 | <MRL | <MRL | 1.202 | Hazard Index 1–3 × its limit |
| Sheboygan Water Utilities | WI4600354 | Sheboygan | 49,931 | <MRL | <MRL | 0 | No PFAS detected |
| Shorewood Waterworks | WI2410607 | Shorewood | 13,535 | <MRL | <MRL | 0 | No PFAS detected |
| Shullsburg Waterworks | WI1330076 | Shullsburg | 1,222 | <MRL | <MRL | 0 | No PFAS detected |
| Slinger Water Utility | WI2670116 | Slinger | 5,659 | <MRL | <MRL | 0.57 | Hazard Index below its limit |
| Somers Water Utility | WI2301421 | Somers | 1,930 | <MRL | <MRL | 0 | No PFAS detected |
| South Milwaukee Waterworks | WI2410144 | South Milwaukee | 21,340 | <MRL | <MRL | 0 | No PFAS detected |
| South-Central Water System | 055295003 | Bowler | 2,805 | <MRL | <MRL | 0 | No PFAS detected |
| Sparta Waterworks | WI6420297 | Sparta | 10,025 | <MRL | <MRL | 0 | No PFAS detected |
| St Edward Sch & Ch | WI4450623 | Appleton | 505 | <MRL | <MRL | 0 | No PFAS detected |
| Stanley Waterworks | WI6090462 | Stanley | 3,500 | <MRL | <MRL | 0 | No PFAS detected |
| Stevens Point Waterworks | WI7500141 | Stevens Point | 26,717 | <MRL | <MRL | 0 | No PFAS detected |
| Stoughton Waterworks | WI1130078 | Stoughton | 13,078 | <MRL | <MRL | 0.36 | Hazard Index below its limit |
| Sturgeon Bay Waterworks | WI4150526 | Sturgeon Bay | 9,700 | <MRL | 4.2 | 1.3 | Hazard Index 1–3 × its limit |
| Suamico Waterworks | WI4051031 | Suamico | 4,697 | <MRL | <MRL | 0 | No PFAS detected |
| Sun Prairie Utilities | WI1130258 | Sun Prairie | 39,300 | <MRL | <MRL | 0 | No PFAS detected |
| Superior Water Light & Power Company | WI8160147 | Superior | 26,084 | <MRL | <MRL | 0 | No PFAS detected |
| Sussex Village Hall & Water Utility | WI2680233 | Sussex | 11,750 | <MRL | <MRL | 0 | No PFAS detected |
| Tomah Waterworks | WI6420254 | Tomah | 9,192 | <MRL | <MRL | 0.57 | Hazard Index below its limit |
| Tomahawk Waterworks | WI7350127 | Tomahawk | 3,180 | 21 | <MRL | 0 | PFOA ≥ 3 × its limit |
| Town Of Brookfield San Dist 4 | WI2680239 | Brookfield | 6,419 | <MRL | <MRL | 0.004 | Hazard Index below its limit |
| Two Rivers Waterworks | WI4360436 | Two Rivers | 11,270 | <MRL | <MRL | 0 | No PFAS detected |
| Union Grove Waterworks | WI2520200 | Union Grove | 4,900 | <MRL | <MRL | 0 | No PFAS detected |
| Verona Waterworks | WI1130259 | Verona | 14,030 | <MRL | <MRL | 0.002 | Hazard Index below its limit |
| Viroqua Waterworks | WI6630263 | Viroqua | 4,362 | <MRL | <MRL | 0 | No PFAS detected |
| Waterford Waterworks | WI2520202 | Waterford | 5,368 | <MRL | <MRL | 0 | No PFAS detected |
| Waterloo Waterworks | WI1280115 | Waterloo | 3,520 | <MRL | <MRL | 0 | No PFAS detected |
| Watertown Waterworks | WI1280044 | Watertown | 23,945 | <MRL | <MRL | 0 | No PFAS detected |
| Waukesha Water Utility | WI2680238 | Waukesha | 70,718 | <MRL | <MRL | 0 | No PFAS detected |
| Waunakee Waterworks | WI1130265 | Waunakee | 14,879 | <MRL | <MRL | 0 | No PFAS detected |
| Waupaca Waterworks | WI4690402 | Waupaca | 6,062 | <MRL | 4.3 | 0.004 | PFOS 1–3 × its limit |
| Waupun Correctional Inst | WI1140142 | Madison | 3,706 | <MRL | <MRL | 0 | No PFAS detected |
| Waupun Utilities | WI1140131 | Waupun | 8,056 | <MRL | <MRL | 0 | No PFAS detected |
| Wausau Waterworks | WI7370102 | Wausau | 39,994 | <MRL | <MRL | 0 | Other PFAS detected |
| Wauwatosa Waterworks | WI2410596 | Wauwatosa | 49,064 | <MRL | <MRL | 0 | No PFAS detected |
| West Allis Waterworks | WI2410595 | West Allis | 63,240 | <MRL | <MRL | 0 | No PFAS detected |
| West Bend Waterworks | WI2670120 | West Bend | 32,149 | 6.5 | <MRL | 0.002 | PFOA 1–3 × its limit |
| West Salem Waterworks | WI6320334 | West Salem | 5,045 | <MRL | <MRL | 0 | No PFAS detected |
| Weston Municipal Utilities | WI7370163 | Weston | 16,000 | 5.9 | 13 | 0.585 | PFOS ≥ 3 × its limit |
| Whitefish Bay Waterworks | WI2410597 | Milwaukee | 14,272 | <MRL | <MRL | 0 | No PFAS detected |
| Whitewater Waterworks | WI2650056 | Whitewater | 14,000 | <MRL | <MRL | 0 | No PFAS detected |
| Wis Rapids Water Works & Lighting Comm | WI7720108 | Wisconsin Rapids | 20,000 | <MRL | <MRL | 0 | No PFAS detected |
| Yorkville Utility Dist 1 | WI2521735 | Union Grove | 3,900 | <MRL | <MRL | 0 | No PFAS detected |
Not tested under UCMR 5 (1,730)
UCMR 5 required monitoring by systems serving 3,300 or more people and by a representative sample of smaller systems. The systems below have no UCMR 5 results in EPA's data. Not tested is not the same as not detected: the absence of results says nothing about PFAS in their water.
| System | PWSID | Type | City | Population | Counties |
|---|---|---|---|---|---|
| 12700 Bluemound Road Llc | WI2680825 | NTNCWS | Elm Grove | 150 | Waukesha County |
| 13000 W Bluemound Building | WI2681884 | NTNCWS | Port Charlotte | 25 | Waukesha County |
| 2Yk Llc | WI7370123 | CWS | Antigo | 25 | Marathon County |
| 337-9 Holy Hill Apartments Llc | WI2300159 | CWS | Libertyville | 30 | Kenosha County |
| 3M Co Greystone Plant | WI7370691 | NTNCWS | Wausau | 52 | Marathon County |
| 425 Holy Hill Apts | WI2300163 | CWS | Lake Villa | 28 | Kenosha County |
| 440 Wells St | WI2686978 | NTNCWS | Delafield | 45 | Waukesha County |
| 524 Milwaukee St | WI2686979 | NTNCWS | Delafield | 45 | Waukesha County |
| 52Nd Ave Water Group | WI2301565 | CWS | Kenosha | 35 | Kenosha County |
| 705 Genesee Street | WI2686970 | NTNCWS | Delafield | 60 | Waukesha County |
| 803 Genesee St | WI2685831 | NTNCWS | Delafield | 115 | Waukesha County |
| Abbotsford Waterworks | WI7370148 | CWS | Abbotsford | 2,502 | Clark County, Marathon County |
| Abrams Elementary School | WI4430588 | NTNCWS | Oconto Falls | 400 | Oconto County |
| Abundant Life Apostolic Church | WI2684972 | NTNCWS | Oconomowoc | 543 | Waukesha County |
| Abundant Life Church | WI6560473 | NTNCWS | River Falls | 110 | St. Croix County |
| Acton Academy Main | WI4712108 | NTNCWS | Oshkosh | 64 | Winnebago County |
| Acton Academy Spark Land | WI4712110 | NTNCWS | Oshkosh | 50 | Winnebago County |
| Actus Nutrition Fond Du Lac | WI4200737 | NTNCWS | Fond Du Lac | 177 | Fond du Lac County |
| Adams Waterworks | WI7010107 | CWS | Adams | 1,847 | Adams County |
| Addison Elementary School | WI2670496 | NTNCWS | Slinger | 515 | Washington County |
| Adell Waterworks | WI4600435 | CWS | Adell | 510 | Sheboygan County |
| Advanced Disposal Beloit | WI1541686 | NTNCWS | Beloit | 60 | Rock County |
| Advanced Manufacturing Tech Ctr | WI4711940 | NTNCWS | Appleton | 150 | Winnebago County |
| Advocap Inc Headstart | WI4240120 | NTNCWS | Fond Du Lac | 75 | Green Lake County |
| Agropur Inc | WI4310133 | NTNCWS | Appleton | 180 | Kewaunee County |
| Airpro | WI7440947 | NTNCWS | Rhinelander | 56 | Oneida County |
| Albany Waterworks | WI1230071 | CWS | Albany | 1,018 | Green County |
| Alberta Subdivision | WI2460141 | CWS | Thiensville | 75 | Ozaukee County |
| Aldrich Chemical Co | WI4600278 | NTNCWS | Sheboygan Falls | 400 | Sheboygan County |
| Algoma Tn Sanitary Dist 1 | WI4711611 | CWS | Oshkosh | 3,935 | Winnebago County |
| Algoma Waterworks | WI4310280 | CWS | Algoma | 3,219 | Kewaunee County |
| Alleluia Lutheran Ch | WI4052329 | NTNCWS | Greenleaf | 59 | Brown County |
| Allen Estates Llc | WI4430506 | CWS | Oak Creek | 75 | Oconto County |
| Allenton Sanitary District | WI2670104 | CWS | Allenton | 860 | Washington County |
| Alliant Columbia Energy Center | WI1110214 | NTNCWS | Pardeeville | 195 | Columbia County |
| Alliant Energy & Wp&L Co Maintenance | WI1540188 | NTNCWS | Madison | 180 | Rock County |
| Allied Plastics Inc | WI2301674 | NTNCWS | Twin Lakes | 80 | Kenosha County |
| Allstate Peterbilt Group | WI6181127 | NTNCWS | St Louis Park | 65 | Eau Claire County |
| Alma Center Waterworks | WI6270298 | CWS | Alma Center | 487 | Jackson County |
| Alma Public School | WI6060333 | NTNCWS | Alma | 316 | Buffalo County |
| Alma Waterworks | WI6060192 | CWS | Alma | 769 | Buffalo County |
| Almena Waterworks | WI6030124 | CWS | Almena | 705 | Barron County |
| Almond-Bancroft Public Schools | WI7500260 | NTNCWS | Almond | 420 | Portage County |
| Alphorn Ford Inc | WI1230125 | NTNCWS | Monroe | 45 | Green County |
| Alpine Valley Resort | WI2650160 | NTNCWS | East Troy | 550 | Walworth County |
| Alsum Farms & Produce Inc Drinking Water System | WI1110826 | NTNCWS | Friesland | 145 | Columbia County |
| Amani Village Sanitary Dist | WI6490342 | CWS | Osceola | 100 | Polk County |
| Amer Baptist Assem Main | WI4240242 | NTNCWS | Green Lake | 640 | Green Lake County |
| American Champion Aircraft | WI2521356 | NTNCWS | Rochester | 60 | Racine County |
| American Transmission Company | WI1132065 | NTNCWS | Cottage Grove | 70 | Dane County, Waukesha County |
| Americold Logistics | WI2651179 | NTNCWS | Darien | 170 | Walworth County |
| Amery Waterworks | WI6490328 | CWS | Amery | 2,962 | Polk County |
| Amherst Waterworks | WI7500094 | CWS | Amherst | 1,119 | Portage County |
| Amity School | WI4200697 | NTNCWS | Waupun | 25 | Fond du Lac County |
| Amorim Cork Composites | WI2300227 | NTNCWS | Trevor | 100 | Kenosha County |
| Ampi Jim Falls | WI6090706 | NTNCWS | Jim Falls | 150 | Chippewa County |
| Amy Belle School | WI2670419 | NTNCWS | Germantown | 522 | Washington County |
| Andersons Trailer Court | WI6030140 | CWS | Cameron | 95 | Barron County |
| Andys Meats Inc | WI4390169 | NTNCWS | Chicago | 43 | Marquette County |
| Angels Grace Hospice | WI2686091 | NTNCWS | Oconomowoc | 90 | Waukesha County |
| Annas House | WI4051141 | CWS | New Franken | 32 | Brown County, Door County, Kewaunee County |
| Anthony Acres School | WI6180308 | NTNCWS | Mondovi | 85 | Eau Claire County |
| Apartments Of Stoneridge | WI2682761 | CWS | Pewaukee | 75 | Waukesha County |
| Apollo Tool Inc | WI4390659 | NTNCWS | Westfield | 37 | Marquette County |
| Apple Ridge Academy - Pewaukee | WI2685744 | NTNCWS | New Berlin | 150 | Waukesha County |
| Applewood Hill | WI1130244 | CWS | Madison | 125 | Dane County |
| Aquamaster | WI4361338 | NTNCWS | Kiel | 45 | Manitowoc County |
| Arbor View Assisted Living 1 | WI2522802 | NTNCWS | Burlington | 35 | Racine County |
| Arbor View Assisted Living 2 | WI2522803 | NTNCWS | Burlington | 35 | Racine County |
| Arbor Vitae Woodruff El Sch | WI7641577 | NTNCWS | Woodruff | 575 | Vilas County |
| Arbors | WI2682795 | CWS | Delafield | 280 | Waukesha County |
| Arcadia Waterworks | WI6620319 | CWS | Arcadia | 3,737 | Trempealeau County |
| Argyle Waterworks | WI1330068 | CWS | Argyle | 823 | Lafayette County |
| Arlington Waterworks | WI1110093 | CWS | Arlington | 946 | Columbia County |
| Ashland Ford Chrysler | WI8040443 | NTNCWS | Ashland | 50 | Bayfield County |
| Ashley Yorkville Llc - Main Building East | WI2521200 | NTNCWS | Chicago | 30 | Racine County |
| Ashley Yorkville Llc - Main Building West | WI2522470 | NTNCWS | Chicago | 50 | Racine County |
| Ashwood Grove Edgewater | WI4200485 | CWS | Fond Du Lac | 1,046 | Fond du Lac County |
| Aspen Ridge | WI8020382 | CWS | Highbridge | 50 | Ashland County |
| Ataco Steel Shop | WI2460950 | NTNCWS | Cedarburg | 120 | Ozaukee County |
| Athens Waterworks | WI7370149 | CWS | Athens | 1,025 | Marathon County |
| Auburndale Elementary School | WI7720431 | NTNCWS | Auburndale | 485 | Wood County |
| Auburndale High School | WI7720429 | NTNCWS | Auburndale | 498 | Wood County |
| Augusta Mennonite Church & School | WI6180258 | NTNCWS | Thorp | 38 | Eau Claire County |
| Augusta Waterworks | WI6180231 | CWS | Augusta | 1,450 | Eau Claire County |
| Autumn Fields | WI4310103 | NTNCWS | Suamico | 53 | Kewaunee County |
| Autumn Ridge Water System Llc | WI1281138 | CWS | Ixonia | 575 | Jefferson County |
| Ave Maria Academy | WI6480262 | NTNCWS | Plum City | 226 | Pierce County |
| Avoca Waterworks | WI1250074 | CWS | Avoca | 545 | Iowa County |
| Aztalan Bio | WI1281263 | NTNCWS | Johnson Creek | 99 | Jefferson County |
| B & B Metals Office | WI4360119 | NTNCWS | Newton | 62 | Manitowoc County |
| B&D Calf Facility | WI4380541 | NTNCWS | Pound | 25 | Marinette County |
| B&D Parlor Facility | WI4380497 | NTNCWS | Pound | 25 | Marinette County |
| Babes In Toyland Childcare | WI6181044 | NTNCWS | Jim Falls | 25 | Eau Claire County |
| Badger Mining Corp Taylor Office | WI6270463 | NTNCWS | Berlin | 56 | Jackson County |
| Badger Mining Fairwater Office | WI4240421 | NTNCWS | Berlin | 26 | Green Lake County |
| Badger Mining Hixton Mine Office | WI6270266 | NTNCWS | Berlin | 26 | Jackson County |
| Baer Manufacturing | WI6560112 | NTNCWS | Bloomington | 60 | St. Croix County |
| Baer Manufacturing #2 | WI6561273 | NTNCWS | Bloomington | 50 | St. Croix County |
| Bagley Waterworks | WI1220084 | CWS | Bagley | 353 | Grant County |
| Bains Country Estates Mhp | WI4600454 | CWS | Sheboygan Falls | 200 | Sheboygan County |
| Baldwin Christian School | WI6560205 | NTNCWS | Baldwin | 137 | St. Croix County |
| Balsam Lake Waterworks | WI6490330 | CWS | Balsam Lake | 1,031 | Polk County |
| Baltic Rentals Llc | WI7640083 | CWS | Marshfield | 75 | Vilas County |
| Bangor Waterworks | WI6320233 | CWS | Bangor | 1,520 | La Crosse County |
| Barneveld Waterworks | WI1250075 | CWS | Barneveld | 1,258 | Iowa County |
| Battlestone Station Condos | WI6321133 | CWS | La Crosse | 40 | La Crosse County |
| Bay City Waterworks | WI6480153 | CWS | Bay City | 499 | Pierce County |
| Bay View Heights Inc | WI1130253 | CWS | Orem | 450 | Dane County |
| Bayfield Waterworks | WI8040126 | CWS | Bayfield | 488 | Bayfield County |
| Bear Creek Waterworks | WI4450867 | CWS | Bear Creek | 418 | Outagamie County |
| Beaver Brook Sanitary District | WI8660734 | CWS | Spooner | 200 | Washburn County |
| Beaver Dam North Water Distribution System | WI1141143 | NTNCWS | Beaver Dam | 550 | Dodge County |
| Beecher-Dunbar-Pembine School | WI4380692 | NTNCWS | Pembine | 292 | Marinette County |
| Beechwood Farms Estates | WI2460791 | CWS | Milwaukee | 300 | Ozaukee County |
| Bel Mar Offices I & Ii | WI2460925 | NTNCWS | Mequon | 99 | Ozaukee County |
| Belgioioso Chase Well 5 | WI4430316 | NTNCWS | Green Bay | 25 | Oconto County |
| Belgioioso Chase Well 6 | WI4430280 | NTNCWS | Green Bay | 27 | Oconto County |
| Belgioioso Glenmore | WI4050899 | NTNCWS | Green Bay | 82 | Brown County |
| Belgioioso New Denmark | WI4052447 | NTNCWS | Green Bay | 120 | Brown County |
| Belgium Waterworks | WI2460107 | CWS | Belgium | 2,493 | Ozaukee County |
| Belleville Waterworks | WI1130209 | CWS | Belleville | 2,712 | Dane County, Green County |
| Belmont Waterworks | WI1330069 | CWS | Belmont | 989 | Lafayette County |
| Benton Waterworks | WI1330070 | CWS | Benton | 976 | Lafayette County |
| Berghs Mobile Home Park | WI6180299 | CWS | Colfax | 60 | Dunn County, Eau Claire County |
| Berkots | WI2301184 | NTNCWS | Twin Lakes | 340 | Kenosha County |
| Bernatellos Food | WI7501155 | NTNCWS | Waupaca | 100 | Portage County |
| Berry Ridge Estates | WI7010592 | CWS | Nyack | 60 | Adams County |
| Bethel Highlands Lutheran Church | WI6561023 | NTNCWS | Hudson | 120 | St. Croix County |
| Bethlehem Lutheran Church & Preschool | WI2680609 | NTNCWS | Wales | 188 | Waukesha County |
| Bible Baptist Church Of Utica | WI1130735 | NTNCWS | Stoughton | 166 | Dane County |
| Biddick Inc | WI1220151 | NTNCWS | Livingston | 75 | Grant County |
| Big Bend Elementary School | WI2680668 | NTNCWS | Mukwonago | 507 | Waukesha County |
| Big Musky Resort | WI8581273 | CWS | Colfax | 25 | Sawyer County |
| Big River Resources Boyceville Llc | WI6170172 | NTNCWS | West Burlington | 37 | Dunn County |
| Birch Hill | 055295103 | CWS | Odanah | 322 | Ashland County |
| Birch Terrace Mobile Home Community | WI6170270 | CWS | Farmington Hills | 700 | Dunn County |
| Birchwood Trailer Court | WI1540770 | CWS | Evansville | 32 | Rock County |
| Birchwood Waterworks | WI8660302 | CWS | Birchwood | 442 | Sawyer County, Washburn County |
| Birnamwood Waterworks | WI4590449 | CWS | Birnamwood | 832 | Shawano County |
| Biron Water Utility | WI7720171 | CWS | Wisconsin Rapids | 879 | Wood County |
| Bison Transport Usa | WI7500582 | NTNCWS | Amherst | 75 | Portage County |
| Bit O Green Llc Mhp | WI1250207 | CWS | Spring Green | 49 | Iowa County |
| Black Creek Waterworks | WI4450408 | CWS | Black Creek | 1,336 | Outagamie County |
| Black Earth Waterworks | WI1130211 | CWS | Black Earth | 1,493 | Dane County |
| Black River Correctional Center | WI6270287 | CWS | Black River Falls | 163 | Jackson County |
| Blackhawk Corporate Center | WI2522228 | NTNCWS | Franksville | 202 | Racine County |
| Blackwell Civilian Consvtn Ctr | WI7210112 | CWS | Laona | 190 | Forest County |
| Blackwell Community | 055295207 | CWS | Crandon | 39 | |
| Blair Waterworks | WI6620274 | CWS | Blair | 1,280 | Trempealeau County |
| Blanchardville Waterworks | WI1330071 | CWS | Blanchardville | 810 | Iowa County, Lafayette County |
| Blooming Grove Montessori | WI1134552 | NTNCWS | Madison | 55 | Dane County |
| Blue Mounds Waterworks | WI1130023 | CWS | Blue Mounds | 950 | Dane County |
| Blue River Waterworks | WI1220087 | CWS | Blue River | 424 | Grant County |
| Blue Spruce Mobile Home Community | WI6270289 | CWS | Westby | 80 | Jackson County |
| Bluffside Court | WI1220090 | CWS | Cassville | 40 | Grant County |
| Bluffview Commons | WI6320315 | CWS | Bangor | 140 | La Crosse County |
| Bluffview Sanitary District | WI1570097 | CWS | Prairie Du Sac | 450 | Sauk County |
| Boardwalk Mhc | WI4690405 | CWS | Irvine | 71 | Waupaca County |
| Boardwalk Mhc Llc | WI7370540 | CWS | Marshfield | 130 | Marathon County |
| Bonduel Waterworks | WI4590450 | CWS | Bonduel | 1,475 | Shawano County |
| Bonnie Vale Park 1 | WI6180287 | CWS | Chippewa Falls | 70 | Eau Claire County |
| Bonnie Vale Park 2 | WI6180300 | CWS | Chippewa Falls | 51 | Eau Claire County |
| Boscobel Waterworks | WI1220089 | CWS | Boscobel | 3,237 | Grant County |
| Bostwick Valley Mhp | WI6320336 | CWS | West Salem | 240 | La Crosse County |
| Bowler Waterworks | WI4590451 | CWS | Bowler | 357 | Shawano County |
| Boyceville Waterworks | WI6170260 | CWS | Boyceville | 1,043 | Dunn County |
| Boyd Waterworks | WI6090449 | CWS | Boyd | 540 | Chippewa County |
| Brakebush Bros Inc | WI4390416 | NTNCWS | Westfield | 898 | Marquette County |
| Brandon Waterworks | WI4200402 | CWS | Brandon | 872 | Fond du Lac County |
