1,695 community and non-transient non-community water systems are listed for Ohio in EPA SDWIS. 347 were sampled under UCMR 5; 142 of those had at least one PFAS result at or above the reporting level, and 60 had a highest single result at or above a 2024 EPA limit (PFOA or PFOS 4 ppt, or Hazard Index 1).
Ohio 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 (347)
| System | PWSID | City | Population | Highest PFOA (ppt) | Highest PFOS (ppt) | Highest HI | Highest single result |
|---|---|---|---|---|---|---|---|
| Ada Village | OH3300012 | Ada | 5,334 | <MRL | <MRL | 0 | No PFAS detected |
| Adams County Regional Water District | OH0100012 | West Union | 21,810 | <MRL | <MRL | 0 | No PFAS detected |
| Akron City Pws | OH7700011 | Kent | 280,000 | 7.3 | <MRL | 0 | PFOA 1–3 × its limit |
| Alliance City Pws | OH7600011 | Alliance | 22,232 | <MRL | <MRL | 0 | Other PFAS detected |
| Amherst City Pws | OH4700003 | Amherst | 11,797 | <MRL | <MRL | 0 | No PFAS detected |
| Andover-Camplands Water | OH0400212 | Andover | 6,009 | <MRL | <MRL | 0 | No PFAS detected |
| Aqua Ohio - Ashtabula | OH0400711 | Ashtabula | 32,342 | <MRL | <MRL | 0 | No PFAS detected |
| Aqua Ohio - Aurora E | OH6700512 | Massillon | 766 | <MRL | <MRL | 0 | No PFAS detected |
| Aqua Ohio - Blacklick | OH2502412 | Westerville | 7,100 | <MRL | <MRL | 0 | No PFAS detected |
| Aqua Ohio - Huber Ridge Pws | OH2502512 | Westerville | 5,393 | <MRL | <MRL | 0 | No PFAS detected |
| Aqua Ohio - Lake Darby | OH2502612 | Westerville | 3,562 | <MRL | <MRL | 0 | No PFAS detected |
| Aqua Ohio - Lawrence County | OH4400803 | Westerville | 8,130 | 4.2 | <MRL | 0 | PFOA 1–3 × its limit |
| Aqua Ohio - Marion | OH5100414 | Marion | 47,102 | <MRL | <MRL | 0 | No PFAS detected |
| Aqua Ohio - Massillon Pws | OH7604512 | Massillon | 95,636 | <MRL | <MRL | 0 | Other PFAS detected |
| Aqua Ohio - Masury | OH7802711 | Struthers | 4,019 | <MRL | <MRL | 0 | Other PFAS detected |
| Aqua Ohio - Mentor | OH4301511 | Mentor | 74,500 | <MRL | <MRL | 0 | No PFAS detected |
| Aqua Ohio - Preble County | OH6835203 | Westerville | 1,748 | <MRL | <MRL | 0 | No PFAS detected |
| Aqua Ohio - Struthers | OH5001611 | Struthers | 58,551 | <MRL | <MRL | 0 | Other PFAS detected |
| Aqua Ohio - Tiffin | OH7400614 | Marion | 20,279 | <MRL | <MRL | 0 | No PFAS detected |
| Aqua Ohio - Village Of Jefferson | OH0401812 | Ashtabula | 3,226 | <MRL | <MRL | 0 | No PFAS detected |
| Archbold Village | OH2600011 | Archbold | 5,586 | <MRL | <MRL | 0 | No PFAS detected |
| Ashland City | OH0300112 | Ashland | 20,648 | <MRL | <MRL | 0 | No PFAS detected |
| Ashtabula County Water System | OH0400803 | Jefferson | 14,757 | <MRL | <MRL | 0 | No PFAS detected |
| Ashville Village Pws | OH6500012 | Ashville | 4,529 | <MRL | <MRL | 0 | No PFAS detected |
| Athens Pws | OH0500212 | Athens | 32,725 | <MRL | <MRL | 0 | No PFAS detected |
| Aurora City - Cleveland Pws | OH6789112 | Aurora | 15,852 | <MRL | <MRL | 0 | No PFAS detected |
| Avon City Pws | OH4700203 | Avon | 24,060 | <MRL | <MRL | 0 | No PFAS detected |
| Avon Lake City Pws | OH4700311 | Avon Lake | 23,659 | <MRL | <MRL | 0 | No PFAS detected |
| Barberton City | OH7700411 | Norton | 31,298 | <MRL | <MRL | 0 | No PFAS detected |
| Barnesville | OH0700011 | Barnesville | 6,500 | 8.1 | <MRL | 0 | PFOA 1–3 × its limit |
| Bedford City Pws | OH1800003 | Bedford | 13,149 | <MRL | <MRL | 0 | No PFAS detected |
| Bellaire Public Water System | OH0700114 | Bellaire | 4,278 | <MRL | <MRL | 0.002 | Hazard Index below its limit |
| Bellbrook Water Works | OH2901112 | Bellbrook | 9,475 | <MRL | 5.7 | 0.333 | PFOS 1–3 × its limit |
| Bellefontaine City Pws | OH4600112 | Bellefontaine | 13,249 | <MRL | <MRL | 0.002 | Hazard Index below its limit |
| Bellevue City | OH3900011 | Bellevue | 8,236 | <MRL | <MRL | 0 | Other PFAS detected |
| Belmont Co. Sanitary District 3 Pws | OH0700412 | Barnesville | 26,822 | <MRL | <MRL | 0 | No PFAS detected |
| Belpre City Pws | OH8400012 | Belpre | 6,441 | <MRL | <MRL | 0 | Other PFAS detected |
| Berea City Pws | OH1800111 | Berea | 18,789 | <MRL | <MRL | 0 | No PFAS detected |
| Bethel Village Pws | OH1300116 | Bethel | 2,620 | 7.9 | <MRL | 0 | PFOA 1–3 × its limit |
| Bexley City Pws | OH2500103 | Bexley | 14,250 | 5.6 | <MRL | 0.004 | PFOA 1–3 × its limit |
| Blanchester Village Pws | OH1400111 | Fayetteville | 4,243 | <MRL | <MRL | 0 | Other PFAS detected |
| Bluffton Village | OH0200112 | Bluffton | 4,082 | <MRL | <MRL | 0.004 | Hazard Index below its limit |
| Bowling Green City | OH8700311 | Bowling Green | 31,578 | <MRL | <MRL | 0.002 | Hazard Index below its limit |
| Bradford Village Pws | OH1900212 | Bradford | 2,000 | <MRL | <MRL | 0 | No PFAS detected |
| Brookville Municipality Pws | OH5700203 | Brookville | 5,923 | <MRL | <MRL | 0.002 | Hazard Index below its limit |
| Brown County Rural Water | OH0802012 | Ripley | 32,090 | <MRL | <MRL | 0 | No PFAS detected |
| Bryan City Pws | OH8600012 | Bryan | 8,729 | <MRL | <MRL | 0 | No PFAS detected |
| Buckeye Water District - Ohio River | OH1502911 | Wellsville | 10,300 | <MRL | <MRL | 0 | No PFAS detected |
| Bucyrus City | OH1700011 | Bucyrus | 12,570 | <MRL | <MRL | 0 | No PFAS detected |
| Butler Co. Water District 2 Pws | OH0900303 | Hamilton | 116,572 | <MRL | <MRL | 0.472 | Hazard Index below its limit |
| Byesville | OH3001212 | Byesville | 5,104 | <MRL | <MRL | 0 | No PFAS detected |
| Cadiz Village Pws | OH3400214 | Cadiz | 3,353 | <MRL | <MRL | 0 | No PFAS detected |
| Caldwell Village Pws | OH6100011 | Caldwell | 3,300 | 13 | <MRL | 0 | PFOA ≥ 3 × its limit |
| Cambridge, City Of | OH3000111 | Cambridge | 10,520 | 5.6 | <MRL | 0 | PFOA 1–3 × its limit |
| Canal Fulton City Pws | OH7600912 | Canal Fulton | 5,323 | <MRL | <MRL | 0 | No PFAS detected |
| Canal Winchester City Pws | OH2500312 | Canal Winchester | 9,286 | <MRL | <MRL | 0 | No PFAS detected |
| Canfield City Pws | OH5000503 | Canfield | 7,706 | 4.2 | 12.4 | 0.53 | PFOS ≥ 3 × its limit |
| Canton Public Water System | OH7608112 | Canton | 107,113 | <MRL | <MRL | 0 | No PFAS detected |
| Carey Village Pws | OH8800012 | Carey | 3,674 | <MRL | <MRL | 0 | No PFAS detected |
| Cedarville University | OH2903612 | Cedarville | 4,000 | <MRL | <MRL | 0 | No PFAS detected |
| Celina, City Of | OH5400011 | Celina | 11,682 | <MRL | <MRL | 0 | Other PFAS detected |
| Chagrin Falls Village Pws | OH1800212 | Chagrin Falls | 4,991 | <MRL | <MRL | 0 | No PFAS detected |
| Chardon City Pws | OH2800412 | Chardon | 5,247 | <MRL | <MRL | 0 | No PFAS detected |
| Chillicothe City Pws | OH7100112 | Chillicothe | 21,725 | <MRL | <MRL | 0.002 | Hazard Index below its limit |
| Chillicothe Correctional Institution | OH7101212 | Oak Hill | 9,000 | <MRL | <MRL | 0 | No PFAS detected |