| Brandybrook Subdivision | WI2682639 | CWS | Wales | 474 | Waukesha County |
| Breezy Knoll Community | WI1280120 | CWS | Cedaredge | 116 | Jefferson County |
| Breezy Point Mhp 1 | WI1140147 | CWS | Pardeeville | 30 | Dodge County |
| Breezy Point Mhp 2 | WI1140162 | CWS | Pardeeville | 51 | Dodge County |
| Bremer Manufacturing | WI4080353 | NTNCWS | Elkhart Lake | 85 | Calumet County |
| Bridge For Community Life - Brakke | WI6561220 | NTNCWS | Hudson | 70 | St. Croix County |
| Bridgeport San Dist No 1 | WI6120331 | CWS | Prairie Du Chien | 300 | Crawford County |
| Brighton 1 School District | WI2301064 | NTNCWS | Kansasville | 175 | Kenosha County |
| Brighton Ridge Subdivision | WI2460973 | CWS | Mequon | 200 | Ozaukee County |
| Bristol Heights Mhp | WI2300106 | CWS | Racine | 27 | Kenosha County |
| Bristol Village Of East | WI2300767 | CWS | Bristol | 1,001 | Kenosha County |
| Bristol Waterworks Village Of | WI2300050 | CWS | Bristol | 598 | Kenosha County |
| Brockway Sanitary Dist 1 | WI6270299 | CWS | Black River Falls | 2,692 | Jackson County |
| Brodhead Waterworks | WI1230072 | CWS | Brodhead | 3,216 | Green County |
| Brooklyn Waterworks | WI1230075 | CWS | Brooklyn | 1,524 | Dane County, Green County |
| Brookside Meadows Mhp | WI2671738 | CWS | Northbrook | 250 | Washington County |
| Brookwood High School | WI6630345 | NTNCWS | Ontario | 700 | Monroe County |
| Browns Lake Mobile Home Ct | WI2520175 | CWS | Oak Creek | 225 | Racine County |
| Brownsville Waterworks | WI1140139 | CWS | Browsville | 630 | Dodge County |
| Browntown Foundry Llc | WI1230126 | NTNCWS | Browntown | 200 | Green County |
| Browntown Waterworks | WI1230077 | CWS | Browntown | 256 | Green County |
| Bruce Waterworks | WI8550127 | CWS | Bruce | 620 | Rusk County |
| Bryant Products Inc | WI1281101 | NTNCWS | Ixonia | 37 | Jefferson County |
| Buechel Stone Cmf | WI4080005 | NTNCWS | Chilton | 57 | Calumet County |
| Building Blocks Childcare Center | WI4430157 | NTNCWS | Sobieski | 70 | Oconto County |
| Buliks Mobile Home Park | WI8660306 | CWS | Spooner | 93 | Washburn County |
| Burger King Westfield | WI4390626 | NTNCWS | Sun Prairie | 535 | Marquette County |
| Burlington Northern Santa Fe Taconite Facility | WI8160121 | NTNCWS | Superior | 97 | Douglas County |
| Burnett County Government Center | WI8070139 | NTNCWS | Siren | 250 | Burnett County |
| Burnett County Public Safety Facility | WI8070280 | NTNCWS | Siren | 250 | Burnett County |
| Burnett Dairy Coop | WI8070278 | NTNCWS | Grantsburg | 110 | Burnett County |
| Butler Waterworks | WI2680191 | CWS | Butler | 2,181 | Waukesha County |
| Butternut Waterworks | WI8020375 | CWS | Butternut | 283 | Ashland County |
| Cadott Waterworks | WI6090450 | CWS | Cadott | 1,352 | Chippewa County |
| Cady Cheese Factory & Shoppe Llc | WI6560090 | NTNCWS | Wilson | 50 | St. Croix County |
| Caledonia Village Hall | WI2520315 | NTNCWS | Caledonia | 40 | Racine County |
| Calf Source Llc | WI4052070 | NTNCWS | Kaukauna | 50 | Brown County |
| Calvary Christian School | WI6170720 | NTNCWS | Boyceville | 25 | Dunn County |
| Cambria Waterworks | WI1110041 | CWS | Cambria | 767 | Columbia County |
| Cambridge Place Of Delafield | WI2686325 | CWS | Oconomowoc | 50 | Waukesha County |
| Cambridge Water & Sewer Utility | WI1130074 | CWS | Cambridge | 1,638 | Dane County |
| Cameron Waterworks | WI6030127 | CWS | Cameron | 1,787 | Barron County |
| Camp Deep Lake Llc | WI7010113 | CWS | Linconwood | 75 | Adams County |
| Camp Douglas Waterworks | WI7290121 | CWS | Camp Douglas | 640 | Juneau County |
| Camp Forest Springs James Lake And Forest Lake Apts | WI8610020 | CWS | Westboro | 79 | Burnett County, Taylor County |
| Camp Forest Springs Neale Lodge & Main Camp | WI8610165 | NTNCWS | Westboro | 495 | Taylor County |
| Campbellsport Waterworks | WI4200461 | CWS | Campbellsport | 1,825 | Fond du Lac County |
| Canoe Villa Mhc | WI6030128 | CWS | La Crosse | 50 | Barron County |
| Capital Hill Mobile Home Park | WI1110107 | CWS | Lodi | 36 | Columbia County |
| Caravilla Education And Rehab Center | WI1540111 | CWS | Janesville | 298 | Rock County |
| Carebare Daycare | WI6491050 | NTNCWS | Osceola | 60 | Polk County |
| Carefree Estates Mhp | WI2300903 | CWS | Pleasant Prairie | 300 | Kenosha County |
| Carew Concrete & Supply Co Inc Plant 1 | WI4451313 | NTNCWS | Appleton | 37 | Outagamie County |
| Carlton Heights Mhp Ct 2 | WI4151196 | CWS | Sevierville | 60 | Door County |
| Carmeuse Lime & Stone Manitowoc Operation | WI4360651 | NTNCWS | Manitowoc | 29 | Manitowoc County |
| Carriage Hills Condominiums | WI2682406 | CWS | Brookfield | 50 | Waukesha County |
| Carter Community | 055295205 | CWS | Crandon | 634 | Oconto County |
| Cascade Waterworks | WI4600436 | CWS | Cascade | 719 | Sheboygan County |
| Casco Career Academy | WI4310408 | NTNCWS | Casco | 60 | Kewaunee County |
| Cashton Waterworks | WI6420294 | CWS | Cashton | 1,120 | Monroe County |
| Cassville Waterworks | WI1220091 | CWS | Cassville | 777 | Grant County |
| Cazenovia Waterworks | WI1530060 | CWS | Cazenovia | 351 | Richland County |
| Cedar Falls Acres Mhp | WI6170271 | CWS | Colfax | 95 | Dunn County |
| Cedar Grove Waterworks | WI4600437 | CWS | Cedar Grove | 2,213 | Sheboygan County |
| Cedar Junction | WI7720139 | CWS | Grafton | 45 | Wood County |
| Cedar Lake Home 5 | WI2670123 | CWS | West Bend | 330 | Washington County |
| Cedar Lake Home 9 | WI2670063 | CWS | West Bend | 206 | Washington County |
| Cedar Valley Cheese | WI2460056 | NTNCWS | Belgium | 265 | Ozaukee County |
| Celebrations On The River | WI6321344 | NTNCWS | La Crosse | 815 | La Crosse County |
| Cent Wis Env Center Bathhouse | WI7500919 | NTNCWS | Amherst Junction | 135 | Portage County |
| Center For Jewish Life | WI2461420 | NTNCWS | Mequon | 200 | Ozaukee County |
| Central Brown Co Water Authority | WI4360287 | CWS | Green Bay | 25 | Brown County |
| Central Sands Community High School | WI7501307 | NTNCWS | Amherst | 50 | Portage County |
| Centuria Waterworks | WI6490332 | CWS | Centuria | 900 | Polk County |
| Century Estates 1 | WI2460143 | CWS | Thiensville | 130 | Ozaukee County |
| Cesa 5 Fort Winnebago | WI1110274 | NTNCWS | Portage | 44 | Columbia County |
| Cex' Ha Ci | 055295015 | CWS | Black River Falls | 2,002 | Wood County |
| Chain Exploration Center | WI4690636 | NTNCWS | Waupaca | 150 | Waupaca County |
| Chapman Oil Inc | WI2686118 | NTNCWS | Eagle | 386 | Waukesha County |
| Chaseburg Waterworks Village Of | WI6630251 | CWS | Chaseburg | 306 | Vernon County |
| Chetek Waterworks | WI6030129 | CWS | Chetek | 1,931 | Barron County |
| Chiara Convent | WI4360640 | CWS | Manitowoc | 40 | Manitowoc County |
| Christ Alone Lutheran School & Church | WI2460198 | NTNCWS | Thiensville | 559 | Ozaukee County |
| Christ Ev Lutheran School | WI4700521 | NTNCWS | Weyauwega | 170 | Waushara County |
| Christ Lutheran School And Church | WI2680725 | NTNCWS | Big Bend | 704 | Waukesha County |
| Christ The King Lutheran Church Delafield | WI2680405 | NTNCWS | Delafield | 288 | Waukesha County |
| Christian Education Leadership Academy | WI2686490 | NTNCWS | Pewaukee | 400 | Waukesha County |
| Christian Parents For Kids Day Care | WI4201250 | NTNCWS | Fond Du Lac | 120 | Fond du Lac County |
| Church Of The Resurrection | WI2685864 | NTNCWS | Pewaukee | 170 | Waukesha County |
| Clark County Rehabilitation & Living Center | WI6100336 | CWS | Owen | 510 | Clark County |
| Clayton Waterworks | WI6490334 | CWS | Claytoon | 765 | Polk County |
| Clear Lake Waterworks | WI6490335 | CWS | Clear Lake | 1,061 | Polk County |
| Cleveland Waterworks | WI4360426 | CWS | Cleveland | 1,524 | Manitowoc County |
| Cloverleaf Mobile Home Park | WI4690392 | CWS | Cedaredge | 175 | Shawano County |
| Clyman Waterworks | WI1140140 | CWS | Clyman | 422 | Dodge County |
| Coachmans Terrace Mhp | WI2650150 | CWS | Farmington Hills | 125 | Walworth County |
| Cobb Waterworks | WI1250076 | CWS | Cobb | 458 | Iowa County |
| Cochrane Fountain City School | WI6060338 | NTNCWS | Fountain City | 635 | Buffalo County |
| Cochrane Waterworks | WI6060226 | CWS | Cochrane | 450 | Buffalo County |
| Colby Waterworks | WI7370169 | CWS | Colby | 1,829 | Clark County, Marathon County |
| Coleman Waterworks | WI4380436 | CWS | Coleman | 727 | Marinette County |
| Colfax Waterworks | WI6170261 | CWS | Colfax | 1,102 | Dunn County |
| Coloma Waterworks | WI4700265 | CWS | Coloma | 454 | Waushara County |
| Colonial Gardens Homes | WI4200484 | CWS | Fond Du Lac | 48 | Fond du Lac County |
| Color Vision Ltd | WI7372471 | NTNCWS | Edgar | 65 | Marathon County |
| Columbus Chemical Industries Inc | WI1140311 | NTNCWS | Columbus | 60 | Dodge County |
| Community Christian School Of Baraboo | WI1570356 | NTNCWS | Baraboo | 85 | Sauk County |
| Community Church & School North Campus | WI2670136 | NTNCWS | Campbellsport | 247 | Washington County |
| Community United Methodist Church | WI2680506 | NTNCWS | Elm Grove | 229 | Waukesha County |
| Concord 1 Fund Llc | WI2461702 | NTNCWS | Mequon | 48 | Ozaukee County |
| Concordia University | WI2460118 | CWS | Mequon | 1,500 | Ozaukee County |
| Consolidated School | WI1540331 | NTNCWS | Milton | 100 | Rock County |
| Coon Valley Waterworks | WI6630252 | CWS | Coon Valley | 765 | Vernon County |
| Cornell Waterworks | WI6090458 | CWS | Cornell | 1,390 | Chippewa County |
| Cortland Acres | WI6420299 | CWS | Sauk City | 145 | Monroe County |
| Cottage Glen Condominiums | WI4150000 | CWS | Green Bay | 52 | Door County |
| Cottages At Cedar Run | WI2671964 | CWS | West Bend | 183 | Washington County |
| Coulee Creek Estates Bv | WI6320316 | CWS | Boca Raton | 300 | La Crosse County |
| Coulee Creek Estates Gv | WI6320484 | CWS | Boca Raton | 80 | La Crosse County |
| Coulee Manor Trailer Park | WI6320307 | CWS | Stevens Point | 39 | La Crosse County |
| Country Aire Apartments 2 | WI2680247 | CWS | Delafield | 90 | Waukesha County |
| Country Aire Apartments 3 | WI2680249 | CWS | Delafield | 80 | Waukesha County |
| Country Aire Condos 4821 | WI2685101 | CWS | Pewaukee | 40 | Waukesha County |
| Country Aire Condos 4835 | WI2685210 | CWS | Pewaukee | 40 | Waukesha County |
| Country Aire Condos 4875 | WI2685345 | CWS | Pewaukee | 40 | Waukesha County |
| Country Aire Condos 4887 | WI2685211 | CWS | Pewaukee | 40 | Waukesha County |
| Country Aire Mobile Home Court Llc | WI4080274 | CWS | Stevens Point | 98 | Calumet County |
| Country Aire Mobile Home Park | WI4200490 | CWS | Random Lake | 60 | Fond du Lac County |
| Country Care Childrens Center | WI1220686 | NTNCWS | Cuba City | 92 | Grant County |
| Country Court Subdivision | WI2684746 | CWS | Brookfield | 45 | Waukesha County |
| Country Cove Court Llc | WI6560125 | CWS | Minneapolis | 150 | St. Croix County |
| Country Creek Learning Center | WI1130740 | NTNCWS | Deforest | 158 | Dane County |
| Country Dale School | WI2410685 | NTNCWS | Franklin | 523 | Milwaukee County |
| Country Estates Sanitary District Town Of Lyons 1 | WI2650127 | CWS | Burlington | 500 | Walworth County |
| Country Kids Childcare & Preschool | WI6091423 | NTNCWS | Bloomer | 45 | Chippewa County |
| Country Manor Apts | WI6480403 | CWS | Bay City | 50 | Pierce County |
| Country Road Estates | WI6620325 | CWS | Ettrick | 120 | Trempealeau County |
| Country Terrace Condo Homes | WI2460128 | CWS | Mequon | 160 | Ozaukee County |
| Country View Estates | WI1130214 | CWS | Mt Horeb | 65 | Dane County |
| Country View Holdings Llc | WI6560136 | CWS | Champlin | 75 | St. Croix County |
| Country View Mobile Home Community Llc | WI1130248 | CWS | Los Angeles | 80 | Dane County |
| Country View Mobile Home Court | WI6030130 | CWS | Elk Mound | 54 | Barron County |
| Country Vineyard 4 | WI1130603 | CWS | Oregon | 28 | Dane County |
| Countryside Estates Mhc | WI6180288 | CWS | Sandy | 96 | Eau Claire County |
| Countryside Mobile Homes | WI6170276 | CWS | Eau Claire | 50 | Dunn County |
| Countryside Vet Services | WI4451994 | NTNCWS | Appleton | 25 | Outagamie County |
| County Line Estates | WI1540135 | CWS | Whitewater | 240 | Rock County |
| County Materials - Ready Mix Shop | WI6561105 | NTNCWS | Marathon | 80 | St. Croix County |
| County Materials Corp | WI1541639 | NTNCWS | Marathon | 65 | Rock County |
| County Materials Corporation | WI7372062 | NTNCWS | Marathon | 30 | Marathon County |
| County Materials Corporation - Office | WI6560057 | NTNCWS | Marathon | 25 | St. Croix County |
| Covia Holdings Corporation | WI6420801 | NTNCWS | The Woodlands | 70 | Monroe County |
| Cozy Acres Mhp | WI1220088 | CWS | Baraboo | 80 | Grant County |
| Cozy Mhp Llc Back | WI6180513 | CWS | Miami Beach | 35 | Eau Claire County |
| Cozy Mhp Llc Front | WI6180286 | CWS | Miami Beach | 111 | Eau Claire County |
| Crandon Waterworks | WI7210107 | CWS | Crandon | 1,958 | Forest County |
| Crave Brothers Farm Llc - Main System | WI1141184 | NTNCWS | Waterloo | 115 | Dodge County |
| Create-A-Pack Foods | WI1281140 | NTNCWS | Ixonia | 120 | Jefferson County |
| Creekwood Cage Free | WI1281314 | NTNCWS | Lake Mills | 102 | Jefferson County |
| Crestview Academy Addition | WI6181111 | NTNCWS | Eau Claire | 203 | Eau Claire County |
| Crivitz Waterworks | WI4380411 | CWS | Crivitz | 1,026 | Marinette County |
| Crossroads Community Church | WI4601837 | NTNCWS | Sheboygan | 196 | Sheboygan County |
| Crossroads Presbyterian Church & Preschool | WI2460214 | NTNCWS | Mequon | 86 | Ozaukee County |
| Crown Of Life Ev Lutheran Sch & Ch | WI2670233 | NTNCWS | Hubertus | 95 | Washington County |
| Cru Concrete | WI1134003 | NTNCWS | Dane | 80 | Dane County |
| Crystal Lake Rv Resort Llc | WI1110066 | CWS | Lodi | 725 | Columbia County |
| Cuba City Waterworks | WI1220092 | CWS | Cuba City | 2,141 | Grant County, Lafayette County |
| Culvers Of Newville | WI1540271 | NTNCWS | Portage | 1,233 | Rock County |
| Cumberland Waterworks | WI6030132 | CWS | Cumberland | 2,311 | Barron County |
| Curtiss Waterworks | WI6100339 | CWS | Curtiss | 346 | Clark County |
| Cushing Elementary | WI2680562 | NTNCWS | Wales | 425 | Waukesha County |
| Custom Fiberglass Molding | WI4690849 | NTNCWS | Weyauwega | 47 | Waupaca County |
| Dairiconcepts Chili | WI6100580 | NTNCWS | Kansas City | 37 | Clark County |
| Dairiconcepts Lp | WI8550175 | NTNCWS | Bruce | 66 | Rusk County |
| Dairy Dreams Llc | WI4310039 | NTNCWS | Kewaunee | 30 | Kewaunee County |
| Dairy State Cheese | WI7720725 | NTNCWS | Rudolph | 235 | Wood County |
| Dairyfood Usa Inc | WI1130465 | NTNCWS | Blue Mounds | 160 | Dane County |
| Dairyland Farm Llc | WI4050030 | NTNCWS | New Franken | 54 | Brown County |
| Dakota Capital Mhc Llc | WI4700271 | CWS | Green Lake | 102 | Marquette County, Waushara County |
| Dallas Waterworks | WI6030135 | CWS | Dallas | 365 | Barron County |
| Dammas Diner | WI4390477 | NTNCWS | Friendship | 115 | Marquette County |
| Danbury Sanitary District | WI8070012 | CWS | Danbury | 286 | Burnett County |
| Dane Co Hwy Garage East | WI1134246 | NTNCWS | Madison | 55 | Dane County |
| Dane Waterworks | WI1130220 | CWS | Dane | 1,117 | Dane County |
| Danville Drive Service Area | WI1134098 | CWS | Fitchburg | 150 | Dane County |
| Darien Waterworks | WI2650057 | CWS | Darien | 1,573 | Walworth County |
| Darlington Ridge Farms | WI1330003 | NTNCWS | Darlington | 32 | Lafayette County |
| Darlington Waterworks | WI1330073 | CWS | Darlington | 2,235 | Lafayette County |
| Davids Star Ev Lutheran School | WI2670221 | NTNCWS | Jackson | 143 | Washington County |
| Day By Day Discoveries Child Care | WI4052171 | NTNCWS | New Franken | 124 | Brown County |
| Daybreak Foods Inc - Cold Spring | WI1280033 | NTNCWS | Lake Mills | 37 | Jefferson County |
| Daybreak Foods Inc - S&R | WI2650723 | NTNCWS | Lake Mills | 35 | Walworth County |
| Dayspring Baptist Church Inc | WI2686802 | NTNCWS | Pewaukee | 636 | Waukesha County |
| Daystar Properties | WI2461534 | NTNCWS | Oconomowoc | 80 | Ozaukee County |
| De Pere Waterworks Sa 2 | WI4052638 | CWS | De Pere | 118 | Brown County |
| De Soto High-Middle School | WI6630338 | NTNCWS | Desoto | 403 | Vernon County |
| Dean Distributing | WI7641019 | NTNCWS | Arbor Vitae | 33 | Vilas County |
| Decatur Swiss Cheese Coop | WI1230043 | NTNCWS | Brodhead | 55 | Green County |
| Deer Run Mobile Home Community | WI7350094 | CWS | Boulder | 49 | Lincoln County |
| Deer Trail Village | WI7370158 | CWS | Mosinee | 120 | Marathon County |
| Deerfield Waterworks | WI1130223 | CWS | Deerfield | 2,510 | Dane County |
| Delafield Hotel | WI2685886 | NTNCWS | Delafield | 465 | Waukesha County |
| Delafield Lakes 402 | WI2686101 | CWS | Madison | 40 | Waukesha County |
| Delafield Lakes 404 | WI2686114 | CWS | Madison | 40 | Waukesha County |
| Delafield Square | WI2685812 | CWS | Pewaukee | 587 | Waukesha County |
| Delafield Waterworks | WI2684642 | CWS | Delafield | 300 | Waukesha County |
| Delafield Woods 411 | WI2686336 | CWS | Madison | 40 | Waukesha County |
| Delafield Woods 828 | WI2686337 | CWS | Madison | 40 | Waukesha County |
| Delavan Club Condos | WI2650929 | CWS | Burlington | 395 | Walworth County |
| Dell Creek Estates | WI1571232 | CWS | Wisconsin Dells | 50 | Sauk County |
| Dells Club Condo Assoc 1 | WI7010423 | CWS | Wisconsin Dells | 75 | Adams County |
| Dells Club Condo Assoc 2 | WI7010424 | CWS | Wisconsin Dells | 75 | Adams County |
| Dells Club Condo Assoc 3 | WI7010425 | CWS | Wisconsin Dells | 75 | Adams County |
| Dells Estates | WI1111017 | CWS | Plain | 30 | Columbia County, Marquette County |
| Dental Health Products Inc | WI4051782 | NTNCWS | New Franken | 130 | Brown County |
| Devils Head Resort | WI1570393 | NTNCWS | Merrimac | 535 | Sauk County |
| Dickeyville Waterworks | WI1220094 | CWS | Dickeyville | 1,069 | Grant County |
| Didion Ethanol | WI1110879 | NTNCWS | Cambria | 85 | Columbia County |
| Diesel Driving School | WI1130307 | NTNCWS | Sun Prairie | 130 | Dane County |
| Discovery Days Ii | WI2522925 | NTNCWS | Wind Lake | 132 | Racine County |
| Docs Harley/Timeline Bbq | WI4590333 | NTNCWS | Bonduel | 100 | Shawano County |
| Dodge Sanitary Dist 1 | WI6620165 | CWS | Dodge | 120 | Trempealeau County |