| Cincinnati Childrens Hosp Ionization Sys | OH3139912 | Cincinnati | 1,514 | <MRL | <MRL | 0.63 | Hazard Index below its limit |
| Cincinnati Public Water System | OH3102612 | Cincinnati | 800,000 | <MRL | 6.1 | 0.002 | PFOS 1–3 × its limit |
| Circleville City Pws | OH6500412 | Circleville | 13,927 | <MRL | <MRL | 0 | No PFAS detected |
| City Of Heath Pws | OH4500912 | Heath | 10,310 | <MRL | <MRL | 0 | No PFAS detected |
| Clark County Green Meadows 2 Pws | OH1200703 | Springfield | 3,008 | <MRL | <MRL | 0 | No PFAS detected |
| Clark County Northridge Pws | OH1201003 | Springfield | 8,874 | <MRL | <MRL | 0 | No PFAS detected |
| Clark County Park Layne Pws | OH1201112 | Springfield | 4,221 | <MRL | <MRL | 0 | No PFAS detected |
| Clermont Public Water System | OH1302212 | Batavia | 133,059 | <MRL | 10.1 | 0.002 | PFOS 1–3 × its limit |
| Cleveland Public Water System | OH1801212 | Cleveland | 1,308,955 | <MRL | <MRL | 0 | No PFAS detected |
| Cleves Village Pws | OH3100512 | Cleves | 6,000 | <MRL | <MRL | 0 | No PFAS detected |
| Clyde City | OH7200211 | Clyde | 6,325 | <MRL | <MRL | 0 | Other PFAS detected |
| Coldwater Village | OH5400112 | Coldwater | 4,774 | <MRL | <MRL | 0 | No PFAS detected |
| Columbiana City Pws | OH1500312 | Columbiana | 6,727 | <MRL | <MRL | 0 | No PFAS detected |
| Columbus Grove Village | OH6900112 | Columbus Grove | 2,137 | <MRL | <MRL | 0 | No PFAS detected |
| Columbus Public Water System | OH2504412 | Columbus | 1,309,468 | 5.3 | <MRL | 0.006 | PFOA 1–3 × its limit |
| Commercial Point Village | OH6503512 | Commercial Point | 3,497 | <MRL | <MRL | 0 | Other PFAS detected |
| Conneaut | OH0400411 | Conneaut | 12,538 | <MRL | <MRL | 0 | No PFAS detected |
| Cortland City Pws | OH7800512 | Cortland | 7,105 | <MRL | <MRL | 0 | No PFAS detected |
| Coshocton Pws | OH1600012 | Coshocton | 14,319 | <MRL | <MRL | 0 | No PFAS detected |
| Crestline Village Pws | OH1700112 | Crestline | 4,525 | <MRL | <MRL | 0 | No PFAS detected |
| Cuyahoga Falls City Pws | OH7701012 | Cuyahoga Falls | 51,114 | <MRL | <MRL | 0 | No PFAS detected |
| Dayton Public Water System | OH5703512 | Dayton | 141,407 | <MRL | 10 | 0.98 | PFOS 1–3 × its limit |
| Dayton Va Bldg 410 | OH5750618 | Dayton | 125 | <MRL | 10.5 | 1.07 | PFOS 1–3 × its limit |
| Defiance City | OH2000111 | Defiance | 16,494 | <MRL | <MRL | 0 | Other PFAS detected |
| Del-Co Water Company, Inc. | OH2101412 | Delaware | 150,000 | 4.2 | <MRL | 0.002 | PFOA 1–3 × its limit |
| Delaware City Pws | OH2100311 | Delaware | 43,895 | <MRL | <MRL | 0 | No PFAS detected |
| Delphos City | OH0200412 | Delphos | 7,101 | <MRL | <MRL | 0 | No PFAS detected |
| Delta Village | OH2600311 | Delta | 3,518 | <MRL | <MRL | 0 | Other PFAS detected |
| Dover City Pws | OH7900412 | Dover | 13,253 | <MRL | <MRL | 0 | No PFAS detected |
| Earnhart Hill Water District Pws | OH6500812 | Circleville | 10,738 | <MRL | <MRL | 0 | No PFAS detected |
| East Liverpool City | OH1500811 | East Liverpool | 12,586 | <MRL | <MRL | 0.003 | Hazard Index below its limit |
| East Palestine Village Pws | OH1500912 | East Palestine | 4,761 | <MRL | <MRL | 0 | No PFAS detected |
| Eaton Public Water System | OH6801612 | W. Alexandria | 8,400 | <MRL | <MRL | 0 | No PFAS detected |
| Elida Village | OH0200503 | Elida | 4,109 | <MRL | <MRL | 0 | Other PFAS detected |
| Elyria Water Department | OH4700411 | Lorain | 68,000 | <MRL | <MRL | 0 | No PFAS detected |
| Englewood City Pws | OH5700812 | Englewood | 13,463 | <MRL | <MRL | 0 | No PFAS detected |
| Erie Co Margaretta District | OH2200203 | Huron | 5,131 | <MRL | <MRL | 0 | No PFAS detected |
| Erie Co Perkins District | OH2200603 | Huron | 17,241 | <MRL | <MRL | 0 | No PFAS detected |
| Fairborn Public Water System | OH2900612 | Jamestown | 34,620 | <MRL | <MRL | 0 | No PFAS detected |
| Fairfield City Pws | OH0900715 | Hamilton | 44,907 | <MRL | <MRL | 0.57 | Hazard Index below its limit |
| Fairfield County Utilities Pws | OH2301912 | Lancaster | 19,113 | <MRL | <MRL | 0 | No PFAS detected |
| Felicity Village Pws | OH1300612 | Felicity | 1,573 | <MRL | <MRL | 0 | No PFAS detected |
| Findlay City Pws | OH3200111 | Findlay | 54,040 | <MRL | <MRL | 0 | No PFAS detected |
| Fostoria City | OH7400411 | Fostoria | 13,441 | <MRL | <MRL | 0 | No PFAS detected |
| Franklin Public Water System | OH8300412 | Franklin | 11,690 | <MRL | 4.1 | 0 | PFOS 1–3 × its limit |
| Fremont City | OH7200311 | Fremont | 18,319 | <MRL | <MRL | 0 | No PFAS detected |
| Gahanna City Pws | OH2501303 | Glenford | 33,258 | <MRL | <MRL | 0 | No PFAS detected |
| Galion City | OH1700211 | Galion | 10,453 | <MRL | <MRL | 0 | Other PFAS detected |
| Gallia Co Rural Water Association | OH2700012 | Gallipolis | 20,995 | 7.5 | <MRL | 0 | PFOA 1–3 × its limit |
| Gallipolis Pws | OH2700112 | Gallipolis | 7,134 | 7.2 | <MRL | 0 | PFOA 1–3 × its limit |
| Gb Fabrication | OH7049512 | Shelby | 26 | <MRL | <MRL | 0 | No PFAS detected |
| Geneva City Pws | OH0401712 | Geneva | 5,924 | <MRL | <MRL | 0 | No PFAS detected |
| Georgetown Village Pws | OH0800503 | Georgetown | 4,331 | 4.7 | <MRL | 0 | PFOA 1–3 × its limit |
| Germantown City Pws | OH5701012 | Germantown | 5,547 | <MRL | <MRL | 0 | No PFAS detected |
| Girard City | OH7801103 | Girard | 13,263 | <MRL | 20.1 | 1.032 | PFOS ≥ 3 × its limit |
| Gnadenhutten | OH7900512 | Gnadenhutten | 1,240 | <MRL | <MRL | 0 | No PFAS detected |
| Grandview Medical Center Pws | OH5750615 | Dayton | 1,850 | <MRL | 7.1 | 1.052 | PFOS 1–3 × its limit |
| Granville, Village Of | OH4500612 | Granville | 5,946 | <MRL | <MRL | 0 | No PFAS detected |
| Greene Co.-Northwest Reg Water | OH2903512 | Beavercreek | 41,895 | <MRL | <MRL | 0 | No PFAS detected |
| Greene County Eastern Regional Pws | OH2906103 | Beavercreek | 4,800 | <MRL | <MRL | 0 | No PFAS detected |
| Greenfield Twp Water District | OH2301812 | Lancaster | 490 | <MRL | <MRL | 0 | No PFAS detected |
| Greenfield Village Pws | OH3600312 | Greenfield | 4,600 | <MRL | <MRL | 0 | No PFAS detected |
| Greenville City Pws | OH1900714 | Greenville | 13,227 | <MRL | 6.3 | 0.59 | PFOS 1–3 × its limit |
| Groveport Pws | OH2501512 | Groveport | 3,229 | <MRL | <MRL | 0 | No PFAS detected |
| Guernsey Co. Water Dept. | OH3000603 | Cambridge | 8,891 | 9.8 | <MRL | 0 | PFOA 1–3 × its limit |
| Hamilton Public Water System | OH0904012 | Fairfield | 62,447 | 5.3 | <MRL | 0.412 | PFOA 1–3 × its limit |
| Harrison City Pws | OH3100812 | Harrison | 11,600 | <MRL | <MRL | 0 | No PFAS detected |
| Hdma - Benton Rd Pws | OH8035512 | Marysville | 11,025 | <MRL | <MRL | 0 | No PFAS detected |
| Hecla Water Association | OH4401612 | Ironton | 34,942 | 6.8 | <MRL | 0.552 | PFOA 1–3 × its limit |
| Hicksville Village | OH2000212 | Hicksville | 3,600 | <MRL | <MRL | 0 | No PFAS detected |
| Highland County Water Company, Inc. | OH3600514 | Hillsboro | 28,421 | <MRL | <MRL | 0 | No PFAS detected |