| Don Larson Chevrolet Buick Gmc | WI1571087 | NTNCWS | Merrimac | 60 | Sauk County |
| Donges Bay 5401 | WI2460220 | NTNCWS | West Allis | 95 | Ozaukee County |
| Dons Mobile Manor | WI1130266 | CWS | Waunakee | 160 | Dane County |
| Doorway To Learning | WI4150600 | NTNCWS | Sturgeon Bay | 170 | Door County |
| Dorchester Waterworks | WI6100326 | CWS | Dorchester | 834 | Clark County |
| Douglas Plaza North | WI2680288 | CWS | Waukesha | 30 | Waukesha County |
| Douglas Plaza South | WI2680862 | CWS | Waukesha | 62 | Waukesha County |
| Dousman Water Utility | WI2680197 | CWS | Dousman | 2,350 | Waukesha County |
| Downsville Sanitary District | WI6170263 | CWS | Downsville | 250 | Dunn County |
| Dresser Waterworks | WI6490336 | CWS | Dresser | 936 | Polk County |
| Drought School | WI2520399 | NTNCWS | Franksville | 136 | Racine County |
| Drummond Sanitary District | WI8040129 | CWS | Drummond | 500 | Bayfield County |
| Dry Town | 055295310 | CWS | Hayward | 3,030 | Sawyer County |
| Duck Inn Mhp 2 | WI4390009 | CWS | Pardeeville | 25 | Marquette County |
| Duncan Prairie Mhc | WI6090445 | CWS | Westby | 64 | Chippewa County |
| Dunn Energy Coop | WI6170591 | NTNCWS | Menomonie | 30 | Dunn County |
| Durand Waterworks | WI6470107 | CWS | Durand | 1,868 | Pepin County |
| Durham Meadows Water Trust | WI2680213 | CWS | Muskego | 700 | Waukesha County |
| Dvo Inc | WI4080440 | NTNCWS | Chilton | 33 | Calumet County |
| Eagle Chateau Apts | WI2300118 | CWS | Mt Pleasant | 125 | Kenosha County, Racine County |
| Eagle Lake Manor | WI2520102 | CWS | Kansasville | 250 | Racine County |
| Eagle River Waterworks | WI7640113 | CWS | Eagle River | 1,530 | Vilas County |
| Eagle Waterworks | WI2680198 | CWS | Eagle | 1,950 | Waukesha County |
| Eagleville Elementary School | WI2680752 | NTNCWS | Mukwonago | 165 | Waukesha County |
| East Bristol Utility Coop | WI1130278 | CWS | Sun Prairie | 80 | Dane County |
| East Field Office Center | WI2461379 | NTNCWS | Mequon | 56 | Ozaukee County |
| East Towne Square 1340 | WI2460873 | NTNCWS | Mequon | 130 | Ozaukee County |
| East Troy S D 3 | WI2650156 | CWS | East Troy | 40 | Walworth County |
| Eastman Waterworks | WI6120243 | CWS | Eastman | 342 | Crawford County |
| Eastmound Center | WI2682354 | NTNCWS | Pynette | 310 | Waukesha County |
| Eaton Cooper Power Systems | WI2520217 | NTNCWS | Franksville | 70 | Racine County |
| Eau Claire Coop Oil Co | WI6180717 | NTNCWS | Eau Claire | 80 | Eau Claire County |
| Eau Claire Energy Cooperative | WI6180432 | NTNCWS | Fall Creek | 46 | Eau Claire County |
| Ebert Enterprises Llc | WI4310040 | NTNCWS | Algoma | 100 | Kewaunee County |
| Echo Lake Foods Yorkville | WI2521247 | NTNCWS | Franksville | 125 | Racine County |
| Eden Elementary School | WI4200559 | NTNCWS | Campbellsport | 253 | Fond du Lac County |
| Eden Meats And Corner Express | WI4201040 | NTNCWS | Eden | 285 | Fond du Lac County |
| Eden Pet Products Llc | WI4200700 | NTNCWS | Eden | 85 | Fond du Lac County |
| Eden Stone Saw Plant & Cut Shop | WI4201483 | NTNCWS | Eden | 30 | Fond du Lac County |
| Edgar Waterworks | WI7370150 | CWS | Edgar | 1,491 | Marathon County |
| Edgerton I90 Travel Plaza | WI1130560 | NTNCWS | Edgerton | 533 | Dane County |
| Edgewood Country Estates | WI7371500 | CWS | Wausau | 49 | Marathon County |
| Edgewood Mobile Home Park | WI6630268 | CWS | La Crosse | 90 | Vernon County |
| Edmund Tn Of Linden San Dist 1 | WI1250238 | CWS | Edmund | 110 | Iowa County |
| Elcho Sanitary District 1 | WI7340117 | CWS | Elcho | 400 | Langlade County |
| Elder Care Cottages East | WI2522889 | NTNCWS | Burlington | 55 | Racine County |
| Elder Care Cottages West | WI2522890 | NTNCWS | Burlington | 55 | Racine County |
| Eleva Strum Elementary School | WI6620741 | NTNCWS | Strum | 100 | Trempealeau County |
| Eleva Strum High School | WI6620367 | NTNCWS | Strum | 175 | Trempealeau County |
| Eleva Waterworks | WI6620270 | CWS | Eleva | 635 | Trempealeau County |
| Elizabeth Manor Apts | WI2300854 | CWS | Genoa City | 30 | Kenosha County |
| Elk Mound Waterworks | WI6170264 | CWS | Elk Mound | 895 | Dunn County |
| Elkhart Lake Waterworks | WI4600439 | CWS | Elkhart Lake | 1,567 | Sheboygan County |
| Ellsworth Coop Creamery | WI6480200 | NTNCWS | Ellsworth | 150 | Pierce County |
| Elm Grove Lutheran School & Church | WI2682148 | NTNCWS | Elm Grove | 420 | Waukesha County |
| Elm Grove Preschool & Child Care | WI2686304 | NTNCWS | Elm Grove | 96 | Waukesha County |
| Elm Grove Terrace | WI2680279 | CWS | Mequon | 75 | Waukesha County |
| Elm Grove Village Hall | WI2681701 | NTNCWS | Elm Grove | 294 | Waukesha County |
| Elmbrook Memorial Hospital | WI2680437 | NTNCWS | Brookfield | 1,250 | Waukesha County |
| Elmbrook- Lake Country | WI2685887 | NTNCWS | Brookfield | 600 | Waukesha County |
| Elmore Heights Trailer Court | WI4200489 | CWS | Hubertus | 30 | Fond du Lac County |
| Elmwood Waterworks | WI6480250 | CWS | Elmwood | 798 | Pierce County |
| Elroy Waterworks | WI7290122 | CWS | Elroy | 1,333 | Juneau County |
| Emanuel United Church Of Christ | WI2410753 | NTNCWS | Hales Corners | 218 | Milwaukee County |
| Embarrass Waterworks | WI4690393 | CWS | Embarrass | 346 | Waupaca County |
| Emerald Woods Condos | WI2685370 | CWS | Milwaukee | 150 | Waukesha County |
| Empire Screen Printing Clean Room | WI6320677 | NTNCWS | Onalaska | 200 | La Crosse County |
| Empire Screen Printing Office | WI6320675 | NTNCWS | Onalaska | 70 | La Crosse County |
| Equinox Rei Llc Dellwood Estates | WI1570503 | CWS | Minneapolis | 70 | Sauk County |
| Erin School | WI2670245 | NTNCWS | Hartford | 405 | Washington County |
| Essential Industries Inc | WI2680076 | NTNCWS | Merton | 70 | Waukesha County |
| Ettrick Waterworks | WI6620273 | CWS | Ettrick | 536 | Trempealeau County |
| Evergreen Estates | WI7640118 | CWS | Arbor Vitae | 50 | Vilas County |
| Evergreen Park Suring Llc | WI4430499 | CWS | Boca Raton | 100 | Oconto County |
| Evergreen Villa Mobile Homes | WI7500269 | CWS | Farmington Hills | 250 | Portage County |
| Evergreens | WI2680290 | CWS | Pewaukee | 40 | Waukesha County |
| Exeland Waterworks | WI8581015 | CWS | Exeland | 196 | Sawyer County |
| Fairbanks Morse Engine Div | WI1540314 | NTNCWS | Beloit | 330 | Rock County |
| Fairchild Waterworks | WI6180295 | CWS | Fairchild | 451 | Eau Claire County |
| Fairview School | WI4430587 | NTNCWS | Pulaski | 143 | Oconto County |
| Fairwater Waterworks | WI4200463 | CWS | Fairwater | 365 | Fond du Lac County |
| Faith Christian School | WI2650580 | NTNCWS | Williams Bay | 275 | Walworth County |
| Faith Community Church/School | WI1281040 | NTNCWS | Ft Atkinson | 550 | Jefferson County |
| Faith Lutheran Church & School | WI4240261 | NTNCWS | Markesan | 50 | Green Lake County |
| Fall Creek Waterworks | WI6180296 | CWS | Fall Creek | 1,269 | Eau Claire County |
| Fall River Waterworks | WI1110098 | CWS | Fall River | 1,793 | Columbia County |
| Family Forum Head Start Inc Center 4 | WI8160829 | NTNCWS | Superior | 50 | Douglas County |
| Farm & Fleet Of Dodgeville | WI1250217 | NTNCWS | Janesville | 540 | Iowa County |
| Farmington Elementary School | WI2670166 | NTNCWS | Kewaskum | 280 | Washington County |
| Federal Correctional Institution | WI7010105 | CWS | Oxford | 1,550 | Adams County, Marquette County |
| Fennimore Waterworks | WI1220096 | CWS | Fennimore | 2,507 | Grant County |
| Fields Of Waterford | WI2522850 | CWS | Burlington | 32 | Racine County |
| Fifield Sanitary District | WI8510408 | CWS | Fifield | 300 | Price County |
| First Congreg United Ch Of Christ/Gingerbread Preschool | WI1281041 | NTNCWS | Watertown | 280 | Jefferson County |
| First Natl Community Bank | WI6560986 | NTNCWS | Hudson | 65 | St. Croix County |
| Fishermans Paradise Mhp | WI7440609 | CWS | Stevens Point | 54 | Oneida County |
| Fitchburg Utility Dist 1 South | WI1131004 | CWS | Fitchburg | 350 | Dane County |
| Five Corners Dodge | WI2460568 | NTNCWS | Cedarburg | 39 | Ozaukee County |
| Five Corners Retail | WI2461390 | NTNCWS | Mequon | 87 | Ozaukee County |
| Five Star Building A Finished Goods | WI2302326 | NTNCWS | Twin Lakes | 80 | Kenosha County |
| Five Star Building B D And E Composite | WI2302327 | NTNCWS | Twin Lakes | 80 | Kenosha County |
| Five Star Building C Composite Building | WI2302328 | NTNCWS | Twin Lakes | 80 | Kenosha County |
| Five Star Building F Window Coating | WI2302329 | NTNCWS | Twin Lakes | 80 | Kenosha County |
| Flambeau Correctional Center | WI8581145 | CWS | Hawkins | 120 | Sawyer County |
| Fleet Farm Muskego Main Store | WI2687054 | NTNCWS | Muskego | 1,585 | Waukesha County |
| Florence Utility Commission | WI4190155 | CWS | Florence | 1,250 | Florence County |
| Fond Du Lac Stone Ops Bldg | WI4201496 | NTNCWS | Fond Du Lac | 25 | Fond du Lac County |
| Fond Du Lac Tn Water Utility | WI4200429 | CWS | Fond Du Lac | 980 | Fond du Lac County |
| Fontana Water Utility | WI2650128 | CWS | Fontana | 1,839 | Walworth County |
| Footville Waterworks | WI1540125 | CWS | Footville | 816 | Rock County |
| Foremost Farms Usa Coop Reedsburg | WI1570034 | NTNCWS | Franklin | 52 | Sauk County |
| Foremost Farms Usa Coop Richland Center | WI1530089 | NTNCWS | Franklin | 156 | Richland County |
| Forest Edge Apartments Llc | WI7641097 | CWS | Santa Monica | 100 | Vilas County |
| Fort Mccoy South Post | WI6420307 | CWS | Fort Mccoy | 250 | Monroe County |
| Fountain Bluffs Mhp Llc | WI6060230 | CWS | Minneapolis | 25 | Buffalo County |
| Fountain City Waterworks | WI6060228 | CWS | Fountain City | 443 | Buffalo County |
| Four Corners Elementary School | WI8160487 | NTNCWS | Superior | 300 | Douglas County |
| Fox Bros Piggly Wiggly Inc - Hubertus | WI2671612 | NTNCWS | Hubertus | 1,314 | Washington County |
| Fox Lake Correctional Institution | WI1140144 | CWS | Madison | 1,850 | Dodge County |
| Fox Lake Waterworks | WI1140145 | CWS | Fox Lake | 1,610 | Dodge County |
| Fox Marquette Mobile Home Park | WI4390287 | CWS | Pardeeville | 72 | Marquette County |
| Fox River Valley Ethanol Llc | WI4710064 | NTNCWS | Stanley | 100 | Winnebago County |
| Fox Valley Wood Products | WI4450523 | NTNCWS | Kaukauna | 42 | Outagamie County |
| Franklin Mhp | WI2410602 | CWS | Las Vegas | 118 | Milwaukee County |
| Franks Field | 055295104 | CWS | Odanah | 242 | Ashland County |
| Frederic Waterworks | WI6490337 | CWS | Frederic | 1,241 | Polk County |
| Fredonia Waterworks | WI2460109 | CWS | Fredonia | 2,279 | Ozaukee County |
| Freedom Sanitary District | WI4451607 | CWS | Freedom | 3,260 | Outagamie County |
| Fremont Elementary School | WI4690593 | NTNCWS | Weyauwega | 145 | Waupaca County |
| Friendship Valley Dairy Llc | WI4690022 | NTNCWS | Clintonville | 34 | Waupaca County |
| Friendship Waterworks | WI7010110 | CWS | Friendship | 781 | Adams County |
| Friesland Waterworks | WI1110099 | CWS | Friesland | 345 | Columbia County |
| Friess Lake Elementary School | WI2670234 | NTNCWS | Richfield | 407 | Washington County |
| From The Roots | WI6180799 | NTNCWS | Eau Claire | 79 | Eau Claire County |
| Fromm Family Foods Columbus | WI1110622 | NTNCWS | Columbus | 129 | Columbia County |
| Fromm Family Foods Llc | WI2460183 | NTNCWS | Mequon | 30 | Ozaukee County |
| Front Porch Pets Inc | WI4700218 | NTNCWS | Wild Rose | 35 | Waushara County |
| Fulton Utility District | WI1541223 | CWS | Milton | 200 | Rock County |
| Furst Mcness Company | WI1110956 | NTNCWS | Lodi | 80 | Columbia County |
| G & V Machine Co Inc | WI1281075 | NTNCWS | Ixonia | 127 | Jefferson County |
| Galesville Waterworks | WI6620271 | CWS | Galesville | 1,679 | Trempealeau County |
| Galleria Offices | WI2460862 | NTNCWS | Mequon | 55 | Ozaukee County |
| Gays Mills Waterworks | WI6120244 | CWS | Gays Mills | 490 | Crawford County |
| Generac Power Systems Inc | WI2680385 | NTNCWS | Waukesha | 875 | Waukesha County |
| Genesee Lake School North | WI2680806 | CWS | Oconomowoc | 110 | Waukesha County |
| Genesee Lake School South | WI2683331 | CWS | Oconomowoc | 230 | Waukesha County |
| Geneva Landings | WI2651482 | CWS | Burlington | 25 | Walworth County |
| Geneva National Community Services | WI2650907 | CWS | Lake Geneva | 2,250 | Walworth County |
| Genex Cooperative Inc | WI4590373 | NTNCWS | Shawano | 25 | Shawano County |
| Genmet Corp | WI2460386 | NTNCWS | Mequon | 65 | Ozaukee County |
| Genoa City Waterworks | WI2650058 | CWS | Genoa City | 2,766 | Walworth County |
| Genoa Waterworks | WI6630254 | CWS | Genoa | 264 | Vernon County |
| Germantown Learning Center & Childcare | WI2670333 | NTNCWS | Germantown | 124 | Washington County |
| Germantown Mutual Insurance | WI2671135 | NTNCWS | Germantown | 60 | Washington County |
| Gfl Horicon Hauling | WI1141365 | NTNCWS | Horicon | 86 | Dodge County |
| Gfl Wisconsin Materials Recovery Facility | WI1141344 | NTNCWS | Horicon | 50 | Dodge County |
| Gibraltar High School | WI4151199 | NTNCWS | Fish Creek | 695 | Door County |
| Gillett Waterworks | WI4430490 | CWS | Gillett | 1,264 | Oconto County |
| Gilman Waterworks | WI8610124 | CWS | Gilman | 372 | Taylor County |
| Gilmanton Elementary School | WI6060334 | NTNCWS | Gilmanton | 125 | Buffalo County |
| Gilmanton Middle/High School | WI6060335 | NTNCWS | Gilmanton | 125 | Buffalo County |
| Glacier View Subdivision | WI1570924 | CWS | Baraboo | 75 | Sauk County |
| Gleason Mennonite Church & School | WI7350069 | NTNCWS | Gleason | 130 | Lincoln County |
| Glen Flora Waterworks | WI8550454 | CWS | Glen Flora | 93 | Rusk County |
| Glen Oaks Office Park | WI2461154 | NTNCWS | Mequon | 400 | Ozaukee County |
| Glenbeulah Waterworks | WI4600440 | CWS | Glenbeulah | 461 | Sheboygan County |
| Glenwood City Waterworks | WI6560120 | CWS | Glenwood City | 1,102 | St. Croix County |
| Glidden Sanitary District | WI8020376 | CWS | Glidden | 750 | Ashland County |
| Glk Sauerkraut Llc | WI4450609 | NTNCWS | Miami | 150 | Outagamie County |
| Goetschs Welding & Machine Inc | WI7372520 | NTNCWS | Merrill | 65 | Marathon County |
| Goodman Sanitary Dist No 1 | WI4380438 | CWS | Goodman | 350 | Forest County, Marinette County |
| Gordie Boucher Ford Of Thiensville Inc | WI2460194 | NTNCWS | Greenfield | 70 | Ozaukee County |
| Gordon Correctional Center | WI8160142 | CWS | Madison | 124 | Douglas County |
| Gospel Mennonite School | WI6030282 | NTNCWS | Almena | 45 | Barron County |
| Grace Lutheran Child Development Ctr | WI2300388 | NTNCWS | Burlington | 65 | Kenosha County |
| Graetz Manufacturing Office | WI4380886 | NTNCWS | Pound | 26 | Marinette County |
| Grand Ave Apartments | WI2460640 | CWS | Milwaukee | 80 | Ozaukee County |
| Grande Cheese Co Brownsville | WI1140217 | NTNCWS | Fond Du Lac | 230 | Dodge County |
| Grande Cheese Co Chilton Plant | WI4080450 | NTNCWS | Chilton | 85 | Calumet County |
| Grande Cheese Co Rubicon | WI1140055 | NTNCWS | Rubicon | 60 | Dodge County |
| Grande Cheese Company | WI1230068 | NTNCWS | Juda | 110 | Green County |
| Grande Cheese Wyocena | WI1110045 | NTNCWS | Fond Du Lac | 100 | Columbia County, Fond du Lac County |
| Grande Custom Ingredients | WI1230311 | NTNCWS | Juda | 64 | Green County |
| Grandview Mobile Home Court | WI6100332 | CWS | Neillsville | 42 | Clark County |
| Granite Microsystems | WI2461297 | NTNCWS | Mequon | 70 | Ozaukee County |
| Grant Elementary School | WI7500268 | NTNCWS | Wisconsin Rapids | 350 | Portage County |
| Granton Waterworks | WI6100327 | CWS | Granton | 349 | Clark County |
| Grantsburg Manufactured Home Community | WI8070023 | CWS | St Paul | 115 | Burnett County |
| Grantsburg Waterworks | WI8070310 | CWS | Grantsburg | 1,460 | Burnett County |
| Grassland Dairy Prod Inc | WI6100259 | NTNCWS | Greenwood | 400 | Clark County |
| Grassland Dairy Prod Inc - Office | WI6100036 | NTNCWS | Greenwood | 110 | Clark County |
| Gratiot Waterworks | WI1330074 | CWS | Gratiot | 224 | Lafayette County |
| Graymont Eden Kiln And Whse | WI4200424 | NTNCWS | Eden | 46 | Fond du Lac County |
| Graymont Eden Office | WI4201490 | NTNCWS | Eden | 46 | Fond du Lac County |
| Great Lakes Veterinary Clinic | WI4710597 | NTNCWS | Neenah | 59 | Winnebago County |
| Green Acres Mobile Homes | WI6180298 | CWS | Colfax | 48 | Eau Claire County |
| Green Lake Mhp | WI4240223 | CWS | Cedar Rapids | 70 | Green Lake County |
| Green Lake Waterworks | WI4240217 | CWS | Green Lake | 1,002 | Green Lake County |
| Green Oaks Mobile Home Court | WI6320308 | CWS | Holmen | 117 | La Crosse County, Trempealeau County |
| Green Valley Dairy Llc | WI4590012 | NTNCWS | Krakow | 45 | Shawano County |
| Green Valley Enterprises | WI1140790 | NTNCWS | Beaver Dam | 110 | Dodge County |
| Greenleaf Waterworks | WI4050466 | CWS | Greenleaf | 650 | Brown County |
| Greenville Utilities Vil Of/Crestview Subdivision | WI4451734 | CWS | Greenville | 120 | Outagamie County |
| Greenwood Waterworks | WI6100328 | CWS | Greenwood | 1,079 | Clark County |
| Gregg Young Cdjr Abrams | WI4430311 | NTNCWS | Abrams | 90 | Oconto County |
| Gregg Young Hortonville Ford | WI4452027 | NTNCWS | Hortonville | 79 | Outagamie County |
| Gresham Waterworks | WI4590454 | CWS | Gresham | 534 | Shawano County |
| Gws Tool Group | WI2681050 | NTNCWS | North Lake | 46 | Waukesha County |
| Habeck Mobile Home Park | WI4430148 | CWS | Abrams | 35 | Oconto County |
| Haddonstone Subdivision | WI2460694 | CWS | Mequon | 195 | Ozaukee County |
| Hale Park Meadows | WI2680216 | CWS | Muskego | 720 | Waukesha County |
| Hammond Waterworks | WI6560121 | CWS | Hammond | 1,884 | St. Croix County |
| Hancock Waterworks | WI4700267 | CWS | Hancock | 419 | Waushara County |
| Harmony Grove San Dist | WI1110101 | CWS | Lodi | 1,950 | Columbia County |
| Harmony Hills Mh Village | WI7440121 | CWS | Plymouth | 100 | Oneida County |
| Harmony Mobile Manor | WI1110065 | CWS | Lodi | 45 | Columbia County |
| Hartje Lumber | WI1570862 | NTNCWS | La Valle | 75 | Sauk County |
| Harvest View Mhc | WI2520201 | CWS | Northbrook | 400 | Racine County |
| Hatley Waterworks | WI7371256 | CWS | Hatley | 550 | Marathon County |
| Haugen Waterworks | WI6030143 | CWS | Haugen | 287 | Barron County |
| Hawkins Waterworks | WI8550129 | CWS | Kennan | 333 | Rusk County |
| Hayward Water Utility | WI8580532 | CWS | Hayward | 2,552 | Sawyer County |