| Hillsboro City | OH3600614 | Hillsboro | 6,650 | <MRL | <MRL | 0 | No PFAS detected |
| Hollywood Gaming @ Mvrc | OH5055013 | Austintown | 7,304 | <MRL | <MRL | 0 | No PFAS detected |
| Honda Dma Anna Engine Plant | OH7537812 | Anna | 3,400 | <MRL | <MRL | 0 | No PFAS detected |
| Honda Dma East Liberty Wtp | OH4643512 | Marysville | 3,500 | <MRL | <MRL | 0 | No PFAS detected |
| Hubbard City Pws | OH7801415 | Hubbard | 8,362 | <MRL | <MRL | 0 | Other PFAS detected |
| Huber Heights Public Water System | OH5703612 | Huber Heights | 43,439 | <MRL | <MRL | 0 | No PFAS detected |
| Hudson City Pws | OH7701612 | Hudson | 8,385 | <MRL | <MRL | 0 | No PFAS detected |
| Huron City | OH2201011 | Huron | 6,893 | <MRL | <MRL | 0 | No PFAS detected |
| Indian Hill City Pws | OH3101112 | Cincinnati | 15,000 | <MRL | 12.4 | 0.002 | PFOS ≥ 3 × its limit |
| Ironton | OH4400711 | Ironton | 11,129 | 5.5 | <MRL | 0.67 | PFOA 1–3 × its limit |
| Jackson Co. Water Company-Wtp | OH4002012 | Jackson | 15,984 | <MRL | <MRL | 0 | No PFAS detected |
| Jackson, City Of | OH4000111 | Jackson | 9,691 | <MRL | <MRL | 0 | Other PFAS detected |
| Jackson/Milton Metro Water District Pws | OH5054212 | Youngstown | 3,728 | 4.9 | 8.5 | 0.37 | PFOS 1–3 × its limit |
| Jefferson Co W And S District - M | OH4101103 | Wintersville | 13,983 | <MRL | <MRL | 0.002 | Hazard Index below its limit |
| Jefferson Co W And S District- A | OH4100803 | Steubenville | 2,635 | <MRL | <MRL | 0.342 | Hazard Index below its limit |
| Jefferson Regional Water Authority | OH5703012 | Miamisburg | 4,813 | <MRL | <MRL | 0 | Other PFAS detected |
| Jefferson Water And Sewer District Pws | OH2504012 | Blacklick | 11,294 | <MRL | <MRL | 0 | No PFAS detected |
| Johnstown City Pws | OH4501512 | Johnstown | 5,200 | <MRL | <MRL | 0 | No PFAS detected |
| Kent City Pws | OH6701812 | Kent | 29,662 | <MRL | <MRL | 0 | No PFAS detected |
| Kenton City | OH3300612 | Kenton | 8,360 | <MRL | <MRL | 0 | No PFAS detected |
| Kings Island Pws | OH8345615 | Kings Island | 31,753 | <MRL | 28.9 | 0.002 | PFOS ≥ 3 × its limit |
| Knox County Water And Wastewater Pws | OH4202012 | Mount Vernon | 8,250 | <MRL | <MRL | 0 | No PFAS detected |
| Lake County East Water Subdistrict | OH4302911 | Painesville | 40,656 | <MRL | <MRL | 0 | No PFAS detected |
| Lake County West Water Subdistrict | OH4302411 | Painesville | 78,379 | <MRL | <MRL | 0 | No PFAS detected |
| Lakewood City Pws | OH1801003 | Lakewood | 50,942 | <MRL | <MRL | 0 | No PFAS detected |
| Lancaster City Pws | OH2301012 | Lancaster | 40,400 | <MRL | <MRL | 0 | No PFAS detected |
| Le-Ax Regional Water District Pws | OH0501111 | Athens | 19,311 | <MRL | <MRL | 0 | No PFAS detected |
| Leading Creek Conservancy District | OH5300012 | Rutland | 6,663 | 7.6 | <MRL | 0 | PFOA 1–3 × its limit |
| Lebanon City | OH8304112 | Lebanon | 20,700 | <MRL | <MRL | 0 | Other PFAS detected |
| Lebanon Correctional Institution | OH8301012 | Lebanon | 3,410 | <MRL | <MRL | 0 | No PFAS detected |
| Lexington Village | OH7002212 | Lexington | 4,825 | <MRL | <MRL | 0 | No PFAS detected |
| Licking Regional Water District | OH4505412 | Baltimore | 17,818 | <MRL | <MRL | 0 | No PFAS detected |
| Lima City | OH0200811 | Lima | 65,619 | <MRL | <MRL | 0 | Other PFAS detected |
| Little Hocking Water Association, Inc. | OH8400212 | Little Hocking | 9,892 | <MRL | <MRL | 0 | No PFAS detected |
| Lockland Village Pws | OH3101212 | Lockland | 3,486 | <MRL | <MRL | 0 | No PFAS detected |
| Logan, City Of | OH3700612 | Logan | 6,704 | <MRL | <MRL | 0 | No PFAS detected |
| Lorain City Pws | OH4700711 | Lorain | 64,152 | <MRL | <MRL | 0 | No PFAS detected |
| Lordstown Village Pws | OH7804403 | Lordstown | 3,515 | <MRL | 16 | 0.64 | PFOS ≥ 3 × its limit |
| Louisville City Pws | OH7603012 | Louisville | 9,186 | <MRL | <MRL | 0 | Other PFAS detected |
| Loveland City Pws | OH1300812 | Loveland | 12,800 | <MRL | 16 | 0.002 | PFOS ≥ 3 × its limit |
| Malvern Village Pws | OH1000112 | Malvern | 1,200 | <MRL | <MRL | 0 | No PFAS detected |
| Mansfield City | OH7002914 | Mansfield | 51,000 | <MRL | <MRL | 0 | No PFAS detected |
| Marietta City Pws | OH8400412 | Marietta | 18,707 | 5.2 | 5.6 | 0.002 | PFOS 1–3 × its limit |
| Martins Ferry Public Water System | OH0701212 | Martins Ferry | 6,980 | 6.1 | <MRL | 0.002 | PFOA 1–3 × its limit |
| Marysville City Pws | OH8000314 | Marysville | 25,571 | <MRL | <MRL | 0 | No PFAS detected |
| Maumee City | OH4800603 | Maumee | 14,286 | <MRL | <MRL | 0 | No PFAS detected |
| Maysville Regional Water | OH6001411 | White Cottage | 6,540 | 4 | <MRL | 0 | PFOA 1–3 × its limit |
| Mcdonald Village Pws | OH7802003 | Mcdonald | 4,236 | <MRL | 21.2 | 1.022 | PFOS ≥ 3 × its limit |
| Medina City Pws | OH5200514 | Medina | 25,956 | <MRL | <MRL | 0 | Other PFAS detected |
| Medina Co/Northwest Pws | OH5201903 | Medina | 46,324 | <MRL | <MRL | 0 | Other PFAS detected |
| Medina Co/Southern Water Dist Pws | OH5260712 | Columbia Station | 4,708 | <MRL | <MRL | 0 | No PFAS detected |
| Miami Co-Camp Troy Pws | OH5502503 | Troy | 3,813 | <MRL | <MRL | 0 | No PFAS detected |
| Miamisburg City Pws | OH5701212 | Miamisburg | 19,790 | <MRL | <MRL | 0 | No PFAS detected |
| Mid-Ohio Wsd - Chrisman Avenue Wtp | OH4900712 | Columbus | 10,256 | <MRL | <MRL | 0 | No PFAS detected |
| Mid-Ohio Wsd - Jackson Street Wtp | OH4901112 | Columbus | 4,467 | <MRL | <MRL | 0 | No PFAS detected |
| Mid-Ohio Wsd - Old Springfield Road Wtp | OH4901012 | Columbus | 5,176 | <MRL | <MRL | 0 | No PFAS detected |
| Middletown City Pws | OH0901712 | Trenton | 51,229 | <MRL | 4.3 | 0 | PFOS 1–3 × its limit |
| Milford City Pws | OH1301012 | Milford | 6,700 | 4.1 | 7.8 | 0.323 | PFOS 1–3 × its limit |
| Millersburg Village Pws | OH3800912 | Millersburg | 3,151 | <MRL | <MRL | 0 | No PFAS detected |
| Minerva Village Pws | OH7603812 | Minerva | 3,684 | <MRL | <MRL | 0 | No PFAS detected |
| Monroe City Pws | OH0902012 | Monroe | 15,600 | <MRL | <MRL | 0 | No PFAS detected |
| Monroe Water Systems | OH5600812 | Laings | 4,334 | <MRL | <MRL | 0 | No PFAS detected |
| Montgomery County Water Services 1 Pws | OH5701315 | Kettering | 150,207 | <MRL | 9.6 | 1.071 | PFOS 1–3 × its limit |
| Montgomery County Water Services 2 Pws | OH5701503 | Kettering | 83,033 | <MRL | 7.6 | 0.942 | PFOS 1–3 × its limit |
| Montpelier Village | OH8600912 | Montpelier | 4,280 | <MRL | <MRL | 0 | No PFAS detected |
| Mount Orab Village Pws | OH0801011 | Mount Orab | 6,607 | <MRL | <MRL | 0 | Other PFAS detected |
| Mount Vernon City Pws | OH4200812 | Mount Vernon | 16,990 | <MRL | <MRL | 0 | No PFAS detected |
| Mt Gilead Village Pws | OH5900712 | Mt Gilead | 3,503 | <MRL | <MRL | 0 | No PFAS detected |
| Munroe Falls City Pws | OH7702703 | Munroe Falls | 5,042 | <MRL | <MRL | 0 | No PFAS detected |