| Hazel Green Waterworks | WI1220102 | CWS | Hazel Green | 1,193 | Grant County |
| Hb Performance Systems Inc | WI2460212 | NTNCWS | Mequon | 315 | Ozaukee County |
| Heartland Montessori School | WI6480622 | NTNCWS | River Falls | 64 | Pierce County |
| Hearts & Hands Inc Of Mt Horeb | WI1130505 | NTNCWS | Mount Horeb | 128 | Dane County |
| Heattek | WI1281163 | NTNCWS | Ixonia | 42 | Jefferson County |
| Heaven City | WI2680624 | CWS | Mukwonago | 106 | Waukesha County |
| Hebron Community & Head Start Building | WI1280316 | NTNCWS | Hebron | 143 | Jefferson County |
| Heidel Rd Apts 139 | WI2460152 | CWS | Milwaukee | 40 | Ozaukee County |
| Heidel Rd Apts 152 | WI2460158 | CWS | Milwaukee | 40 | Ozaukee County |
| Hendrix Llc | WI2680948 | NTNCWS | Delafield | 82 | Waukesha County |
| Henning Cheese | WI4361303 | NTNCWS | Kiel | 45 | Manitowoc County |
| Heritage Lake Resort | WI4151845 | CWS | Egg Harbor | 130 | Door County |
| Hertel West | 055295902 | CWS | Webster | 1,281 | Burnett County |
| Hiawatha Mh Estates Clbhse | WI7440118 | CWS | Arbor Vitae | 124 | Vilas County |
| Hiawatha Mh Estates Old Office | WI7441240 | CWS | Arbor Vitae | 84 | Vilas County |
| Hickory Haven Mhc | WI2520196 | CWS | Northbrook | 303 | Racine County |
| Hickory Hill Park Llc | WI1280116 | CWS | Sussex | 31 | Jefferson County |
| Hickory Shade | WI7720167 | CWS | Grafton | 55 | Wood County |
| Hidden Acres Mobile Pk 1 | WI7641357 | CWS | Plainfield | 32 | Vilas County |
| Hidden Acres Mobile Pk 2 | WI7641359 | CWS | Plainfield | 39 | Vilas County |
| Hidden Acres Mobile Pk 3 | WI7641360 | CWS | Plainfield | 29 | Vilas County |
| Hidden Glen Golf Course Clubhouse | WI2671946 | NTNCWS | Cedarburg | 255 | Washington County |
| Hidden Meadows | WI1140016 | CWS | Watertown | 166 | Dodge County |
| Highland Colony Estates Condo | WI2460120 | CWS | Mequon | 88 | Ozaukee County |
| Highland Waterworks | WI1250080 | CWS | Highland | 842 | Iowa County |
| Hillcrest Estates Mhp | WI6180285 | CWS | Altoona | 850 | Eau Claire County |
| Hillcrest Mennonite School | WI6030898 | NTNCWS | Barron | 40 | Barron County |
| Hills Of Wales Apts | WI2680236 | CWS | Dousman | 50 | Waukesha County |
| Hillsboro Waterworks | WI6630257 | CWS | Hillsboro | 1,325 | Vernon County |
| Hillside | 055295706 | CWS | Oneida | 63 | |
| Hilltop Estates Mhp | WI6560140 | CWS | Minneapolis | 64 | Pierce County, St. Croix County |
| Hilly Haven Llc | WI8510223 | CWS | Stevens Point | 45 | Price County |
| Hixton Waterworks | WI6270292 | CWS | Hixton | 443 | Jackson County |
| Hnr Intermediate School | WI1140395 | NTNCWS | Neosho | 185 | Dodge County |
| Ho Chunk Village | 055295013 | CWS | Black River Falls | 196 | Sauk County |
| Ho-Chunk Che-Nunk | 055295016 | CWS | Black River Falls | 132 | Columbia County |
| Hobart Waterworks S A 1 | WI4051698 | CWS | Hobart | 3,758 | Brown County |
| Hobart Waterworks S A 2 | WI4051769 | CWS | Hobart | 450 | Brown County |
| Hobart Waterworks S A 3 | WI4052077 | CWS | Hobart | 820 | Brown County |
| Hobart Waterworks S A 4 | WI4052639 | CWS | Hobart | 68 | Brown County |
| Hoffmanns Wissota Court | WI6090459 | CWS | Chippewa Falls | 126 | Chippewa County |
| Holcombe High School | WI6090514 | NTNCWS | Holcombe | 445 | Chippewa County |
| Holland Tn Sanitary Dist | WI4050726 | CWS | Kaukauna | 495 | Brown County |
| Hollandale Waterworks | WI1250081 | CWS | Hollandale | 283 | Iowa County |
| Holsum Elm Dairy | WI4080145 | NTNCWS | Hilbert | 35 | Calumet County |
| Holsum Irish Dairy | WI4080003 | NTNCWS | Hilbert | 35 | Calumet County |
| Holy Cross Parish | WI2301479 | NTNCWS | Wilmot | 67 | Kenosha County |
| Holy Family Convent | WI4360447 | CWS | Manitowoc | 195 | Manitowoc County |
| Holy Hill Apartments | WI2300140 | CWS | Lake Villa | 32 | Kenosha County |
| Holy Rosary School | WI6470175 | NTNCWS | Durand | 70 | Pepin County |
| Holy Trinity Church & Learning Center | WI2681107 | NTNCWS | Oconomowoc | 505 | Waukesha County |
| Holy Trinity Church & School | WI4310308 | NTNCWS | Casco | 50 | Kewaunee County |
| Homestead High School | WI2460291 | NTNCWS | Mequon | 1,650 | Ozaukee County |
| Homestead Hs Pavilion | WI2461725 | NTNCWS | Mequon | 125 | Ozaukee County |
| Homesteader Llc The | WI6120109 | CWS | Prairie Du Chien | 200 | Crawford County |
| Honor Elementary | WI1140175 | NTNCWS | Neosho | 280 | Dodge County |
| Hood Equipment Inc | WI8040433 | NTNCWS | Iron River | 25 | Bayfield County |
| Hortonville Water Utility | WI4450411 | CWS | Hortonville | 3,028 | Outagamie County |
| Hot Line Freight System Inc | WI6321238 | NTNCWS | Quebec H4S 1B7 | 26 | La Crosse County |
| Houlton Mhp Llc | WI6560122 | CWS | Orlando | 170 | St. Croix County |
| House On The Rock | WI1250091 | NTNCWS | Spring Green | 2,025 | Iowa County |
| House On The Rock Resort | WI1250318 | CWS | Spring Green | 470 | Iowa County |
| Howards Grove Childrens Center | WI4600481 | NTNCWS | Howards Grove | 64 | Sheboygan County |
| Howards Grove High School & District Office | WI4601234 | NTNCWS | Howards Grove | 360 | Sheboygan County |
| Huntington Mobile Home Park | WI6560128 | CWS | Orlando | 52 | St. Croix County |
| Huntington Park | WI2460151 | CWS | Mequon | 600 | Ozaukee County |
| Hurley Waterworks | WI8260116 | CWS | Hurley | 1,515 | Iron County |
| Hustisford Waterworks | WI1140148 | CWS | Hustisford | 1,063 | Dodge County |
| Hustler Waterworks | WI7290549 | CWS | Hustler | 170 | Juneau County |
| Hwy 51 Truckstop Site 4488 | WI7350774 | NTNCWS | Rothschild | 636 | Lincoln County |
| I A P Inc | WI8510109 | NTNCWS | Phillips | 50 | Price County |
| Immanuel Lutheran Church & Sch | WI1140230 | NTNCWS | Mayville | 310 | Dodge County |
| Inch Heights Llc | WI1110110 | CWS | Juneau | 47 | Columbia County |
| Independence Waterworks | WI6620276 | CWS | Independence | 1,500 | Trempealeau County |
| Indian Heights | 055295012 | CWS | Black River Falls | 126 | Juneau County |
| Indian Hill School | WI2410664 | NTNCWS | Fox Point | 285 | Milwaukee County |
| Indue Sales And Services | WI6560040 | NTNCWS | Hudson | 70 | St. Croix County |
| Industrial Engraving Llc | WI4050674 | NTNCWS | Pulaski | 25 | Brown County |
| Innovation Station Childcare Facility | WI2671805 | NTNCWS | Richfield | 90 | Washington County |
| Innsbruck Water Trust | WI6320314 | CWS | West Salem | 85 | La Crosse County |
| Inspiration Ministries & Meadows Apts | WI2650148 | CWS | Walworth | 80 | Walworth County |
| Inspire Early Childhood Addition | WI1134669 | NTNCWS | Waunakee | 126 | Dane County |
| Inspire Early Childhood Original | WI1134331 | NTNCWS | Waunakee | 303 | Dane County |
| Intercon Energy Services | WI1131320 | NTNCWS | Long Lake | 50 | Dane County |
| Interlaken Resort And Village | WI2650143 | CWS | Lake Geneva | 500 | Walworth County |
| International Foundation Of Employee Benefit | WI2680483 | NTNCWS | Brookfield | 155 | Waukesha County |
| Iola Waterworks | WI4690394 | CWS | Iola | 1,249 | Waupaca County |
| Iowa Grant Schools | WI1250165 | NTNCWS | Livingston | 730 | Iowa County |
| Iron Belt Waterworks | WI8260118 | CWS | Iron Belt | 211 | Iron County |
| Iron Oak Energy Wyeville Dry Plant | WI6420800 | NTNCWS | Tomah | 39 | Monroe County |
| Iron Oak Energy Wyeville Plant | WI6420799 | NTNCWS | Tomah | 39 | Monroe County |
| Iron Oak Energy Wyeville Wet Plant | WI6420920 | NTNCWS | Tomah | 65 | Monroe County |
| Iron Ridge Waterworks | WI1140150 | CWS | Iron Ridge | 937 | Dodge County |
| Iron River Sanitary District | WI8040131 | CWS | Iron River | 600 | Bayfield County |
| Ironton Waterworks | WI1570849 | CWS | Lavalle | 253 | Sauk County |
| Island Estates | WI6320638 | CWS | Lacrosse | 50 | La Crosse County |
| Ithaca Public School - Gym | WI1530306 | NTNCWS | Richland Center | 235 | Richland County |
| Ithaca Public School K-12 | WI1530305 | NTNCWS | Richland Center | 700 | Richland County |
| Itw Shakeproof Group - North System | WI1140585 | NTNCWS | Watertown | 65 | Dodge County |
| Itw Shakeproof Group - South System | WI1141071 | NTNCWS | Watertown | 65 | Dodge County |
| Ixonia Bank | WI1281161 | NTNCWS | Ixonia | 114 | Jefferson County |
| Ixonia Elementary School | WI1280334 | NTNCWS | Oconomowoc | 310 | Jefferson County |
| J J Keller North Park Office | WI4711007 | NTNCWS | Neenah | 90 | Winnebago County |
| J J Keller Vinland Plant | WI4710968 | NTNCWS | Neenah | 520 | Winnebago County |
| J V Kids Llc | WI4310134 | NTNCWS | Casco | 45 | Kewaunee County |
| Jamestown East Condominium Owners Association | WI2670580 | CWS | West Bend | 153 | Washington County |
| Jensen Metal Products | WI2521405 | NTNCWS | Racine | 80 | Racine County |
| Jim Falls Elem School 1 | WI6090709 | NTNCWS | Chippewa Falls | 113 | Chippewa County |
| Joe Van Horn Chevrolet | WI4600618 | NTNCWS | Plymouth | 100 | Sheboygan County |
| Johnson Creek Waterworks | WI1280107 | CWS | Johnson Creek | 3,318 | Jefferson County |
| Johnsonville Countryside Complex | WI4600905 | NTNCWS | Sheboygan Falls | 410 | Sheboygan County |
| Johnsonville Global Headquarters Office | WI4601159 | NTNCWS | Sheboygan Falls | 175 | Sheboygan County |
| Johnsonville Meadowside Plant | WI4601158 | NTNCWS | Sheboygan Falls | 230 | Sheboygan County |
| Johnsonville Riverside Plant | WI4600615 | NTNCWS | Sheboygan Falls | 160 | Sheboygan County |
| Johnsonville Tech Center | WI4602129 | NTNCWS | Sheboygan Falls | 130 | Sheboygan County |
| Jorgensen Conveyors Inc | WI2460662 | NTNCWS | Mequon | 100 | Ozaukee County |
| Joyful Beginnings Academy | WI4451581 | NTNCWS | Hortonville | 120 | Outagamie County |
| Juda Public School | WI1230099 | NTNCWS | Juda | 310 | Green County |
| Junction City Waterworks | WI7500127 | CWS | Junction City | 416 | Portage County |
| Juneau Waterworks | WI1140058 | CWS | Juneau | 2,627 | Dodge County |
| K & S Manufacturing Bldg 1 | WI3280021 | NTNCWS | Ixonia | 76 | Jefferson County |
| K & S Manufacturing Bldg 2 & 3 | WI1281142 | NTNCWS | Ixonia | 30 | Jefferson County |
| Kansasville School | WI2520347 | NTNCWS | Kansasville | 122 | Racine County |
| Kar-Tech Inc | WI2686643 | NTNCWS | Delafield | 46 | Waukesha County |
| Kellnersville Waterworks | WI4360441 | CWS | Kellnersville | 301 | Manitowoc County |
| Kelsch Machine Corp | WI1133902 | NTNCWS | Belleville | 57 | Dane County |
| Kendall Waterworks | WI6420295 | CWS | Kendall | 458 | Monroe County |
| Kenilworth Subd | WI2460796 | CWS | Mequon | 120 | Ozaukee County |
| Kenosha Beef International & Birchwood Foods | WI2300248 | NTNCWS | Kenosha | 352 | Kenosha County |
| Kens Sports Inc | WI4451925 | NTNCWS | Kaukauna | 60 | Outagamie County |
| Kettle Moraine Correctional Institution | WI4600449 | CWS | Madison | 1,544 | Fond du Lac County, Sheboygan County |
| Kettle Moraine High School & Wales Elem School | WI2680376 | NTNCWS | Wales | 1,670 | Waukesha County |
| Kettle Moraine Lutheran Hs | WI2670300 | NTNCWS | Jackson | 821 | Washington County |
| Kettle Moraine Ymca - Holy Trinity Congregation | WI2670160 | NTNCWS | Newburg | 127 | Washington County |
| Kewaunee Solutions | WI4310169 | NTNCWS | Kewaunee | 206 | Kewaunee County |
| Kewaunee Waterworks | WI4310281 | CWS | Kewaunee | 2,848 | Kewaunee County |
| Keyes Lake Mobile Home Park | WI4190087 | CWS | Stevens Point | 30 | Florence County |
| Kid Central | WI8070187 | NTNCWS | Webster | 130 | Burnett County |
| Kids At Play Child Care Center | WI6630228 | NTNCWS | Stoddard | 85 | Vernon County |
| Kieler Sd No 1 | WI1220103 | CWS | Kieler | 560 | Grant County |
| Kikkoman Foods | WI2650327 | NTNCWS | Walworth | 170 | Walworth County |
| Kimberly-Clark Corporation Kcpx Facility | WI4711743 | NTNCWS | Neenah | 70 | Winnebago County |
| Kingston Cheese Co-Op | WI4240387 | NTNCWS | Cambria | 36 | Green Lake County |
| Kinnard Farms Site 1 | WI4310144 | NTNCWS | Casco | 32 | Kewaunee County |
| Kinnard Farms Site 2 | WI4310012 | NTNCWS | Casco | 25 | Kewaunee County |
| Klondike Cheese Co | WI1230053 | NTNCWS | Monroe | 135 | Green County |
| Knapp Waterworks | WI6170267 | CWS | Knapp | 486 | Dunn County |
| Knollcrest | WI2681104 | CWS | Middleton | 66 | Waukesha County |
| Knolls Water Cooperative | WI2300145 | CWS | Hinsdale | 400 | Kenosha County |
| Koehne Chevrolet-Gmc Inc | WI4380845 | NTNCWS | Marinette | 100 | Marinette County |
| Kohler Waterworks | WI4600444 | CWS | Kohler | 2,271 | Sheboygan County |
| Koshkonong Trails Charter School | WI1134287 | NTNCWS | Cambridge | 35 | Dane County |
| Kountry Aire Est Mhp I | WI7290127 | CWS | Colfax | 90 | Juneau County |
| Kountry Aire Est Mhp Ii | WI7290555 | CWS | Colfax | 25 | Juneau County |
| Kountry Aire Est Mhp Iii | WI7290294 | CWS | Colfax | 210 | Juneau County |
| Kreilkamp Trucking Inc | WI2671001 | NTNCWS | Allenton | 42 | Washington County |
| Kwik Trip #1013 | WI2670267 | NTNCWS | La Crosse | 2,253 | Washington County |
| La Crosse Estates Llc | WI6320319 | CWS | La Crosse | 351 | La Crosse County |
| La Farge Waterworks | WI6630258 | CWS | La Farge | 712 | Vernon County |
| La Valle Waterworks | WI1570113 | CWS | La Valle | 365 | Sauk County |
| Laclare Family Creamery | WI4201524 | NTNCWS | Malone | 59 | Fond du Lac County |
| Laconia Elementary School | WI4200520 | NTNCWS | Rosendale | 420 | Fond du Lac County |
| Laconia High School And Middle School | WI4200645 | NTNCWS | Rosendale | 620 | Fond du Lac County |
| Lactalis Usa Inc | WI7371477 | NTNCWS | Merrill | 65 | Marathon County |
| Lad Lake | WI2680195 | CWS | Dousman | 180 | Waukesha County |
| Ladysmith Waterworks | WI8550131 | CWS | Ladysmith | 3,184 | Rusk County |
| Lafayette Court | WI6090454 | CWS | Menomonie | 78 | Chippewa County |
| Lake Breeze Dairy Llc | WI4200339 | NTNCWS | Appleton | 30 | Fond du Lac County |
| Lake Como Sanitary Dist 1 | WI2651536 | CWS | Lake Geneva | 3,038 | Walworth County |
| Lake Country Apartments | WI2682229 | CWS | Mequon | 84 | Ozaukee County, Waukesha County |
| Lake Country Classical Academy East Campus | WI2684180 | NTNCWS | Oconomowoc | 410 | Waukesha County |
| Lake Country Nissan | WI2687085 | NTNCWS | Greenfield | 35 | Waukesha County |
| Lake Country School | WI2683609 | NTNCWS | Hartford | 623 | Waukesha County |
| Lake Delton Waterworks | WI1570664 | CWS | Lake Delton | 2,914 | Sauk County |
| Lake Denoon Middle School | WI2685652 | NTNCWS | Muskego | 825 | Waukesha County |
| Lake Drive Water Trust | WI2683440 | CWS | Waukesha | 500 | Waukesha County |
| Lake Forest Water Coop | WI1130232 | CWS | Madison | 400 | Dane County |
| Lake Geneva Country Club Clubhouse | WI2650256 | NTNCWS | Fontana | 125 | Eau Claire County, Walworth County |
| Lake Lawn Resort 3 Main Well | WI2650038 | NTNCWS | Delavan | 405 | Walworth County |
| Lake Meadows Water Trust | WI2680228 | CWS | Waukesha | 750 | Waukesha County |
| Lake Pointe Apts - Well 1 5320-5326 | WI1132499 | CWS | Mt Horeb | 60 | Dane County |
| Lake Pointe Apts - Well 2 5312-5318 | WI1132500 | CWS | Mt Horeb | 60 | Dane County |
| Lake Pointe/Marina Bay | WI1132557 | CWS | Mt Horeb | 50 | Dane County |
| Lake View Apts | WI2300061 | CWS | Kenosha | 30 | Kenosha County |
| Lakecrest Shores Llc | WI2300103 | CWS | Chicago | 88 | Kenosha County |
| Lakeland Sanitary Dist 1 | WI7440116 | CWS | Minocqua | 2,381 | Oneida County, Vilas County |
| Lakeland University | WI4600487 | CWS | Plymouth | 1,200 | Sheboygan County |
| Lakeland Village 1 | WI7440117 | CWS | Bloomfield Hills | 81 | Oneida County |
| Lakeland Village 2 | WI7440087 | CWS | Bloomfield Hills | 49 | Oneida County |
| Lakepoint Offices | WI2682409 | NTNCWS | Muskego | 285 | Waukesha County |
| Lakeside Development East & West Bldgs | WI2460970 | NTNCWS | Mequon | 88 | Ozaukee County |
| Lakeside Elementary School | WI4710601 | NTNCWS | Oshkosh | 300 | Winnebago County |
| Lakeside Estates | WI2670109 | CWS | Las Vegas | 54 | Washington County |
| Lakeside Mennonite School | WI4361354 | NTNCWS | Two Rivers | 36 | Manitowoc County |
| Lakeview Estates Mhp | WI4080268 | CWS | Stevens Point | 112 | Calumet County |
| Lakeview Heights Mobile Home Park | WI4310284 | CWS | Milwaukee | 66 | Kewaunee County |
| Lakeview School | WI2520248 | NTNCWS | Muskego | 480 | Racine County |
| Lakeview School | WI2650344 | NTNCWS | Whitewater | 200 | Walworth County |
| Lakeview Specialty Hospital | WI2520204 | NTNCWS | Waterford | 484 | Racine County |
| Lakewood Assisted Living Inc | WI4430208 | NTNCWS | De Pere | 50 | Oconto County |
| Lakewood School | WI2300564 | NTNCWS | Twin Lakes | 408 | Kenosha County |
| Lakewood Supervalu | WI4430369 | NTNCWS | Onalaska | 335 | Oconto County |
| Lakewood Village | WI1280109 | CWS | Bayside | 160 | Jefferson County, Oconto County |
| Lakewood Village Apts | WI2300940 | CWS | Kenosha | 125 | Kenosha County |
| Lakewoods Lodge | WI8040330 | NTNCWS | Cable | 25 | Bayfield County |
| Lamplighter Mhc Llc | WI4240221 | CWS | Green Lake | 80 | Green Lake County |
| Land O Lakes Inc Cheese Div | WI7370089 | NTNCWS | Spencer | 350 | Marathon County |
| Land O Lakes Sanitary Dist | WI7640112 | CWS | Land O Lakes | 450 | Vilas County |
| Land O Lakes- Animal Milk Solutions | WI7290672 | NTNCWS | Union Center | 36 | Juneau County |
| Lannon Water Utility | WI2686008 | CWS | Lannon | 172 | Waukesha County |
| Lannoye Elementary School | WI4050687 | NTNCWS | Pulaski | 330 | Brown County |
| Laona Sanitary Dist | WI7210108 | CWS | Laona | 950 | Forest County |
| Laser Excel | WI4240487 | NTNCWS | Green Lake | 31 | Green Lake County |
| Laurel Lakes 508 | WI2460150 | CWS | Milwaukee | 50 | Ozaukee County |
| Laurel Lakes 608 | WI2460137 | CWS | Milwaukee | 80 | Ozaukee County |
| Learning Depot | WI2651072 | NTNCWS | Whitewater | 80 | Walworth County |
| Lebanon Elementary School | WI1280330 | NTNCWS | Watertown | 105 | Dodge County |
| Lebanon Lutheran School - St Peters Bldg | WI1140184 | NTNCWS | Lebanon | 200 | Dodge County |
| Lee Precision Inc | WI3670033 | NTNCWS | Hartford | 95 | Washington County |
| Lejeune Steel Building 1 | WI6030112 | NTNCWS | Barronett | 100 | Barron County |
| Lejeune Steel Building 2 | WI6031223 | NTNCWS | Barronett | 100 | Barron County |
| Lena Waterworks | WI4430493 | CWS | Lena | 585 | Oconto County |
| Leroy Sanitary District 1 | WI1140155 | CWS | Mayville | 320 | Dodge County |