| Muskingum County Water - Se | OH6000412 | Zanesville | 21,540 | <MRL | <MRL | 0.002 | Hazard Index below its limit |
| Napoleon City | OH3500811 | Napoleon | 8,858 | <MRL | <MRL | 0.002 | Hazard Index below its limit |
| Nawa | OH5553612 | Tipp City | 29,974 | <MRL | <MRL | 0 | No PFAS detected |
| Nelsonville Pws | OH0501214 | Nelsonville | 6,656 | <MRL | <MRL | 0 | No PFAS detected |
| New Bremen Village | OH0600512 | New Bremen | 3,034 | <MRL | <MRL | 0 | No PFAS detected |
| New Carlisle City Pws | OH1203312 | New Carlisle | 5,800 | <MRL | <MRL | 0.003 | Hazard Index below its limit |
| New Lebanon Village Pws | OH5701812 | New Lebanon | 3,770 | <MRL | <MRL | 0 | No PFAS detected |
| New Lexington | OH6400411 | New Lexington | 5,161 | <MRL | <MRL | 0 | No PFAS detected |
| New Miami Village Pws | OH0902112 | New Miami | 3,200 | <MRL | <MRL | 0 | No PFAS detected |
| New Philadelphia City Pws | OH7900812 | New Philadelphia | 17,410 | <MRL | <MRL | 0 | No PFAS detected |
| Newark City Pws | OH4502314 | Newark | 49,934 | <MRL | <MRL | 0 | Other PFAS detected |
| Newcomerstown Village Pws | OH7900912 | Newcomerstown | 3,882 | <MRL | <MRL | 0 | No PFAS detected |
| Newton Falls City | OH7802311 | Newton Falls | 6,109 | 6.7 | 5.6 | 0.11 | PFOA 1–3 × its limit |
| Niles City Pws | OH7802403 | Niles | 21,961 | <MRL | 9 | 0.36 | PFOS 1–3 × its limit |
| Nolley Elementary School | OH7778012 | New Franklin | 600 | <MRL | <MRL | 0 | No PFAS detected |
| North Baltimore Village | OH8701611 | North Baltimore | 3,432 | <MRL | <MRL | 0 | Other PFAS detected |
| North Canton City Pws | OH7604312 | N Canton | 24,747 | <MRL | <MRL | 0 | No PFAS detected |
| North Ridgeville City Pws | OH4700803 | North Ridgeville | 37,786 | <MRL | <MRL | 0 | No PFAS detected |
| Northern Ohio Rural Water | OH3902403 | Norwalk | 18,224 | <MRL | <MRL | 0 | No PFAS detected |
| Northern Ohio Rural Water - Nw District | OH2201803 | Norwalk | 6,409 | <MRL | <MRL | 0 | No PFAS detected |
| Northern Ohio Rural Water-South District | OH3946712 | Norwalk | 5,226 | <MRL | <MRL | 0 | Other PFAS detected |
| Northern Perry Co.Water #2 | OH6402703 | New Lexington | 1,802 | <MRL | <MRL | 0 | No PFAS detected |
| Northwest Regional Water District | OH7300003 | Mcdermott | 11,059 | <MRL | <MRL | 0 | Other PFAS detected |
| Northwestern W And Sd - Oregon Wtln 200 | OH8704203 | Bowling Green | 9,629 | <MRL | <MRL | 0 | Other PFAS detected |
| Northwestern W And Sd - Portage | OH8704103 | Bowling Green | 4,776 | <MRL | <MRL | 0 | Other PFAS detected |
| Northwestern W And Sd - Toledo Svc Area | OH8752812 | Bowling Green | 19,332 | <MRL | <MRL | 0 | No PFAS detected |
| Norwalk City Pws | OH3901111 | Norwalk | 17,466 | <MRL | <MRL | 0 | Other PFAS detected |
| Norwood City Pws | OH3101703 | Norwood | 19,870 | <MRL | <MRL | 0 | No PFAS detected |
| Oak Harbor Village | OH6202603 | Oak Harbor | 4,400 | <MRL | <MRL | 0 | No PFAS detected |
| Oakdale Water District | OH6402403 | Glouster | 250 | <MRL | <MRL | 0 | No PFAS detected |
| Oakwood City Pws | OH5701915 | Oakwood | 9,572 | <MRL | <MRL | 0.352 | Hazard Index below its limit |
| Oberlin Water Department | OH4700911 | Lagrange | 8,600 | <MRL | <MRL | 0.002 | Hazard Index below its limit |
| Odrc-Pickaway Correction Pws | OH6501712 | Fredricktown | 3,376 | <MRL | <MRL | 0 | No PFAS detected |
| Old Trail School | OH7754712 | Bath | 497 | <MRL | <MRL | 0 | No PFAS detected |