| Liberty Christian School | WI6090713 | NTNCWS | Chippewa Falls | 75 | Chippewa County |
| Lignetics Of Great Lakes Llc | WI8580194 | NTNCWS | Louisville | 30 | Sawyer County |
| Lily Meadows Assisted Living | WI4390175 | CWS | Westfield | 50 | Marquette County |
| Lincoln Crest Apartments | WI2301743 | CWS | Oak Creek | 32 | Kenosha County |
| Lincoln Hills School | WI7350121 | CWS | Irma | 316 | Lincoln County |
| Lincoln Tn Of Sd 1 | WI6620579 | CWS | Whitehall | 300 | Trempealeau County |
| Lincolnshire Place | WI2686481 | CWS | Pewaukee | 100 | Waukesha County |
| Linden Lane Apts 117 | WI2460142 | CWS | Saukville | 90 | Ozaukee County |
| Linden Lane Apts 141 | WI2460154 | CWS | Milwaukee | 75 | Ozaukee County |
| Linden Waterworks | WI1250082 | CWS | Linden | 547 | Iowa County |
| Lindgren Rf Enclosure Inc | WI7440099 | NTNCWS | Cedar Park | 50 | Oneida County |
| Little Acorns Lodge Learning Academy | WI7640020 | NTNCWS | St Germain | 30 | Vilas County |
| Little Dumplings Early Learning Center | WI2680488 | NTNCWS | Oconomowoc | 258 | Waukesha County |
| Little Explorers Preschool | WI1133607 | NTNCWS | Madison | 245 | Dane County |
| Little Florida | WI7350124 | CWS | Boca Raton | 170 | Lincoln County |
| Little Hands Child Care & Napa Auto Parts | WI2671644 | NTNCWS | Slinger | 55 | Washington County |
| Little Owls Child Care Center | WI4602225 | NTNCWS | Sheboygan | 50 | Fond du Lac County, Sheboygan County |
| Little Red School House | WI2460218 | NTNCWS | Kewaskum | 75 | Ozaukee County |
| Little Red Schoolhouse Colgate | WI2671652 | NTNCWS | Kewaskum | 70 | Washington County |
| Little Sunshines Learning Center Ii | WI7440846 | NTNCWS | Three Lakes | 78 | Oneida County |
| Little Toes Daycare Center | WI6270643 | NTNCWS | Alma Center | 35 | Jackson County |
| Little Vip Child Care | WI2520244 | NTNCWS | Wind Lake | 120 | Racine County |
| Livingston Waterworks | WI1220109 | CWS | Livingston | 664 | Grant County |
| Lkq Smart Parts | WI1140423 | NTNCWS | Hustisford | 85 | Dodge County |
| Lodi Waterworks | WI1110100 | CWS | Lodi | 3,146 | Columbia County |
| Loganville Waterworks | WI1570092 | CWS | Loganville | 300 | Sauk County |
| Lomira Waterworks | WI1140151 | CWS | Lomira | 2,701 | Dodge County |
| Lone Rock Waterworks | WI1530061 | CWS | Lone Rock | 895 | Richland County |
| Lotus Light | WI2301403 | NTNCWS | Silver Lake | 50 | Kenosha County |
| Lotus Light 2 | WI2301941 | NTNCWS | Silver Lake | 25 | Kenosha County |
| Louisiana Pacific Corporation | WI8581005 | NTNCWS | Hayward | 220 | Sawyer County |
| Loves Travel Stop - Sheboygan | WI4602143 | NTNCWS | Oklahoma City | 2,070 | Sheboygan County |
| Loves Travel Stops Poynette | WI1110969 | NTNCWS | Oklahoma City | 1,051 | Columbia County |
| Lowe Manufacturing | WI1530160 | NTNCWS | Hustisford | 33 | Richland County |
| Lowell Waterworks | WI1140152 | CWS | Lowell | 337 | Dodge County |
| Lowenstine Fund Corporation | WI7641621 | CWS | Land O Lakes | 120 | Vilas County |
| Lower Dells Mhc | WI1570086 | CWS | Boca Raton | 75 | Sauk County |
| Loyal Waterworks | WI6100329 | CWS | Loyal | 1,308 | Clark County |
| Lp Building Solutions Green Bay | WI4052765 | NTNCWS | Green Bay | 112 | Brown County |
| Luck Waterworks | WI6490338 | CWS | Luck | 1,150 | Polk County |
| Ludwell Estates | WI2650157 | CWS | Elkhorn | 100 | Walworth County |
| Luedtkes Mobile Home Park | WI8580537 | CWS | Hayward | 50 | Sawyer County |
| Luxemburg Waterworks | WI4310282 | CWS | Luxemburg | 2,737 | Kewaunee County |
| Lynch Truck Center | WI2521268 | NTNCWS | Waterford | 50 | Racine County |
| Lyndon Station Waterworks | WI7290124 | CWS | Lyndon Station | 474 | Juneau County |
| Lynn Dairy Inc | WI6100275 | NTNCWS | Granton | 100 | Clark County |
| Madison Community Montessori School | WI1133858 | NTNCWS | Middleton | 200 | Dane County |
| Madison Country Day School | WI1130558 | NTNCWS | Waunakee | 660 | Dane County |
| Magee Elementary | WI2680928 | NTNCWS | Wales | 403 | Waukesha County |
| Maiden Rock Water Utility | WI6480240 | CWS | Maiden Rock | 118 | Pierce County |
| Maine Elementary School | WI7370467 | NTNCWS | Wausau | 255 | Marathon County |
| Maine Water Utility | WI7370107 | CWS | Wausau | 271 | Marathon County |
| Maizefield Mhc (Manufactured Home Community) | WI7370157 | CWS | Stevens Point | 145 | Marathon County |
| Manawa Waterworks | WI4690345 | CWS | Manawa | 1,300 | Waupaca County |
| Manheim Milwaukee Auto Auction House & Detail Shop | WI2522355 | NTNCWS | Caledonia | 240 | Racine County |
| Manheim Milwaukee Auto Auction-New Body Shop | WI2521433 | NTNCWS | Caledonia | 25 | Racine County |
| Manitou Falls Sanitary District No 1 | WI8160145 | CWS | Superior | 95 | Douglas County |
| Manor Hill Mobile Home Park | WI4200462 | CWS | Farmington Hills | 400 | Fond du Lac County |
| Maple Bluff Waterworks | WI1130234 | CWS | Madison | 1,342 | Dane County |
| Maple Grove Charter School | WI7370468 | NTNCWS | Athens | 100 | Marathon County |
| Maple Grove Mhp | WI1140135 | CWS | Beaver Dam | 125 | Dodge County |
| Maple Leaf Dairy Inc East | WI4361421 | NTNCWS | Cleveland | 28 | Manitowoc County |
| Maple Leaf Dairy Inc West | WI4360868 | NTNCWS | Cleveland | 40 | Manitowoc County |
| Maple Park Condominiums | WI1570099 | CWS | Prairie Du Sac | 150 | Sauk County |
| Maple Plain | 055295901 | CWS | Webster | 144 | Polk County |
| Maple Terrace Mhc | WI2670107 | CWS | Barrington | 124 | Washington County |
| Maplewood Meats | WI4052389 | NTNCWS | Green Bay | 100 | Brown County |
| Maplewood Sanitary Dist 1 | WI4150064 | CWS | Maplewood | 122 | Door County |
| Maplewood Village | WI4450421 | CWS | Bayside | 225 | Outagamie County |
| Maranatha Academy Inc | WI8160218 | NTNCWS | Superior | 132 | Douglas County |
| Marathon City Waterworks | WI7370151 | CWS | Marathon City | 1,695 | Marathon County |
| Maravilla Montessori School | WI2680621 | NTNCWS | Waukesha | 55 | Waukesha County |
| Marawood Well 1 | WI6100909 | NTNCWS | Marshfield | 50 | Clark County |
| Marell Country Estates | WI6170265 | CWS | Elk Mound | 150 | Dunn County |
| Marell Courts And Rentals Llc | WI6630256 | CWS | Hillsboro | 60 | Juneau County, Vernon County |
| Marengo Valley School | WI8020469 | NTNCWS | Ashland | 220 | Ashland County |
| Marian Heights Subdivision | WI2680203 | CWS | Elm Grove | 400 | Waukesha County |
| Maribel Waterworks | WI4360429 | CWS | Maribel | 355 | Manitowoc County |
| Marion Waterworks | WI4690396 | CWS | Marion | 1,293 | Waupaca County |
| Markesan Waterworks | WI4240218 | CWS | Markesan | 1,365 | Green Lake County |
| Marlan Meadows Homeowners Assoc | WI2680224 | CWS | Muskego | 210 | Waukesha County |
| Marshview Terrace | WI1140156 | CWS | Stevens Point | 40 | Dodge County |
| Mary Hill Park Sanitary Dist | WI4200465 | CWS | Fond Du Lac | 65 | Fond du Lac County |
| Maryville Sd 2 | WI1220105 | CWS | Hazel Green | 100 | Grant County |
| Mater Dei Catholic Parish | WI4240139 | NTNCWS | Berlin | 302 | Green Lake County |
| Matsche Farms Inc | WI4590283 | NTNCWS | Birnamwood | 79 | Shawano County |
| Matthias Academy | WI2302358 | NTNCWS | Bristol | 94 | Kenosha County |
| Mattoon Waterworks | WI4590455 | CWS | Mattoon | 450 | Shawano County |
| Mazomanie Mhp | WI1130240 | CWS | Cedaredge | 85 | Dane County |
| Mazomanie Waterworks | WI1130239 | CWS | Mazomanie | 1,744 | Dane County |
| Mbe Cpas | WI1570311 | NTNCWS | Baraboo | 61 | Sauk County |
| Mccain Foods Usa | WI7500100 | NTNCWS | Wisconsin Rapids | 450 | Portage County |
| Mcdonalds Milw St | WI1131439 | NTNCWS | Poynette | 1,940 | Dane County |
| Mcdonalds Newville | WI1540964 | NTNCWS | Edgerton | 1,085 | Rock County |
| Mcdonalds Restaurant Poynette | WI1110375 | NTNCWS | Poynette | 845 | Columbia County |
| Mcdonalds Vernon | WI2682450 | NTNCWS | Waukesha | 1,250 | Waukesha County |
| Mcdonalds Westfield | WI4390628 | NTNCWS | Onalaska | 1,040 | Marquette County |
| Mckay Center | WI1131341 | NTNCWS | Madison | 250 | Dane County |
| Mckay Nursery Corporate Hdqtrs | WI1280004 | NTNCWS | Waterloo | 55 | Jefferson County |
| Mcnaughton Correctional Center | WI7440115 | CWS | Lake Tomahawk | 133 | Oneida County |
| Meadowbrook Mobile Home Park | WI4390542 | CWS | Stevens Point | 39 | Marquette County |
| Meadows Condominiums Assoc Ltd | WI2413464 | CWS | Franklin | 50 | Milwaukee County |
| Meadowview Village Apts | WI2300172 | CWS | Lacrosse | 48 | Kenosha County, La Crosse County |
| Medford Mhp Llc | WI8610411 | CWS | Medford | 51 | Taylor County |
| Mellen Water Utility | WI8020378 | CWS | Mellen | 731 | Ashland County |
| Melrose Mindoro United Campus | WI6270392 | NTNCWS | Melrose | 800 | Jackson County |
| Melrose Mindoro Vocational School | WI6270578 | NTNCWS | Melrose | 200 | Jackson County |
| Melrose Waterworks | WI6270293 | CWS | Melrose | 524 | Jackson County |
| Menards Dist Center North | WI6181118 | NTNCWS | Eau Claire | 100 | Eau Claire County |
| Menards Distribution Center Office | WI6180675 | NTNCWS | Eau Claire | 200 | Eau Claire County |
| Menards General Office | WI6180676 | NTNCWS | Eau Claire | 50 | Eau Claire County |
| Menards Old Mill Center | WI6180356 | NTNCWS | Eau Claire | 730 | Eau Claire County |
| Mendota Mental Health Inst | WI1130235 | CWS | Madison | 2,787 | Dane County |
| Menomonee Falls Ww - Groundwater | WI2685747 | CWS | Menomonee Falls | 1,796 | Waukesha County |
| Mequon Colony Estates | WI2460132 | CWS | Mequon | 75 | Ozaukee County |
| Mequon Office Complex 11514 Bldg | WI2460712 | NTNCWS | Mequon | 100 | Ozaukee County |
| Mequon Office Complex 11516 Bldg | WI2460289 | NTNCWS | Mequon | 100 | Ozaukee County |
| Mequon On The Square Condominium Owners Association Inc | WI2460955 | CWS | Mequon | 110 | Ozaukee County |
| Mequon Parc Apartments Llc | WI2460159 | CWS | Mequon | 60 | Ozaukee County |
| Mequon Retail Ii Llc | WI2460870 | NTNCWS | Whitefish Bay | 75 | Ozaukee County |
| Mequon Trail Townhomes | WI2460817 | CWS | Mequon | 615 | Ozaukee County |
| Mequon Umc & North Shore Preschool | WI2460208 | NTNCWS | Mequon | 174 | Ozaukee County |
| Mequon Water Trust | WI2460131 | CWS | Mequon | 26 | Ozaukee County |
| Mercer Sanitary District | WI8260120 | CWS | Mercer | 760 | Iron County |
| Mercury Racing | WI4200588 | NTNCWS | Fond Du Lac | 132 | Fond du Lac County |
| Merrillan Waterworks | WI6270294 | CWS | Merrillan | 531 | Jackson County |
| Merrimac Estates Mhp | WI1570094 | CWS | Merrimac | 37 | Sauk County |
| Merrimac Waterworks | WI1570093 | CWS | Merrimac | 440 | Sauk County |
| Merton Intermediate & Primary School | WI2680713 | NTNCWS | Merton | 1,130 | Waukesha County |
| Metallics Incorporated | WI6320431 | NTNCWS | Onalaska | 190 | La Crosse County |
| Meyer Utility Structures Llc | WI6480202 | NTNCWS | Hager City | 225 | Pierce County |
| Mga Research Corp | WI2650176 | NTNCWS | Burlington | 38 | Walworth County |
| Michels Corporation - Franksville | WI2522916 | NTNCWS | Brownsville | 50 | Racine County |
| Mid America Steel Drum Inc | WI2410212 | NTNCWS | Oak Creek | 54 | Milwaukee County |
| Mid State Power & Equipment | WI1110453 | NTNCWS | Columbus | 52 | Columbia County |
| Mid-State Equipment Janesville | WI1540609 | NTNCWS | Janesville | 50 | Rock County |
| Mid-State Supply | WI4700779 | NTNCWS | Wautoma | 38 | Waushara County |
| Middle River Health And Rehab Center | WI8160143 | CWS | South Range | 200 | Douglas County |
| Middle Village | 055295507 | CWS | Keshena | 310 | Shawano County |
| Midway Village Mobile Home Park | WI1540124 | CWS | Cedaredge | 160 | Rock County |
| Midwest Veterinary Supply | WI1133906 | NTNCWS | Sun Prairie | 86 | Dane County |
| Milk Specialties Global Company Dba Actus Nutrition | WI1220159 | NTNCWS | Eden Prairie | 45 | Grant County |
| Mill Creek Academy | WI2686962 | NTNCWS | Se Grand Rapids | 886 | Waukesha County |
| Mill Valley School | WI2680812 | NTNCWS | Muskego | 426 | Waukesha County |
| Milladore Waterworks | WI7720994 | CWS | Milladore | 280 | Wood County |
| Miller Brothers Partnership | WI2522538 | NTNCWS | Big Bend | 100 | Racine County |
| Milltown Waterworks | WI6490339 | CWS | Milltown | 915 | Polk County |
| Miltrim Farms Inc | WI7372596 | NTNCWS | Athens | 65 | Marathon County |
| Mineral Point Waterworks | WI1250084 | CWS | Mineral Point | 2,487 | Iowa County |
| Minocqua Hazelhurst Elem Sch | WI7440657 | NTNCWS | Minocqua | 650 | Oneida County |
| Minong Waterworks | WI8660303 | CWS | Minong | 561 | Washburn County |
| Mishicot Waterworks | WI4360430 | CWS | Mishicot | 1,432 | Manitowoc County |
| Mission Lakes Ii | WI2685839 | CWS | Milwaukee | 68 | Waukesha County |
| Mole Lake | 055295601 | CWS | Crandon | 1,260 | Forest County |
| Mondovi Waterworks | WI6060193 | CWS | Mondovi | 2,667 | Buffalo County |
| Montello Waterworks | WI4390281 | CWS | Montello | 1,329 | Marquette County |
| Montfort Waterworks | WI1220110 | CWS | Montfort | 718 | Grant County, Iowa County |
| Monticello Waterworks | WI1230083 | CWS | Monticello | 1,217 | Green County |
| Montreal Waterworks | WI8260121 | CWS | Montreal | 887 | Iron County |
| Mosinee East System | WI7372480 | CWS | Mosinee | 1,046 | Marathon County |
| Mosinee Waterworks | WI7370159 | CWS | Mosinee | 3,406 | Marathon County |
| Mother Goose Family Daycare Center | WI4691049 | NTNCWS | Clintonville | 66 | Waupaca County |
| Mount Calvary Waterworks | WI4200474 | CWS | Mt Calvary | 478 | Fond du Lac County |
| Mount Hope Waterworks | WI1220111 | CWS | Mount Hope | 181 | Grant County |
| Mount Sterling Waterworks | WI6120246 | CWS | Mt Sterling | 206 | Crawford County |
| Mountain Top Christian Academy | WI1140869 | NTNCWS | Horicon | 207 | Dodge County |
| Mountain View Mhp 1 | WI1540121 | CWS | Evansville | 50 | Rock County |
| Mountain View Mhp 2 | WI1541112 | CWS | Evansville | 25 | Rock County |
| Msi Express Inc | WI4200517 | NTNCWS | Rosendale | 154 | Fond du Lac County |
| Mueller Sports Medicine | WI1570585 | NTNCWS | Prairie Du Sac | 100 | Sauk County |
| Mullins Cheese | WI7371909 | NTNCWS | Mosinee | 40 | Marathon County |
| Mullins Cheese Factory | WI7371905 | NTNCWS | Mosinee | 200 | Marathon County |
| Muscoda Waterworks | WI1220112 | CWS | Muscoda | 1,453 | Grant County |
| Muskego Lake Aire Apartments | WI2680218 | CWS | Oconomowoc | 35 | Waukesha County |
| N & M Transfer Company Well 2 | WI4711241 | NTNCWS | Neenah | 50 | Winnebago County |
| N & M Transfer Company Well 3 | WI4711549 | NTNCWS | Neenah | 175 | Winnebago County |
| Nashotah House | WI2682512 | CWS | Delafield | 350 | Waukesha County |
| Nasonville Dairy | WI7721443 | NTNCWS | Marshfield | 145 | Wood County |
| Nasonville Elementary School | WI7720425 | NTNCWS | Marshfield | 350 | Wood County |
| Natural Beauty Growers | WI4310486 | NTNCWS | Denmark | 120 | Kewaunee County |
| Natural Ovens Bakery Alpha Baking Co | WI4360770 | NTNCWS | Manitowoc | 150 | Manitowoc County |
| Natures Classroom Institute Property Llc | WI2686655 | NTNCWS | Mukwonago | 40 | Waukesha County |
| Necedah Waterworks | WI7290130 | CWS | Necedah | 844 | Juneau County |
| Nedland Industries | WI6170254 | NTNCWS | Ridgeland | 45 | Dunn County |
| Neenk Chunk Gra Head Start | WI1571189 | NTNCWS | Black River Falls | 26 | Sauk County |
| Neillsville Waterworks | WI6100330 | CWS | Neillsville | 2,384 | Clark County |
| Nekoosa Waterworks | WI7720169 | CWS | Nekoosa | 2,394 | Wood County |
| Nelson Water & Sewer Dept | WI6060232 | CWS | Nelson | 375 | Buffalo County |
| Neopit | 055295510 | CWS | Keshena | 1,162 | Menominee County |
| Nestle Purina Pet Care Co | WI6480353 | NTNCWS | Hager City | 55 | Pierce County |
| New Auburn Waterworks | WI6090461 | CWS | New Auburn | 549 | Chippewa County |
| New Chester Dairy | WI7010347 | NTNCWS | Kaukauna | 75 | Adams County |
| New Frontiers Preschool | WI2461607 | NTNCWS | Fox Point | 152 | Ozaukee County |
| New Glarus Waterworks | WI1230084 | CWS | New Glarus | 2,348 | Green County |
| New Holstein Waterworks | WI4080270 | CWS | New Holstein | 3,012 | Calumet County, Fond du Lac County |
| New House Richland | WI1530208 | NTNCWS | Richland Center | 265 | Richland County |
| New Lisbon Waterworks | WI7290132 | CWS | New Lisbon | 2,526 | Juneau County |
| New Odanah | 055295102 | CWS | Odanah | 1,839 | Ashland County |
| New Post | 055295301 | CWS | Hayward | 150 | Sawyer County |
| New Richmond Estates | WI6560131 | CWS | Colfax | 95 | St. Croix County |
| New World Montessori School | WI2461305 | NTNCWS | Mequon | 96 | Ozaukee County |
| Niagara Waterworks | WI4380439 | CWS | Niagara | 1,561 | Marinette County |
| Nichols Waterworks | WI4450414 | CWS | Nichols | 275 | Outagamie County |
| Nicolet Plastics Llc | WI4430004 | NTNCWS | Mountain | 80 | Oconto County |
| Nigrelli Inc | WI4360750 | NTNCWS | Kiel | 45 | Manitowoc County |
| Nlc Energy Denmark | WI4052482 | NTNCWS | Denmark | 270 | Brown County |
| Nonns Flooring Warehouse | WI1134105 | NTNCWS | Dane | 35 | Dane County |
| Nor Lake | WI6560111 | NTNCWS | Hudson | 250 | St. Croix County |
| Norman Office Building C | WI1530311 | NTNCWS | Richland Center | 87 | Richland County |
| Norris Inc | WI2680246 | CWS | Mukwonago | 141 | Waukesha County |
| Norscot Group Inc | WI2460334 | NTNCWS | Mequon | 100 | Ozaukee County |
| Norswiss Farms Inc | WI6030024 | NTNCWS | Rice Lake | 31 | Barron County |
| North Cape School | WI2520181 | NTNCWS | Franksville | 170 | Racine County |
| North Country Montessori | WI7441615 | NTNCWS | Minocqua | 33 | Oneida County |
| North Crawford School | WI6120376 | NTNCWS | Soldiers Grove | 525 | Crawford County |
| North Freedom Waterworks | WI1570096 | CWS | North Freedom | 589 | Sauk County |
| North Hills Mhp | WI1140439 | CWS | Barrington | 420 | Dodge County |
| North Lake School | WI2680467 | NTNCWS | North Lake | 450 | Waukesha County |
| North Lake Village | WI4451167 | CWS | Appleton | 44 | Outagamie County |
| North Lakeland School | WI7640801 | NTNCWS | Manitowish Waters | 145 | Vilas County |
| North Shore Preschool & Child Care | WI2461306 | NTNCWS | Mequon | 72 | Ozaukee County |
| Northern Clearing Inc | WI8040783 | NTNCWS | Ashland | 33 | Bayfield County |
| Northern Family Farms Mexicali Housing Well | WI6270635 | CWS | Merrillan | 60 | Jackson County |
| Northernaire Sanitary District | WI7440812 | CWS | Three Lakes | 315 | Oneida County |
| Northfield San Dist 1 | WI6270004 | CWS | Hixton | 50 | Jackson County |
| Northland Mission | WI4380440 | CWS | Dunbar | 75 | Marinette County |
| Northview Elementary School | WI4600724 | NTNCWS | Howards Grove | 435 | Sheboygan County |
| Northwestern Elementary And Middle School | WI8160233 | NTNCWS | Maple | 890 | Douglas County |
| Northwestern High School | WI8160201 | NTNCWS | Maple | 448 | Douglas County |
| Northwood Community Elementary School | WI7440656 | NTNCWS | Rhinelander | 102 | Oneida County |
| Northwood School | WI8660738 | NTNCWS | Minong | 350 | Washburn County |
| Northwoods Child Development Center | WI7641091 | NTNCWS | Eagle River | 65 | Vilas County |
| Northwoods Inc Of Wisconsin | WI1110202 | NTNCWS | Portage | 180 | Columbia County |
| Norwalk Waterworks | WI6420296 | CWS | Norwalk | 653 | Monroe County |
| Norway Ev Lutheran Church And Mustard Seed Preschool | WI2520249 | NTNCWS | Wind Lake | 345 | Racine County |
| Norwood Inn | WI6320446 | NTNCWS | La Crosse | 200 | La Crosse County |
| Nrf Viii - Autumn Grove Llc | WI2686152 | NTNCWS | Skokie | 578 | Waukesha County |
| Ntc Ag Center | WI7372590 | NTNCWS | Wausau | 225 | Marathon County |
| Ntc Christian Academy | WI7350614 | NTNCWS | Merrill | 157 | Lincoln County |
| Ntc Epdp Building | WI7372678 | NTNCWS | Wausau | 30 | Marathon County |
| Ntc Vet Tech Lab | WI7372591 | NTNCWS | Wausau | 115 | Marathon County |
| Nu Roc Health And Rehabilitation Center | WI7210105 | CWS | Laona | 86 | Forest County |
| Oak Lane Mobile Home Park | WI7500146 | CWS | Stevens Point | 60 | Portage County |
| Oak Park Community | WI1220095 | CWS | Dickeyville | 90 | Grant County |
| Oak Ridge Mobile Com 1 & 2 | WI1280101 | CWS | Farmington Hills | 133 | Jefferson County |
| Oak Ridge Mobile Com 3 | WI1280829 | CWS | Farmington Hills | 58 | Jefferson County |
| Oak Ridge Mobile Com 4 | WI1281056 | CWS | Farmington Hills | 60 | Jefferson County |
| Oak Tree Early Learning Center Llc | WI7641114 | NTNCWS | Arbor Vitae | 116 | Vilas County |
| Oakdale Estates Mhp | WI2300177 | CWS | Sturtevant | 220 | Kenosha County, Racine County |
| Oakdale Waterworks | WI6420069 | CWS | Oakdale | 317 | Monroe County |
| Oakfield Waterworks | WI4200475 | CWS | Oakfield | 1,058 | Fond du Lac County |
| Oakhill Correctional Inst | WI1130250 | CWS | Oregon | 1,096 | Dane County |
| Oakhill Waterworks | WI1540116 | CWS | Edgerton | 130 | Rock County |
| Oaks The | WI4150213 | CWS | Egg Harbor | 135 | Door County |
| Oakton Beach | WI2681086 | CWS | Hales Corners | 144 | Milwaukee County, Waukesha County |
| Oakwood Estates Mhp | WI4690397 | CWS | New London | 110 | Waupaca County |
| Oakwood Terrace | WI1110104 | CWS | Farmington Hills | 100 | Columbia County |
| Obrien Steel | WI7370427 | NTNCWS | Wausau | 108 | Marathon County |
| Ocean Spray Cranberry Inc | WI6420164 | NTNCWS | Tomah | 75 | Monroe County |
| Ocean Spray Cranberry Inc | WI7720346 | NTNCWS | Babcock | 25 | Wood County |
| Oconto Falls Mhp | WI4430504 | CWS | Cedaredge | 80 | Oconto County |
| Oconto Falls Waterworks | WI4430496 | CWS | Oconto Falls | 2,892 | Oconto County |
| Oh Snap Pickling Co | WI4452038 | NTNCWS | Appleton | 118 | Outagamie County |
| Ontario Waterworks | WI6630259 | CWS | Ontario | 554 | Vernon County |
| Onward Adc | WI4201642 | NTNCWS | Rosendale | 56 | Fond du Lac County |
| Oostburg Waterworks | WI4600445 | CWS | Oostburg | 3,110 | Sheboygan County |
| Orfordville Waterworks | WI1540132 | CWS | Orfordville | 1,475 | Rock County |
| Ornua Ingredients North America | WI4080227 | NTNCWS | Hilbert | 250 | Calumet County |
| Orthopaedic Associates | WI2686480 | NTNCWS | Pewaukee | 709 | Waukesha County |
| Osceola Waterworks | WI6490341 | CWS | Osceola | 2,680 | Polk County |
| Osprey Mobile Home Park | WI2460113 | CWS | Las Vegas | 150 | Ozaukee County |
| Osseo Waterworks | WI6620328 | CWS | Osseo | 1,701 | Trempealeau County |
| Our Lady Of Good Success Academy | WI4052555 | NTNCWS | De Pere | 45 | Brown County |
| Our Lady Of The Holyland Parish St John Site | WI4200647 | NTNCWS | Malone | 234 | Fond du Lac County |
| Owen Mennonite Church & School | WI6100031 | NTNCWS | Colby | 145 | Clark County |
| Owen Waterworks | WI6100334 | CWS | Owen | 936 | Clark County |
| Oxford Elementary | WI4390310 | NTNCWS | Westfield | 240 | Marquette County |
| Ozaukee Christian School | WI2671808 | NTNCWS | West Bend | 73 | Washington County |
| Ozaukee Daycare Center - Ulao 2 | WI2461592 | NTNCWS | Mequon | 98 | Ozaukee County |
| Pack Air Inc | WI4710855 | NTNCWS | Neenah | 50 | Winnebago County |
| Paddock Lake Waterworks | WI2300146 | CWS | Salem | 945 | Kenosha County |
| Pagels Ponderosa Dairy Llc | WI4310013 | NTNCWS | Kewaunee | 35 | Kewaunee County |
| Pantheon Industries Inc | WI2680716 | NTNCWS | Nashotah | 115 | Waukesha County |
| Pardeeville Waterworks | WI1110049 | CWS | Pardeeville | 2,151 | Columbia County |
| Paris School | WI2300246 | NTNCWS | Kenosha | 300 | Kenosha County |
| Park Falls Waterworks | WI8510130 | CWS | Park Falls | 2,993 | Price County |
| Park Place Subdivision | WI2460066 | CWS | Mequon | 260 | Ozaukee County |
| Parkview Apartments | WI1280055 | CWS | Milwaukee | 45 | Jefferson County |
| Parquelynn Village | WI2680261 | CWS | Nashotah | 450 | Waukesha County |
| Parsons Of Eagle River Inc | WI7640849 | NTNCWS | Eagle River | 32 | Vilas County |
| Patch Grove Waterworks | WI1220113 | CWS | Patch Grove | 160 | Grant County |
| Patricia Lake Manufactured Housing Community | WI7440139 | CWS | Stevens Point | 56 | Oneida County |
| Patriot Park | WI1220114 | CWS | Waunakee | 80 | Grant County |
| Pearces Mobile Home Estates | WI7290126 | CWS | Sparta | 37 | Juneau County |
| Pelican Elementary School | WI7441166 | NTNCWS | Rhinelander | 353 | Oneida County |
| Pence Waterworks | WI8260122 | CWS | Pence | 191 | Iron County |
| Pepin Waterworks | WI6470141 | CWS | Pepin | 816 | Pepin County |
| Petersen Adventist School | WI1110492 | NTNCWS | Columbus | 68 | Columbia County |
| Petro Travel Plaza #403 | WI1110483 | NTNCWS | Westlake | 915 | Columbia County |
| Phelps Sanitary District | WI7640114 | CWS | Phelps | 550 | Vilas County |
| Phillips Waterworks | WI8510131 | CWS | Phillips | 1,473 | Price County |
| Phoenix Necedah Industrial Investors Llc | WI7290461 | NTNCWS | Milwaukee | 50 | Juneau County |
| Pick N Save | WI4700724 | NTNCWS | Milwaukee | 75 | Waushara County |
| Pierce-Pepin Cooperative Services | WI6480545 | NTNCWS | Ellsworth | 40 | Pierce County |
| Pigeon Falls Waterworks | WI6620329 | CWS | Pigeon Falls | 409 | Trempealeau County |
| Pilgrim Park Middle School | WI2681154 | NTNCWS | Elm Grove | 950 | Waukesha County |
| Pilgrim Place Office Park | WI2683518 | NTNCWS | Delafield | 90 | Waukesha County |
| Pine Breeze Main Parlor | WI4700220 | NTNCWS | Appleton | 26 | Waushara County |
| Pine Crest Resort 2-Upper Well | WI6630442 | CWS | Westby | 51 | Vernon County |
| Pine Edge Mhp | WI6180291 | CWS | Sandy | 300 | Eau Claire County |
| Pine Grove Villa | WI7501175 | CWS | Stevens Point | 75 | Portage County |
| Pine Haven Estates | WI1110112 | CWS | Pardeeville | 45 | Columbia County |
| Pine Island Estates | WI6100331 | CWS | Charles Town | 75 | Clark County |
| Pine Ridge Apts | WI1132627 | CWS | Madison | 45 | Dane County |
| Pine River School For Young Learners | WI7350305 | NTNCWS | Merrill | 145 | Lincoln County |
| Pine Valley Community Village | WI1530064 | CWS | Richland Center | 225 | Richland County |
| Pine Vista Mhp 1 | WI1110126 | CWS | Las Vegas | 60 | Columbia County |
| Pineland Park 1 | WI4700282 | CWS | Wild Rose | 60 | Waushara County |
| Pines Subdivision | WI2460982 | CWS | Waukesha | 200 | Ozaukee County |
| Pinnacle Dairies Llc | WI1230462 | NTNCWS | Rising City | 55 | Green County |
| Pioneer Centre | WI2680212 | CWS | Muskego | 140 | Waukesha County |
| Pioneer Estates Of Delavan | WI2650116 | CWS | Milwaukee | 400 | Walworth County |
| Pioneer Westfield High Sch | WI4390647 | NTNCWS | Westfield | 500 | Marquette County |
| Pirates Cove Mobile Home Community | WI1540118 | CWS | Madison | 25 | Dane County, Rock County |
| Pirco Mhp | WI7720851 | CWS | Wisconsin Rapids | 97 | Wood County |
| Pittsville Waterworks | WI7720112 | CWS | Pittsville | 800 | Wood County |
| Plain Waterworks | WI1570098 | CWS | Plain | 792 | Sauk County |
| Plainfield Waterworks | WI4700268 | CWS | Plainfield | 924 | Waushara County |
| Pleasant Prairie Mhp | WI2300117 | CWS | Oakdale | 35 | Kenosha County |
| Pleasant View Nursing Home | WI1230081 | CWS | Monroe | 260 | Green County |
| Plum City Care Center Nursing Home | WI6480372 | CWS | Plum City | 120 | Pierce County |
| Plum City Elementary School | WI6480349 | NTNCWS | Plum City | 125 | Pierce County |
| Plum City High School | WI6480350 | NTNCWS | Plum City | 160 | Pierce County |
| Plummer Concrete & Associates Inc | WI6480634 | NTNCWS | Ellsworth | 45 | Pierce County |
| Point Beach Nuclear Main | WI4360634 | NTNCWS | Two Rivers | 550 | Manitowoc County |
| Port Edwards Water Utility | WI7720113 | CWS | Port Edwards | 1,866 | Wood County |
| Port Wing Sanitary District | WI8040094 | CWS | Port Wing | 400 | Bayfield County |
| Potato King | WI6321289 | NTNCWS | La Crosse | 150 | La Crosse County |
| Potosi Waterworks | WI1220117 | CWS | Potosi | 718 | Grant County |
| Pound Waterworks | WI4380444 | CWS | Pound | 349 | Marinette County |
| Power Packer | WI4390413 | NTNCWS | Westfield | 30 | Marquette County |
| Poynette Mobile Estates | WI1110109 | CWS | Chicago | 150 | Columbia County |
| Poynette Waterworks | WI1110037 | CWS | Poynette | 2,520 | Columbia County |
| Prairie Apts 1 & 2 | WI2300486 | CWS | Kenosha | 150 | Kenosha County |
| Prairie Apts 3 & 4 | WI2300871 | CWS | Kenosha | 125 | Kenosha County |
| Prairie Farm Cub Care | WI6030247 | NTNCWS | Prairie Farm | 160 | Barron County |
| Prairie Farm High School | WI6030246 | NTNCWS | Prairie Farm | 350 | Barron County |
| Prairie Hill Waldorf School | WI2680969 | NTNCWS | Pewaukee | 300 | Waukesha County |
| Prairie Lake Estates Mhp | WI6030961 | CWS | Evansville | 25 | Barron County |
| Prairie Meadow Estates 1 | WI7720537 | CWS | Wausau | 50 | Wood County |
| Prairie Meadow Estates 2 | WI7720535 | CWS | Wausau | 25 | Wood County |
| Prairie View Elementary School | WI2680628 | NTNCWS | Mukwonago | 565 | Waukesha County |
| Prairie View Elementary School | WI6630336 | NTNCWS | Desoto | 150 | Vernon County |
| Prairie View Senior Living | WI6480345 | CWS | Hager City | 31 | Pierce County |
| Prairie Village Water Trust | WI2680277 | CWS | North Prairie | 2,100 | Waukesha County |
| Precision Pipeline | WI6181128 | NTNCWS | Eau Claire | 55 | Chippewa County, Eau Claire County |
| Premier Truck Group Of Eau Claire | WI6180853 | NTNCWS | Eau Claire | 35 | Eau Claire County |
| Premier Truck Group Of Roberts | WI6561068 | NTNCWS | Dallas | 55 | St. Croix County |
| Premold Corporation | WI3680110 | NTNCWS | Oconomowoc | 46 | Waukesha County |
| Prentice Waterworks | WI8510132 | CWS | Prentice | 660 | Price County |
| Preston Pines | WI7010114 | CWS | Oconomowoc | 38 | Adams County |
| Prime Core Inc | WI4690890 | NTNCWS | Waupaca | 40 | Waupaca County |
| Princeton Waterworks | WI4240219 | CWS | Princeton | 1,166 | Green Lake County |
| Priory The | WI6180281 | CWS | Eau Claire | 185 | Eau Claire County |
| Prototek Digital Manufacturing (Madison) Llc | WI1134233 | NTNCWS | Blue Mounds | 40 | Dane County |
| Provision Partners - Auburndale | WI7721601 | NTNCWS | Marshfield | 80 | Wood County |
| Pukall Lumber Plant Lnchrm | WI7640381 | NTNCWS | Arbor Vitae | 38 | Vilas County |
| Pw Lake View Estates Llc | WI2460162 | CWS | Grafton | 30 | Ozaukee County |
| Quad Graphics | WI1140401 | NTNCWS | Lomira | 1,550 | Dodge County |
| Quail Hollow Condos | WI2686359 | CWS | Delafield | 30 | Waukesha County |
| Quala Wash | WI2300119 | NTNCWS | Bristol | 50 | Kenosha County |
| Quality Liquid Feeds | WI1250384 | NTNCWS | Dodgeville | 49 | Iowa County |
| Quality Paint & Coatings Oshkosh | WI4711318 | NTNCWS | Oshkosh | 90 | Winnebago County |
| Quantum Dairy Llc | WI4690220 | NTNCWS | Weyauwega | 42 | Waupaca County |
| Quiet Country Community Assn | WI4360434 | CWS | Two Rivers | 90 | Manitowoc County |
| Radisson Waterworks | WI8580533 | CWS | Radisson | 241 | Sawyer County |
| Railside School | WI6100894 | NTNCWS | Unity | 40 | Clark County |
| Rainbow Lake Manor Mhp | WI2300166 | CWS | Tampa | 350 | Kenosha County |
| Randall School | WI2300719 | NTNCWS | Burlington | 658 | Kenosha County |
| Randolph Water Dept | WI1110125 | CWS | Randolph | 1,800 | Columbia County, Dodge County |
| Random Lake Waterworks | WI4600355 | CWS | Random Lake | 1,594 | Sheboygan County |
| Ravine Farms Hm Owners Assoc | WI2460124 | CWS | Mequon | 100 | Milwaukee County, Ozaukee County |
| Rawhide Boys Ranch Central Services | WI4690319 | NTNCWS | New London | 230 | Waupaca County |
| Rawhide Youth Homes | WI4690321 | CWS | New London | 92 | Waupaca County |
| Raymond School | WI2520272 | NTNCWS | Franksville | 497 | Racine County |
| Readfield Elementary School | WI4690595 | NTNCWS | New London | 150 | Waupaca County |
| Readstown Waterworks | WI6630261 | CWS | Readstown | 395 | Vernon County |
| Recreacres Mhc Llc | WI7500138 | CWS | West Covina | 320 | Portage County |
| Red Cedar Valley Estates Mhp | WI6030422 | CWS | Rice Lake | 80 | Barron County |
| Red Cliff North | 055295802 | CWS | Bayfield | 1,562 | Bayfield County |
| Red Wing | 055295505 | CWS | Keshena | 100 | |
| Redgranite Waterworks | WI4700269 | CWS | Redgranite | 2,019 | Waushara County |
| Reedsville Waterworks | WI4360431 | CWS | Reedsville | 1,200 | Manitowoc County |
| Reek School | WI2650247 | NTNCWS | Lake Geneva | 131 | Walworth County |
| Reeseville Waterworks | WI1140153 | CWS | Reeseville | 718 | Dodge County |
| Reflections Village | WI2671748 | CWS | Burlington | 165 | Washington County |
| Regency Court 225 & 245 | WI2682828 | NTNCWS | Brookfield | 50 | Waukesha County |
| Regency Court 275 | WI2681944 | NTNCWS | Oak Creek | 110 | Waukesha County |
| Rehlko Power Systems Security | WI4600503 | NTNCWS | Sheboygan | 750 | Sheboygan County |
| Residences On Main | WI2302061 | CWS | Kenosha | 26 | Kenosha County |
| Revela Foods | WI6100905 | NTNCWS | Colby | 283 | Clark County |
| Rewey Waterworks | WI1250086 | CWS | Rewey | 290 | Iowa County |
| Rhodes Well 1 | WI1110903 | NTNCWS | Columbus | 165 | Columbia County |
| Rhodes Well 2 | WI1110478 | NTNCWS | Columbus | 165 | Columbia County |
| Rhymes N Rainbows | WI6090804 | NTNCWS | Chippewa Falls | 50 | Chippewa County |
| Rib Lake Waterworks | WI8610126 | CWS | Rib Lake | 945 | Taylor County |
| Richco Structures Bldg 2 | WI4601509 | NTNCWS | Haven | 136 | Sheboygan County |
| Richco Structures Bldg 5 | WI4602119 | NTNCWS | Haven | 136 | Sheboygan County |
| Richfield Middle School | WI2670268 | NTNCWS | Richfield | 410 | Washington County |
| Richfield Plaza | WI2670330 | NTNCWS | Hubertus | 80 | Washington County |
| Richfield Square | WI2670394 | NTNCWS | Slinger | 155 | Washington County |
| Richland Center Intermediate School | WI1530126 | NTNCWS | Richland Center | 321 | Richland County |
| Richmond Estates | WI4590468 | CWS | Bonduel | 150 | Shawano County |
| Richmond School | WI2680712 | NTNCWS | Sussex | 533 | Waukesha County |
| Ridgeland | 055295704 | CWS | Oneida | 608 | Dunn County |
| Ridgeland Elementary School | WI6030417 | NTNCWS | Barron | 60 | Barron County, Dunn County |
| Ridgeway Waterworks | WI1250087 | CWS | Ridgeway | 690 | Iowa County |
| Riesterer & Schnell Chilton | WI4360675 | NTNCWS | Chilton | 35 | Manitowoc County |
| Riesterer & Schnell Hortonville | WI4451914 | NTNCWS | Chilton | 30 | Outagamie County |
| Riesterer And Schnell Inc Two Rivers | WI4361137 | NTNCWS | Chilton | 31 | Manitowoc County |
| Rimrock Road Neighborhood | WI1132759 | CWS | Fitchburg | 135 | Dane County |
| Rio Waterworks | WI1110111 | CWS | Rio | 1,095 | Columbia County |
| Ripon Truck Repair & Equipment Llc | WI4710985 | NTNCWS | Pickett | 42 | Winnebago County |
| Ripview Court 1 | WI1280121 | CWS | Cedaredge | 35 | Jefferson County |
| Ripview Court 2 | WI1280122 | CWS | Cedaredge | 31 | Jefferson County |
| Ripview Court 3 | WI1280123 | CWS | Cedaredge | 31 | Jefferson County |
| Ripview Court 4 | WI1280125 | CWS | Cedaredge | 35 | Jefferson County |
| River Centre East Well | WI2461382 | NTNCWS | Cedarburg | 199 | Ozaukee County |
| River Centre West Well | WI2460821 | NTNCWS | Cedarburg | 135 | Ozaukee County |
| River Cities High School | WI7720432 | NTNCWS | Wisconsin Rapids | 95 | Wood County |
| River Garden Apts | WI2460139 | CWS | Milwaukee | 25 | Ozaukee County |
| River Lake Subdivision | WI2460685 | CWS | Mequon | 100 | Ozaukee County |
| River Springs Apartments Llc | WI2520193 | CWS | Milwaukee | 38 | Racine County |
| River Trails Estates Water Users | WI2460680 | CWS | Mequon | 84 | Ozaukee County |
| River Valley Apts North | WI1281099 | CWS | Columbus | 48 | Jefferson County |
| River Valley Apts South | WI1281100 | CWS | Columbus | 48 | Jefferson County |
| River Villa Mobile Home Court | WI6170385 | CWS | Colfax | 60 | Dunn County |
| River Vista Estates Llc | WI1220121 | CWS | Potosi | 30 | Grant County |
| Riverside Elementary School | WI7370299 | NTNCWS | Weston | 590 | Marathon County |
| Riverside Energy Center | WI1541371 | NTNCWS | Beloit | 64 | Rock County |
| Riversite | WI2460770 | NTNCWS | Mequon | 250 | Ozaukee County |
| Riverview Estates Mhp | WI7500133 | CWS | Plover | 150 | Portage County |
| Riverview Park | WI6060227 | CWS | Colfax | 90 | Buffalo County |
| Riverview School | WI2300235 | NTNCWS | Silver Lake | 485 | Kenosha County |
| Robert William Park Water Association Inc | WI2410589 | CWS | Milwaukee | 1,065 | Milwaukee County |
| Roberts Waterworks | WI6560134 | CWS | Roberts | 1,872 | St. Croix County |
| Robinway Dairy Llc | WI4360013 | NTNCWS | Kiel | 28 | Manitowoc County |
| Rock County Christian School | WI1540205 | NTNCWS | Janesville | 105 | Rock County |
| Rock Prairie Dairy | WI1541560 | NTNCWS | Rising City | 50 | Rock County |
| Rock Prairie Montessori School | WI1541246 | NTNCWS | Janesville | 96 | Rock County |
| Rock River Leisure Estates Coop | WI1540167 | CWS | Edgerton | 650 | Rock County |
| Rock River Mobile Home Park | WI1280106 | CWS | Johnson Creek | 30 | Jefferson County |
| Rock Springs Waterworks | WI1570104 | CWS | Rock Springs | 292 | Sauk County |
| Rockfield School | WI2670332 | NTNCWS | Germantown | 375 | Washington County |
| Rockland Industrial Products | WI6420760 | NTNCWS | Rockland | 120 | Monroe County |
| Rockland Waterworks | WI6320333 | CWS | Rockland | 642 | La Crosse County, Monroe County |
| Rockvale Mhp | WI1540126 | CWS | Farmington Hills | 1,200 | Rock County |
| Rockwood Estates | WI7440144 | CWS | Minocqua | 48 | Oneida County |
| Rocky Knoll Health Care Fac | WI4600447 | CWS | Sheboygan | 564 | Sheboygan County |
| Rogers Mem Hosp - Cedar Ridge Main | WI2686713 | NTNCWS | Oconomowoc | 61 | Waukesha County |
| Rogers Mem Hosp - Hrc | WI2686124 | NTNCWS | Oconomowoc | 45 | Waukesha County |
| Rogers Mem Hosp - Kubly | WI2685711 | NTNCWS | Oconomowoc | 61 | Waukesha County |
| Rogers Mem Hosp - Ladish Co Foundation Center | WI2686937 | NTNCWS | Oconomowoc | 40 | Waukesha County |
| Rogers Mem Hosp - Main Hospital | WI2680294 | NTNCWS | Oconomowoc | 220 | Waukesha County |
| Rolling Hills Elementary Schl | WI2685657 | NTNCWS | Mukwonago | 666 | Waukesha County |
| Rolling Hills Mhp Llc | WI6560143 | CWS | Minneapolis | 90 | St. Croix County |
| Rolling Meadows Of Larsen Llc | WI4710458 | CWS | La Crosse | 85 | Winnebago County |
| Rome Water Utility | WI7010108 | CWS | Nekoosa | 2,775 | Adams County |
| Rose Glen Elementary | WI2680912 | NTNCWS | Waukesha | 652 | Waukesha County |
| Rosemore Village | WI4700125 | CWS | West Allis | 32 | Waushara County |
| Rosendale Dairy Llc North Parlor | WI4200768 | NTNCWS | Kaukauna | 50 | Fond du Lac County |
| Rosendale Dairy Llc South Parlor | WI4201425 | NTNCWS | Kaukauna | 75 | Fond du Lac County |
| Rosholt Elem School | WI7500704 | NTNCWS | Rosholt | 338 | Portage County |
| Rosholt High School | WI7500259 | NTNCWS | Rosholt | 214 | Portage County |
| Rothschild Waterworks | WI7370161 | CWS | Rothschild | 3,190 | Marathon County |
| Rudolph Elementary School | WI7720433 | NTNCWS | Wisconsin Rapids | 186 | Wood County |
| Rueden Ridge Subdivision | WI4451651 | CWS | Kaukauna | 100 | Outagamie County |
| Rustic Acres Mhp | WI4430494 | CWS | Costa Mesa | 90 | Oconto County |
| Ryan Incorporated Central | WI1541333 | NTNCWS | Janesville | 50 | Rock County |
| S & L Motors | WI4052387 | NTNCWS | Pulaski | 85 | Brown County |
| S & S Cycle Lower Well | WI1530179 | NTNCWS | Viola | 180 | Richland County |
| S & S Cycle Upper Well | WI1530178 | NTNCWS | Viola | 180 | Richland County |
| S And J Wild River Mhp | WI8580535 | CWS | Hayward | 90 | Sawyer County |
| S&S Jerseyland Dairy | WI4150417 | NTNCWS | Sturgeon Bay | 95 | Door County |
| Sacred Heart School | WI7500266 | NTNCWS | Custer | 150 | Portage County |
| Saddle Ridge Estates | WI1110123 | CWS | Portage | 700 | Columbia County |
| Sage Meadow Of Lake Geneva | WI2651013 | CWS | Chicago | 33 | Walworth County |
| Salem Grade School North Well | WI2300487 | NTNCWS | Salem | 800 | Kenosha County |
| Salem Grade School South Well | WI2300327 | NTNCWS | Salem | 300 | Kenosha County |
| Salem Lakes Business Park | WI2301975 | NTNCWS | Salem | 180 | Kenosha County |
| Sams Well Drilling | WI1141327 | NTNCWS | Randolph | 40 | Dodge County |
| Sanctuary Of Delafield | WI2685951 | CWS | Delafield | 27 | Waukesha County |
| Sand Hill | 055295705 | CWS | Oneida | 38 | |
| Sand Valley Golf Resort Employee Housing_Caddy Shack_Ops Tlr | WI7010635 | NTNCWS | Chicago | 70 | Adams County |
| Sand Valley Golf Resort- Clubhouse | WI7010382 | NTNCWS | Chicago | 25 | Adams County |
| Sand Valley Golf Resort- Maintenance Building | WI7010381 | NTNCWS | Chicago | 25 | Adams County |
| Saputo Cheese Usa Inc | WI6030399 | NTNCWS | Almena | 300 | Barron County |
| Saputo Cheese Usa Inc Waupun | WI4200507 | NTNCWS | Waupun | 435 | Fond du Lac County |
| Sargento Cheese Inc St Cloud | WI4201393 | NTNCWS | St Cloud | 385 | Fond du Lac County |
| Scharine Group Inc | WI1541575 | NTNCWS | Whitewater | 105 | Rock County |
| Schlitz Audubon Nature Center | WI3411152 | NTNCWS | Milwaukee | 399 | Milwaukee County |
| Schoenstatt Sisters Of Mary | WI2680242 | CWS | Waukesha | 80 | Waukesha County |
| Schuette Mfg & Steel Sales Inc | WI4361140 | NTNCWS | Manitowoc | 33 | Manitowoc County |
| Scott Water Utility Dist | WI4050071 | CWS | New Franken | 1,875 | Brown County |
| Scotts Industrial Coatings Llc | WI4052293 | NTNCWS | Green Bay | 40 | Brown County |
| Section Elementary School | WI2681105 | NTNCWS | Mukwonago | 540 | Waukesha County |
| Seek Inc | WI2461560 | NTNCWS | Grafton | 37 | Ozaukee County |
| Sendiks | WI2680504 | NTNCWS | Milwaukee | 310 | Waukesha County |
| Seneca Sanitary Dist No 1 | WI6120251 | CWS | Seneca | 250 | Crawford County |
| Sensient Flavors Llc | WI1141023 | NTNCWS | Juneau | 104 | Dodge County |
| Server Products | WI2670752 | NTNCWS | Richfield | 152 | Washington County |
| Sevastopol High Sch | WI4151163 | NTNCWS | Sturgeon Bay | 715 | Door County |
| Seven Mile Fair Expo Bldg | WI2520393 | NTNCWS | Caledonia | 999 | Racine County |
| Seven Mile Fair Market Square | WI2521921 | NTNCWS | Caledonia | 999 | Racine County |
| Sevenwinds Casino | 050595305 | NTNCWS | Hayward | 1,900 | |
| Sevenwinds Lodge And Convention Center | 050595307 | NTNCWS | Hayward | 782 | |
| Sextonville Waterworks | WI1530069 | CWS | Sextonville | 425 | Richland County |
| Shady Hill Mobile Home Park | WI1540115 | CWS | Stevens Point | 140 | Rock County |
| Shady Oaks Mhp | WI6170445 | CWS | Spring Valley | 40 | Dunn County |
| Sharon Waterworks | WI2650145 | CWS | Sharon | 1,549 | Walworth County |
| Sheboygan Co Airport | WI4600550 | NTNCWS | Sheboygan Falls | 65 | Sheboygan County |
| Sheboygan School District Admin Services | WI4600811 | NTNCWS | Sheboygan | 77 | Sheboygan County |
| Shelby Tn Of Sd 2 Arbor Hl | WI6320323 | CWS | La Crosse | 231 | La Crosse County |
| Shelby Tn Of Sd 2 Skyline | WI6320310 | CWS | La Crosse | 156 | La Crosse County |
| Shelby Tn Of Wedgewood Vly | WI6320311 | CWS | La Crosse | 1,020 | La Crosse County |
| Sheldon Water Utility | WI8550278 | CWS | Sheldon | 265 | Rusk County |
| Shell Lake Waterworks | WI8660304 | CWS | Shell Lake | 950 | Washburn County |
| Shelmet Precision Casting | WI4700400 | NTNCWS | Wild Rose | 45 | Waushara County |
| Shepherd Of The Hills Sch | WI4200343 | NTNCWS | Eden | 385 | Fond du Lac County |
| Sherwood Waterworks | WI4080271 | CWS | Sherwood | 3,114 | Calumet County |
| Shiloh Dairy Llc | WI4080146 | NTNCWS | Greenleaf | 42 | Calumet County |
| Shiloh Mennonite School | WI8550023 | NTNCWS | Conrath | 60 | Rusk County |
| Shining Stars Presch Child Care Ctr | WI4051412 | NTNCWS | Green Bay | 50 | Brown County |
| Shiocton Utilities | WI4450415 | CWS | Shiocton | 921 | Outagamie County |
| Shoreland Lutheran High School | WI2300340 | NTNCWS | Kenosha | 330 | Kenosha County |
| Shorewood Hills Waterworks | WI1130236 | CWS | Madison | 1,670 | Dane County |
| Shoto Corporation | WI4360554 | NTNCWS | Two Rivers | 40 | Manitowoc County |
| Siemers Holstein Farm Inc | WI4361139 | NTNCWS | Newton | 42 | Manitowoc County |
| Siga Funmaker Center | 050595019 | NTNCWS | Black River Falls | 35 | |
| Silver Lake Manor | WI4700250 | NTNCWS | Neshkoro | 67 | Waushara County |
| Silver Oak Apts | WI2300148 | CWS | Zion | 60 | Kenosha County |
| Silvercrest Apartments | WI2300498 | CWS | Oshkosh | 51 | Kenosha County, Winnebago County |
| Sinsinawa Dominicans Inc | WI1220118 | CWS | Sinsinawa | 213 | Grant County |
| Siren Waterworks | WI8070311 | CWS | Siren | 941 | Burnett County |
| Sister Bay Waterworks | WI4150510 | CWS | Sister Bay | 1,000 | Door County |
| Skygen Usa | WI2460969 | NTNCWS | Mequon | 64 | Ozaukee County |
| Small World Montessori School - Riverside | WI2520221 | NTNCWS | Racine | 70 | Racine County |
| Smart Sand Blair Llc | WI6270286 | NTNCWS | Tomah | 45 | Trempealeau County |
| Smart Sand Blair Llc Dry Plant | WI6620731 | NTNCWS | Tomah | 45 | Trempealeau County |
| Smart Sand Inc - Main Office | WI6420834 | NTNCWS | Yardley | 97 | Monroe County |
| Smart Sand Inc - Maintenance Shop | WI6420888 | NTNCWS | Yardley | 30 | Monroe County |
| Smart Sand Inc - West Office Well | WI6420780 | NTNCWS | Yardley | 25 | Monroe County |
| Smart Start Daycare Inc | WI4390036 | NTNCWS | Montello | 45 | Marquette County |
| Smith Farm Bldg | WI6560712 | NTNCWS | Eden Prairie | 25 | St. Croix County |
| Snider Mold Co | WI2460774 | NTNCWS | Mequon | 35 | Ozaukee County |
| Snug Harbor Inn Mhp | WI2650494 | CWS | Delavan | 30 | Walworth County |
| Soldiers Grove Waterworks | WI6120252 | CWS | Soldiers Grove | 592 | Crawford County |
| Solon Springs School | WI8160178 | NTNCWS | Solon Springs | 375 | Douglas County |
| Somers United Church Of Christ & Busy Bee Child Care Center | WI2301501 | NTNCWS | Kenosha | 260 | Kenosha County |
| Somerset Waterworks | WI6560137 | CWS | Somerset | 3,334 | St. Croix County |
| Source Energy Services | WI6620740 | NTNCWS | Blair | 75 | Trempealeau County |
| Source Energy Services Sumner West | WI6031122 | NTNCWS | Cameron | 100 | Barron County |
| South Wayne Waterworks | WI1330077 | CWS | South Wayne | 478 | Lafayette County |
| Southern Door Sch Dist | WI4151198 | NTNCWS | Brussels | 1,350 | Door County |
| Southern Wisconsin Center | WI2520199 | CWS | Union Grove | 950 | Racine County |
| Spacious Acres Mobile Home Community | WI1280114 | CWS | Menomonie Falls | 525 | Jefferson County |
| Specialty Granules Llc Kremlin Plant | WI4380755 | NTNCWS | Pembine | 120 | Marinette County |
| Spencer Waterworks | WI7370108 | CWS | Spencer | 1,848 | Marathon County |
| Spiros Industries | WI2671960 | NTNCWS | West Bend | 44 | Washington County |
| Spooner Waterworks | WI8660305 | CWS | Spooner | 2,653 | Washburn County |
| Spring Breeze Dairy | WI7340366 | NTNCWS | Appleton | 36 | Langlade County |
| Spring Green Estates | WI1570110 | CWS | Marshfield | 300 | Sauk County |
| Spring Green Estates North | WI1571284 | CWS | Marshfield | 32 | Sauk County |
| Spring Green Estates South | WI1571282 | CWS | Marshfield | 40 | Sauk County |
| Spring Green Waterworks | WI1570109 | CWS | Spring Green | 1,626 | Sauk County |
| Spring Valley Waterworks | WI6480249 | CWS | Spring Valley | 1,409 | Pierce County |
| Spuncast Inc - Well 1 | WI1140595 | NTNCWS | Watertown | 61 | Dodge County |
| Spuncast Inc - Well 2 | WI1141217 | NTNCWS | Watertown | 30 | Dodge County |
| Squires Grove | WI2680201 | CWS | Elm Grove | 410 | Waukesha County |
| Squires I | WI2681818 | NTNCWS | Brookfield | 172 | Waukesha County |
| St Adalbert School | WI7500267 | NTNCWS | Rosholt | 25 | Portage County |
| St Andrew Lutheran Church & Westside Christian School | WI1130737 | NTNCWS | Middleton | 850 | Dane County |
| St Anthony On The Lake School | WI2680593 | NTNCWS | Pewaukee | 276 | Waukesha County |
| St Augustine School | WI2670322 | NTNCWS | Waukesha | 81 | Washington County |
| St Benedicts Abbey | WI2300382 | NTNCWS | Benet Lake | 59 | Kenosha County |
| St Boniface Parochial School | WI6060237 | NTNCWS | Waumandee | 60 | Buffalo County |
| St Cloud Waterworks | WI4200477 | CWS | St Cloud | 471 | Fond du Lac County |
| St Croix Falls Waterworks | WI6490343 | CWS | St. Croix Falls | 2,079 | Polk County |
| St Croix Improvements | WI6480244 | CWS | Prescott | 175 | Pierce County |
| St Croix Therapy | WI6561079 | NTNCWS | Hudson | 45 | St. Croix County |
| St Francis Borgia Educational & Activity Center | WI2461691 | NTNCWS | Cedarburg | 420 | Ozaukee County |
| St Gabriel School-Parish | WI2671145 | NTNCWS | Hubertus | 438 | Washington County |
| St Germain El School | WI7641547 | NTNCWS | Eagle River | 161 | Vilas County |
| St Joan Of Arc School | WI2682168 | NTNCWS | Nashotah | 190 | Waukesha County |
| St John Lutheran Sch | WI4380028 | NTNCWS | Peshtigo | 81 | Marinette County |
| St John The Baptist Church & Providence Cath School | WI2301948 | NTNCWS | Kansasville | 75 | Kenosha County |
| St Johns Lutheran Sch | WI4360595 | NTNCWS | Manitowoc | 125 | Manitowoc County |
| St Johns Lutheran Sch | WI4430604 | NTNCWS | Suring | 60 | Oconto County |
| St Johns Lutheran Sch | WI4600547 | NTNCWS | Random Lake | 170 | Sheboygan County |
| St Johns Lutheran Sch | WI4700520 | NTNCWS | Fremont | 25 | Waushara County |
| St Johns Lutheran School | WI2670171 | NTNCWS | Newburg | 710 | Washington County |
| St Johns Northwestern Academies | WI2680761 | CWS | Delafield | 340 | Waukesha County |
| St Joseph Catholic School | WI1220181 | NTNCWS | Hazel Green | 100 | Grant County |
| St Joseph Church & School | WI2680729 | NTNCWS | Big Bend | 300 | Waukesha County |
| St Joseph San Dist 1 | WI6320318 | CWS | La Crosse | 503 | La Crosse County |
| St Marys Sch | WI4360598 | NTNCWS | Cato | 226 | Manitowoc County |
| St Marys School & St Marys Parish | WI2680511 | NTNCWS | Elm Grove | 606 | Waukesha County |
| St Nazianz Waterworks | WI4360433 | CWS | St Nazianz | 705 | Manitowoc County |
| St Paul Lutheran Ch Fremont | WI4690631 | NTNCWS | Fremont | 235 | Waupaca County |
| St Paul Lutheran Early Childhood Center & Church | WI4601834 | NTNCWS | Sheboygan Falls | 540 | Sheboygan County |
| St Paul Lutheran Sch & Ch | WI4310135 | NTNCWS | Luxemburg | 95 | Kewaunee County |
| St Pauls Evangelical Lutheran Church | WI4600592 | NTNCWS | Howards Grove | 735 | Sheboygan County |
| St Pauls Lutheran Ch & Sch | WI4200254 | NTNCWS | Mount Calvary | 92 | Fond du Lac County |
| St Pauls Lutheran School | WI1281013 | NTNCWS | Ixonia | 117 | Jefferson County |
| St Pauls School | WI2680311 | NTNCWS | Muskego | 269 | Waukesha County |
| St Peter Catholic Church & School | WI1130504 | NTNCWS | Middleton | 190 | Dane County |
| St Peters Lutheran School | WI1280216 | NTNCWS | Helenville | 87 | Jefferson County |
| St Peters Parochial Sch & Chrch | WI6090550 | NTNCWS | Chippewa Falls | 80 | Chippewa County |
| St-Genetics | WI4201507 | NTNCWS | Navasota | 80 | Fond du Lac County |
| St. Croix Clinic | 050595919 | NTNCWS | Webster | 109 | |
| St. John Lutheran School | WI7370189 | NTNCWS | Wausau | 151 | Marathon County |
| Stainless Specialist Inc | WI7371903 | NTNCWS | Wausau | 45 | Marathon County |
| Stanton Place I | WI1281122 | CWS | Ixonia | 66 | Jefferson County |
| Stanton Place Ii | WI1281162 | CWS | Ixonia | 32 | Jefferson County |
| Star Prairie Waterworks | WI6560141 | CWS | Star Prairie | 553 | St. Croix County |
| Stateline Mobile Home Park | WI1220100 | CWS | Hazel Green | 37 | Grant County |
| Statz Brothers Inc | WI1133898 | NTNCWS | Marshall | 60 | Dane County |
| Ste Well 1 | WI1541790 | NTNCWS | Beloit | 250 | Rock County |
| Stecker Machine Plant 1 | WI4360252 | NTNCWS | Manitowoc | 150 | Manitowoc County |
| Stecker Machine Plant 2 | WI4361287 | NTNCWS | Manitowoc | 80 | Manitowoc County |
| Stella-Jones - Office | WI6320103 | NTNCWS | Bangor | 60 | La Crosse County |
| Stella-Jones Wood Preserve Lunchroom | WI6320549 | NTNCWS | Bangor | 40 | La Crosse County |
| Stetsonville El School | WI8610217 | NTNCWS | Merrill | 300 | Taylor County |
| Stetsonville Waterworks | WI8610550 | CWS | Stetsonville | 563 | Taylor County |
| Stillson Elementary School | WI6091441 | NTNCWS | Chippewa Falls | 371 | Chippewa County |
| Stitzer Sanitary Dist 1 | WI1220047 | CWS | Stitzer | 150 | Grant County |
| Stock Manufacturing Corp | WI4360657 | NTNCWS | Newton | 37 | Manitowoc County |
| Stockbridge Waterworks | WI4080407 | CWS | Stockbridge | 680 | Calumet County |
| Stoddard Waterworks | WI6630262 | CWS | Stoddard | 793 | Vernon County |
| Stone Bank School | WI2685120 | NTNCWS | Oconomowoc | 470 | Waukesha County |
| Stone Lake Community | 055295201 | CWS | Crandon | 851 | Forest County |
| Stone Lake Sanitary District | WI8580502 | CWS | Stone Lake | 175 | Sawyer County, Washburn County |
| Stonecroft Condominium Assn | WI2460114 | CWS | Grafton | 50 | Ozaukee County |
| Stoney Creek Adult Community | WI2684360 | CWS | Muskego | 95 | Waukesha County |
| Stratford Waterworks | WI7370168 | CWS | Stratford | 1,643 | Marathon County |
| Stresau Lab | WI8660093 | NTNCWS | Spooner | 60 | Washburn County |
| String Swing Inc | WI6630652 | NTNCWS | Ontario | 49 | Monroe County |
| Strohwig Industries | WI2671172 | NTNCWS | Richfield | 166 | Washington County |
| Strum Waterworks | WI6620331 | CWS | Strum | 1,100 | Trempealeau County |
| Suburban Heights Mhp | WI1110103 | CWS | Pardeeville | 90 | Columbia County |
| Sugar Bush Elementary Sch | WI4450640 | NTNCWS | New London | 200 | Outagamie County |
| Sugar Camp Elementary School | WI7440658 | NTNCWS | Three Lakes | 150 | Oneida County |
| Sugar Maple Nature School | WI2461845 | NTNCWS | Port Washington | 155 | Ozaukee County |
| Sullivan Elementary School | WI1280309 | NTNCWS | Jefferson | 233 | Jefferson County |
| Sulzer Machine & Manufacturing Inc | WI7372642 | NTNCWS | Mosinee | 48 | Marathon County, Sauk County |
| Summer Oaks Condo Assoc | WI1570748 | CWS | Merrimac | 70 | Columbia County, Sauk County |
| Summit Elementary School | WI6320485 | NTNCWS | La Crosse | 302 | La Crosse County |
| Summit Learning Center | WI2301700 | NTNCWS | Twin Lakes | 50 | Kenosha County |
| Sunnyfield Acres | WI2680225 | CWS | Oconomowoc | 300 | Jefferson County, Waukesha County |
| Sunnyside Elementary Sch | WI4430818 | NTNCWS | Pulaski | 575 | Oconto County |
| Sunnyside Estates | WI1140854 | CWS | Baraboo | 135 | Dodge County |
| Sunset Ridge Elementary School | WI1132847 | NTNCWS | Middleton | 400 | Dane County |
| Super Sky Products Inc | WI2460451 | NTNCWS | Mequon | 78 | Ozaukee County |
| Superior Fresh Llc | WI6270606 | NTNCWS | Hixton | 100 | Jackson County |
| Suring Waterworks | WI4430498 | CWS | Suring | 517 | Oconto County |
| Sweet Additions Ingredient Processors Llc | WI6030630 | NTNCWS | Cameron | 42 | Barron County |
| Tainter Woods Condominiums | WI6170686 | CWS | Colfax | 85 | Dunn County |
| Tamarack Health Hayward Medical Center | WI8581004 | CWS | Hayward | 85 | Sawyer County |
| Tan Oak Apts | WI2301080 | CWS | Brookfield | 325 | Kenosha County |
| Taylor Waterworks | WI6270297 | CWS | Taylor | 498 | Jackson County |
| Team Winnebagoland | WI4711962 | NTNCWS | Oshkosh | 65 | Winnebago County |
| Techniplas Us Llc Plant 2 | WI2680861 | NTNCWS | Nashotah | 75 | Waukesha County |
| Techniplas Us Llc Warehouse | WI2681770 | NTNCWS | Nashotah | 75 | Waukesha County |
| Tecre Co Inc | WI4200872 | NTNCWS | Fond Du Lac | 60 | Fond du Lac County |
| Tennyson Waterworks | WI1220120 | CWS | Potosi | 367 | Grant County |
| Thedacare Medical Center Wild Rose | WI4700274 | NTNCWS | Wild Rose | 80 | Waushara County |
| Theresa Waterworks | WI1140154 | CWS | Theresa | 1,262 | Dodge County |
| Thiensville Professional Park | WI2460189 | NTNCWS | Thiensville | 90 | Ozaukee County |
| Thorp Equipment Inc | WI6100620 | NTNCWS | Thorp | 150 | Clark County |
| Thorp Mennonite Church & School | WI6100349 | NTNCWS | Thorp | 138 | Clark County |
| Thorp Waterworks | WI6100337 | CWS | Thorp | 1,636 | Clark County |
| Three Lakes Sanitary District | WI7440129 | CWS | Three Lakes | 500 | Oneida County |
| Tibbets Elementary School | WI2650211 | NTNCWS | Elkhorn | 248 | Walworth County |
| Tidy View Dairy Llc | WI4451736 | NTNCWS | Kaukauna | 111 | Outagamie County |
| Tigerton Waterworks | WI4590462 | CWS | Tigerton | 705 | Shawano County |
| Tjj Of Maine Llc | WI7372616 | NTNCWS | Wausau | 56 | Marathon County |
| Tlc Learning Center | WI1110777 | NTNCWS | Lodi | 50 | Columbia County |
| Tomahawk Live Trap Llc | WI7441053 | NTNCWS | Hazelhurst | 52 | Oneida County |
| Tomorrows Children Educational Facility | WI4690273 | NTNCWS | Waupaca | 35 | Waupaca County |
| Toms Quality Millwork And Hardwoods Inc | WI4201440 | NTNCWS | Campbellsport | 102 | Fond du Lac County |
| Tonawanda Elementary School | WI2681156 | NTNCWS | Elm Grove | 628 | Waukesha County |
| Tony Waterworks | WI8550459 | CWS | Tony | 105 | Rusk County |
| Topcon Positioning Systems | WI1280577 | NTNCWS | Ft Atkinson | 105 | Jefferson County |
| Tower Pallet | WI4051564 | NTNCWS | De Pere | 37 | Brown County |
| Tower Rock Elementary School | WI1570363 | NTNCWS | Prairie Du Sac | 180 | Sauk County |
| Town Hall Apts | WI2651216 | CWS | Elkhorn | 90 | Walworth County |
| Town Of Farmington Sanitary District | WI6320326 | CWS | Mindoro | 275 | La Crosse County |
| Tpc Wisconsin Clubhouse | WI1130582 | NTNCWS | Madison | 130 | Dane County |
| Trailer Court | 055295504 | CWS | Keshena | 68 | Menominee County |
| Travel Centers Of America | WI6560266 | NTNCWS | Las Vegas | 125 | St. Croix County |
| Traver School | WI2650248 | NTNCWS | Lake Geneva | 136 | Walworth County |
| Treehouse Academy | WI1541201 | NTNCWS | Edgerton | 74 | Rock County |
| Tremain Mobile Home Park | WI1280127 | CWS | Stevens Point | 475 | Jefferson County |
| Trempealeau Waterworks | WI6620332 | CWS | Trempealeau | 1,888 | Trempealeau County |
| Trevor Center | WI2301156 | NTNCWS | Grayslake | 90 | Kenosha County |
| Trevor Wilmot Consolidated School | WI2300223 | NTNCWS | Trevor | 394 | Kenosha County |
| Trevor Wilmot Consolidated School Addition | WI2302047 | NTNCWS | Trevor | 394 | Kenosha County |
| Trienda Holdings Llc | WI1110447 | NTNCWS | Portage | 240 | Columbia County |
| Trillium Hill Farm | WI4240206 | NTNCWS | Berlin | 49 | Green Lake County |
| Trinity Ev Lutheran Church & School | WI7720427 | NTNCWS | Marshfield | 430 | Wood County |
| Trinity Ev Lutheran School & Church - Freistadt | WI2460310 | NTNCWS | Mequon | 250 | Ozaukee County |
| Trinity Evangelical Luth Ch & Sch | WI2670312 | NTNCWS | West Bend | 215 | Washington County |
| Trinity Family Center | WI6560029 | NTNCWS | Hudson | 136 | St. Croix County |
| Trinity Lutheran Church & School | WI2520415 | NTNCWS | Caledonia | 398 | Racine County |
| Trinity Lutheran Church And Day School | WI7441145 | NTNCWS | Minocqua | 91 | Oneida County |
| Trinity Lutheran Parsonage & Old School | WI2520416 | NTNCWS | Caledonia | 159 | Racine County |
| Trinity Lutheran Sch & Ch | WI4080314 | NTNCWS | Hilbert | 84 | Calumet County |
| Trinity Lutheran School | WI4200242 | NTNCWS | Campbellsport | 45 | Fond du Lac County |
| Troy Center Sanitary District | WI2650146 | CWS | Troy Center | 170 | Walworth County |
| Troy Terrace Mhp | WI2650124 | CWS | Diamondhead | 150 | Walworth County |
| Trussworks Inc | WI8581181 | NTNCWS | Hayward | 50 | Sawyer County |
| Turtle Lake Waterworks | WI6030142 | CWS | Turtle Lake | 1,073 | Barron County, Polk County |
| Twin Lakes Complex | WI2300619 | CWS | Twin Lakes | 50 | Kenosha County |
| Twin Lakes Park Water Coop | WI2300151 | CWS | Twin Lakes | 150 | Kenosha County |
| U S F S Forestry Sciences Laboratory | WI7440204 | NTNCWS | Rhinelander | 65 | Oneida County |
| Union Center Waterworks | WI7290136 | CWS | Union Center | 225 | Juneau County |
| United Parcel Service | WI2681237 | NTNCWS | Elm Grove | 250 | Waukesha County |
| United Pride Dairy Llc | WI8510055 | NTNCWS | Phillips | 49 | Price County |
| United Wi Grain Producers | WI1110300 | NTNCWS | Friesland | 45 | Columbia County |
| University Lake Brumder Gym & Middle School | WI2682299 | NTNCWS | Hartland | 180 | Waukesha County |
| University Lake Lower School | WI2685764 | NTNCWS | Hartland | 325 | Waukesha County |
| University Lake School Pavilion | WI2682445 | NTNCWS | Hartland | 100 | Waukesha County |
| University Lake Upper School & Fine Arts Building | WI2680672 | NTNCWS | Hartland | 145 | Waukesha County |
| University Ridge Clubhouse | WI1132175 | NTNCWS | Madison | 290 | Dane County |
| Upi Manufacturing | WI2686588 | NTNCWS | Eagle | 107 | Waukesha County |
| Upper Midwest Environmental Sciences Ctr | WI6321101 | NTNCWS | La Crosse | 70 | La Crosse County |
| Us Coast Guard Station | WI4151188 | NTNCWS | Cleveland | 35 | Door County |
| Us Dairy Forage Research Center | WI1570648 | NTNCWS | Madison | 40 | Sauk County |
| Usp Hartford Llc D/B/A Pallet Usa | WI2671311 | NTNCWS | Hartford | 77 | Washington County |
| Uw Agricultural Research Station Hdqtrs | WI1110249 | NTNCWS | Madison | 180 | Columbia County |
| Uw Physical Sciences Lab | WI1131278 | NTNCWS | Madison | 50 | Dane County |
| V & V Supremo - Chula Vista Cheese | WI1330320 | NTNCWS | Chicago | 130 | Lafayette County |
| Valders Waterworks | WI4360437 | CWS | Valders | 954 | Manitowoc County |
| Van Horn Llc Corporate Office | WI4602193 | NTNCWS | Plymouth | 50 | Sheboygan County |
| Van Horn Nissan - Volkswagen - Hyundai | WI4601899 | NTNCWS | Plymouth | 59 | Sheboygan County |
| Van-Gogh Homes Llc | WI1230076 | CWS | Monroe | 46 | Green County |
| Veritas Steel 1 | WI7370425 | NTNCWS | Wausau | 89 | Marathon County |
| Veritas Steel 2 | WI7371300 | NTNCWS | Wausau | 89 | Marathon County |
| Vernon Child Development Center Foundation | WI2680924 | NTNCWS | Big Bend | 364 | Waukesha County |
| Vesper Waterworks | WI7720134 | CWS | Vesper | 512 | Wood County |
| Victory Ch | WI4690298 | NTNCWS | Waupaca | 585 | Waupaca County |
| Villa Diann Mhp | WI6180290 | CWS | Altoona | 420 | Eau Claire County |
| Village Acres Mobile Home Ct Llc | WI6100340 | CWS | Eau Claire | 32 | Clark County |
| Village Court Llc | WI2683040 | NTNCWS | St Clair Shores | 400 | Waukesha County |
| Village Glen Apts | WI2460140 | CWS | Mequon | 30 | Ozaukee County |
| Village Heights | WI2460145 | CWS | Thiensville | 130 | Ozaukee County |
| Village Plaza Apts | WI2301035 | CWS | Paddock Lake | 28 | Kenosha County |
| Vintage Estates | WI2460705 | CWS | Mequon | 130 | Ozaukee County |
| Vintage On The Ponds | WI2651311 | CWS | Delavan | 60 | Walworth County |
| Viola Waterworks | WI6630269 | CWS | Viola | 667 | Richland County, Vernon County |
| Vpp Group Llc | WI6420458 | NTNCWS | Norwalk | 150 | Monroe County |
| W P S C Fox Energy Ctr | WI4451671 | NTNCWS | Kaukauna | 30 | Outagamie County |
| W R R Environmental Services Co Inc | WI6180353 | NTNCWS | Eau Claire | 95 | Eau Claire County |
| Wabash National Trailer Centers Inc | WI7290186 | NTNCWS | Mauston | 48 | Juneau County |
| Wabeno Sanitary Dist 1 | WI7210110 | CWS | Wabeno | 750 | Forest County |
| Waldo Waterworks | WI4600456 | CWS | Waldo | 500 | Sheboygan County |
| Wales Pick N Save | WI2685709 | NTNCWS | Milwaukee | 1,900 | Waukesha County |
| Wall Street Village | WI6560886 | CWS | Colfax | 191 | St. Croix County |
| Walsdorf Roofing Co | WI4080360 | NTNCWS | Kiel | 30 | Calumet County |
| Walters Brothers Lumber Mfg | WI6090746 | NTNCWS | Radisson | 25 | Chippewa County |
| Walworth Waterworks | WI2650149 | CWS | Walworth | 2,304 | Walworth County |
| Warrens Waterworks | WI6420305 | CWS | Warrens | 540 | Monroe County |
| Washburn Waterworks | WI8040132 | CWS | Washburn | 2,280 | Bayfield County |
| Washington Island Sch | WI4151166 | NTNCWS | Washington Island | 80 | Door County |
| Washington School | WI2520386 | NTNCWS | Waterford | 266 | Racine County |
| Waters Edge Condominium Association | WI2460823 | CWS | Thiensville | 50 | Ozaukee County |
| Waukesha Christian Academy | WI2680619 | NTNCWS | Waukesha | 60 | Waukesha County |
| Waupaca High Sch | WI4691031 | NTNCWS | Waupaca | 400 | Waupaca County |
| Waupun Equipment Co Inc | WI1140280 | NTNCWS | Waupun | 75 | Dodge County |
| Waupun State Farm | WI1140123 | NTNCWS | Madison | 53 | Dodge County |
| Wausaukee Waterworks | WI4380445 | CWS | Wausaukee | 585 | Marinette County |
| Wautoma Water Dept | WI4700718 | CWS | Wautoma | 2,280 | Waushara County |
| Wauzeka Waterworks | WI6120253 | CWS | Wauzeka | 711 | Crawford County |
| Wayside Nursery | WI2461581 | NTNCWS | Mequon | 45 | Ozaukee County |
| We Energies Delafield Service Center | WI2681834 | NTNCWS | Milwaukee | 100 | Waukesha County |
| Weasler Engineering | WI2670196 | NTNCWS | West Bend | 325 | Washington County |
| Webster Waterworks | WI8070312 | CWS | Webster | 652 | Burnett County |
| Wells Concrete Prod Co | WI4360389 | NTNCWS | Valders | 95 | Manitowoc County |
| Wells St Station 425 West | WI2686466 | CWS | Delafield | 25 | Waukesha County |
| Wells St Station 435 East | WI2686619 | CWS | Delafield | 25 | Waukesha County |
| West Baraboo Waterworks | WI1570112 | CWS | Baraboo | 1,414 | Sauk County |
| West Gate Estates Mobile Hms | WI7370152 | CWS | Stevens Point | 43 | Marathon County |
| West Middleton Elementary School | WI1130529 | NTNCWS | Middleton | 360 | Dane County |
| West Riverside Energy Center | WI1541739 | NTNCWS | Beloit | 67 | Rock County |
| West Towne Office Center | WI1131359 | NTNCWS | Madison | 60 | Dane County |
| Westboro San Dist 1 | WI8610346 | CWS | Westboro | 150 | Taylor County |
| Westby Waterworks | WI6630267 | CWS | Westby | 2,400 | Vernon County |
| Westchester Lakes Subdivision | WI2460794 | CWS | Mequon | 300 | Ozaukee County |
| Western Racquet Club | WI2682958 | NTNCWS | Elm Grove | 160 | Waukesha County |
| Western Technical College-Sparta | WI6420219 | NTNCWS | La Crosse | 135 | Monroe County |
| Western Village | WI2520406 | NTNCWS | Oak Brook | 400 | Racine County |
| Westfield Elementary Sch | WI4390309 | NTNCWS | Westfield | 350 | Marquette County |
| Weston Elementary & Middle School | WI1570842 | NTNCWS | Cazenovia | 196 | Sauk County |
| Weston High School | WI1570357 | NTNCWS | Cazenovia | 162 | Sauk County |
| Westport Bishops Bay Area | WI1134103 | CWS | Waunakee | 80 | Dane County |
| Westport Water Utility | WI1132442 | CWS | Waunakee | 800 | Dane County |
| Westshire Farms At The Lakes | WI2651598 | CWS | Middleton | 300 | Walworth County |
| Westwind Estates | WI7010072 | CWS | Friendship | 160 | Adams County |
| Weyauwega Waterworks | WI4690403 | CWS | Weyauwega | 1,820 | Waupaca County |
| Weyerhaeuser Waterworks | WI8550132 | CWS | Weyerhaeuser | 238 | Rusk County |
| Wheatland Center School | WI2300988 | NTNCWS | Burlington | 475 | Kenosha County |
| Wheatland Center School Addition - Middle School | WI2301872 | NTNCWS | Burlington | 325 | Kenosha County |
| Wheatland Estates | WI2300156 | CWS | Farmington Hills | 450 | Kenosha County |
| Wheeler Waterworks Assoc | WI6170274 | CWS | Wheeler | 317 | Dunn County |
| Whispering Pines Apts | WI2300786 | CWS | Hawthorn Woods | 30 | Kenosha County |
| Whispering Pines Mhp | WI6470140 | CWS | Colfax | 60 | Pepin County |
| White Lake Waterworks | WI7340118 | CWS | White Lake | 256 | Langlade County, Oconto County |
| Whitehall Waterworks | WI6620275 | CWS | Whitehall | 1,820 | Trempealeau County |
| Whitelaw Waterworks | WI4360439 | CWS | Whitelaw | 757 | Manitowoc County |
| Whitetail Crossing Casino | 050595018 | NTNCWS | Black River Falls | 1,069 | |
| Whiting Waterworks | WI7500136 | CWS | Stevens Point | 1,743 | Portage County |
| Whitnall Garden Apartments | WI2410918 | CWS | Hales Corners | 200 | Milwaukee County |
| Wi Air National Guard Volk Field | WI7290120 | CWS | Camp Douglas | 400 | Juneau County |
| Wi Dnr Horicon Service Center | WI1140229 | NTNCWS | Horicon | 100 | Dodge County |
| Wi Heights High School | WI1130566 | NTNCWS | Mazomanie | 780 | Dane County |
| Wiese Brothers Farm New Dairy | WI4052632 | NTNCWS | Greenleaf | 45 | Brown County |
| Wiese Brothers Farm Old Dairy | WI4052633 | NTNCWS | Greenleaf | 45 | Brown County |
| Wieser Concrete Products Inc | WI6480391 | NTNCWS | Maiden Rock | 45 | Pierce County |
| Wild Rose Elementary Sch | WI4700769 | NTNCWS | Wild Rose | 250 | Waushara County |
| Wild Rose Middle High Sch | WI4700518 | NTNCWS | Wild Rose | 350 | Waushara County |
| Wildlands School Beaver Creek Reserve | WI6180330 | NTNCWS | Fall Creek | 25 | Eau Claire County |
| Williams Bay Waterworks | WI2650060 | CWS | Williams Bay | 2,601 | Walworth County |
| Williamsburg 206 | WI2460148 | CWS | Milwaukee | 48 | Ozaukee County |
| Williamsburg 207 209 And 214 | WI2460147 | CWS | Milwaukee | 70 | Milwaukee County, Ozaukee County |
| Williamsburg 220 | WI2460067 | CWS | Milwaukee | 32 | Ozaukee County |
| Willow Glen Apartments | WI2683555 | CWS | Mequon | 80 | Waukesha County |
| Willow Lane Estates | WI8550135 | CWS | Stevens Point | 34 | Rusk County |
| Willow Pines Mfd Home Community | WI4710459 | CWS | Colgate | 70 | Winnebago County |
| Willow Springs Mhp 2 & 3 | WI2680232 | CWS | Barrington | 446 | Waukesha County |
| Willows Christian Child Care Center | WI3140010 | NTNCWS | Iron Ridge | 103 | Dodge County |
| Wilmot Union High School | WI2300490 | NTNCWS | Wilmot | 1,200 | Kenosha County |
| Wilson Waterworks | WI6560259 | CWS | Wilson | 170 | St. Croix County |
| Wilton Waterworks | WI6420306 | CWS | Wilton | 490 | Monroe County |
| Winchester School | WI4710611 | NTNCWS | Larsen | 35 | Winnebago County |
| Wind Point Water Dept | WI2520191 | CWS | Racine | 1,804 | Racine County |
| Windsor Water Utility North | WI1130246 | CWS | Windsor | 400 | Dane County |
| Windsor Water Utility South | WI1130267 | CWS | Windsor | 4,607 | Dane County |
| Winkler School | WI2522353 | NTNCWS | Burlington | 124 | Racine County |
| Winnebago Area Sanitary District | WI4712094 | CWS | Oshkosh | 90 | Winnebago County |
| Winneconne Waterworks | WI4710354 | CWS | Winneconne | 2,502 | Winnebago County |
| Winter Waterworks | WI8580534 | CWS | Winter | 344 | Sawyer County |
| Wiota Sanitary District | WI1330078 | CWS | South Wayne | 98 | Lafayette County |
| Wisconsin Academy Main Campus | WI1110248 | CWS | Fall River | 115 | Columbia County |
| Wisconsin Central Railway | WI4200247 | NTNCWS | North Fond Du Lac | 50 | Fond du Lac County |
| Wisconsin Dells Waterworks | WI1110113 | CWS | Wisconsin Dells | 3,232 | Columbia County, Sauk County |
| Wisconsin Veterans Home | WI4690395 | CWS | King | 950 | Waupaca County |
| Wiskerchen Cheese Llc | WI7720127 | NTNCWS | Auburndale | 100 | Wood County |
| Withee Waterworks | WI6100283 | CWS | Withee | 506 | Clark County |
| Witt Family Ford | WI4590318 | NTNCWS | Pulaski | 59 | Shawano County |
| Wittenberg Waterworks | WI4590465 | CWS | Wittenberg | 1,200 | Shawano County |
| Wolf River Luth Hs | WI4590336 | NTNCWS | Shawano | 45 | Shawano County |
| Wolfs Mobile Homes | WI1280126 | CWS | Whitewater | 40 | Jefferson County |
| Woller Precision Machine Llc | WI4380360 | NTNCWS | Pound | 41 | Marinette County |
| Wonewoc Waterworks | WI7290137 | CWS | Wonewoc | 758 | Juneau County |
| Wood School Dist 4 | WI2650252 | NTNCWS | N2575 Snake Rd | 130 | Walworth County |
| Wood Violet Recovery | WI1250370 | NTNCWS | Dodgeville | 200 | Iowa County |
| Woodbridge Estates | WI1133471 | CWS | Madison | 48 | Dane County |
| Woodland Estates Mhc 1 | WI2300174 | CWS | Chicago | 50 | Kenosha County |
| Woodland Estates Mhc 2 | WI2300175 | CWS | Chicago | 50 | Kenosha County |
| Woodland Park | WI4200798 | CWS | Miami | 66 | Fond du Lac County |
| Woodridge Estates | WI2460824 | CWS | Mequon | 100 | Ozaukee County |
| Woodville Waterworks | WI6560138 | CWS | Woodville | 1,386 | St. Croix County |
| Wrightstown Waterworks | WI4050464 | CWS | Wrightstown | 3,815 | Brown County, Outagamie County |
| Wsi 772 Specialists Ave | WI4711328 | NTNCWS | Neenah | 40 | Winnebago County |
| Wsi 8500 Martin Dr | WI4711240 | NTNCWS | Neenah | 40 | Winnebago County |
| Wsi 8520 & 8525 Martin Dr | WI4711430 | NTNCWS | Neenah | 60 | Winnebago County |
| Wst Fab Llc | WI4361474 | NTNCWS | Manitowoc | 70 | Manitowoc County |
| Wyeville Elementary School | WI6420311 | NTNCWS | Tomah | 130 | Monroe County |
| Wyngate Subdivision | WI2460781 | CWS | Mequon | 100 | Ozaukee County |
| Wyocena Waterworks | WI1110124 | CWS | Wyocena | 768 | Columbia County |
| Wywood Community Inc | WI2300152 | CWS | Twin Lakes | 59 | Kenosha County |
| Xcel Energy | WI8020422 | NTNCWS | Ashland | 34 | Ashland County |
| Xcel Energy French Island Rdf Plant | WI6320556 | NTNCWS | La Crosse | 35 | La Crosse County |
| Xpo Logistics | WI2410717 | NTNCWS | Ann Arbor | 232 | Milwaukee County |
| Yahara Valley Elementary School | WI1540306 | NTNCWS | Edgerton | 140 | Rock County |
| Yellow Rock Real Estate | WI2460881 | NTNCWS | Mequon | 135 | Ozaukee County |
| Yorkville School | WI2520361 | NTNCWS | Union Grove | 561 | Racine County |
| Yuba Waterworks | WI1530071 | CWS | Yuba | 68 | Richland County |
| Zahn Farms | WI4430291 | NTNCWS | Gillett | 74 | Oconto County |
| Zion Lutheran Sch Morrison | WI4050486 | NTNCWS | Greenleaf | 115 | Brown County |
| Zion Lutheran Sch Wayside | WI4050487 | NTNCWS | Greenleaf | 150 | Brown County |
| Zoar | 055295509 | CWS | Keshena | 100 | |
| Zweifels Country View | WI1250272 | CWS | Dodgeville | 40 | Iowa County |