| Ontario City | OH7003512 | Ontario | 6,756 | <MRL | <MRL | 0 | No PFAS detected |
| Oregon City | OH4800911 | Oregon | 19,950 | <MRL | <MRL | 0 | Other PFAS detected |
| Orrville City Pws | OH8502712 | Navarre | 8,452 | <MRL | <MRL | 0 | No PFAS detected |
| Ottawa County Regional Water District | OH6205011 | Port Clinton | 20,428 | <MRL | <MRL | 0 | Other PFAS detected |
| Ottawa Village | OH6900711 | Ottawa | 4,393 | <MRL | <MRL | 0.004 | Hazard Index below its limit |
| Oxford City Pws | OH0902312 | Somerville | 24,000 | <MRL | <MRL | 0.006 | Hazard Index below its limit |
| Painesville City Pws | OH4301611 | Mentor | 31,728 | <MRL | <MRL | 0 | No PFAS detected |
| Pataskala City | OH4502512 | Pataskala | 9,900 | <MRL | <MRL | 0 | No PFAS detected |
| Paulding Village Pws | OH6300411 | Paulding | 3,605 | <MRL | <MRL | 0 | Other PFAS detected |
| Perrysburg City Pws | OH8701803 | Whitehouse | 27,000 | <MRL | <MRL | 0 | No PFAS detected |
| Pickerington City Pws | OH2301512 | Pickerington | 19,141 | <MRL | <MRL | 0 | No PFAS detected |
| Pike Water, Inc.-Plant Pws | OH6602412 | Waverly | 15,487 | <MRL | <MRL | 0 | Other PFAS detected |
| Piqua City Pws | OH5501211 | Piqua | 20,354 | <MRL | <MRL | 0 | Other PFAS detected |
| Port Clinton City | OH6203211 | Port Clinton | 6,500 | <MRL | <MRL | 0 | No PFAS detected |
| Portage County Water Resources | OH6702812 | Ravenna | 8,606 | <MRL | <MRL | 0 | No PFAS detected |
| Portsmouth City | OH7300111 | Portsmouth | 40,475 | 5.4 | <MRL | 0.002 | PFOA 1–3 × its limit |
| Putnam Community Water Association Pws | OH8400712 | Marietta | 2,744 | 16.9 | <MRL | 0.35 | PFOA ≥ 3 × its limit |
| Rattlesnake Pws | OH2437412 | Washington Court House | 7,685 | <MRL | <MRL | 0 | No PFAS detected |
| Ravenna City Pws | OH6703211 | Ravenna | 16,000 | <MRL | <MRL | 0 | Other PFAS detected |
| Reading City Pws | OH3101812 | Reading | 9,506 | <MRL | <MRL | 0 | Other PFAS detected |
| Reynoldsburg City Pws | OH2503203 | Reynoldsburg | 37,847 | <MRL | <MRL | 0 | Other PFAS detected |
| Rittman City Pws | OH8503012 | Rittman | 6,491 | <MRL | <MRL | 0 | No PFAS detected |
| Ross County Water Co Inc | OH7101412 | Chillicothe | 35,345 | <MRL | <MRL | 0 | Other PFAS detected |
| Rural Lorain Co. Water A | OH4701803 | Lagrange | 73,125 | <MRL | <MRL | 0 | Other PFAS detected |
| Salem City | OH1502011 | New Waterford | 16,850 | <MRL | <MRL | 0 | No PFAS detected |
| Sandusky City | OH2201411 | Sandusky | 25,793 | <MRL | <MRL | 0 | No PFAS detected |
| Sanitary District #4 | OH2501003 | Columbus | 8,575 | 7.2 | <MRL | 0.005 | PFOA 1–3 × its limit |
| Scioto Co. Regional Water District #1 | OH7300212 | Lucasville | 13,820 | <MRL | <MRL | 0 | Other PFAS detected |
| Scioto Water Inc.-Rose Hill | OH7300303 | Franklin Furnace | 8,861 | <MRL | <MRL | 0 | No PFAS detected |
| Scioto Water Inc.-Sugar Camp | OH7300903 | Franklin Furnace | 6,458 | <MRL | <MRL | 0.42 | Hazard Index below its limit |
| Scranton Woods | OH2803712 | Chardon | 114 | <MRL | <MRL | 0 | No PFAS detected |
| Sebring Village Pws | OH5001911 | Sebring | 6,058 | <MRL | <MRL | 0 | No PFAS detected |
| Shadyside Public Water System | OH0701612 | Barnesville | 3,689 | 6 | <MRL | 1.175 | PFOA 1–3 × its limit |
| Sheffield Lake City Pws | OH4701103 | Sheffield Lake | 9,108 | <MRL | <MRL | 0 | No PFAS detected |
| Sheffield Village Pws | OH4701203 | Sheffield Village | 4,165 | <MRL | <MRL | 0 | No PFAS detected |
| Shelby City | OH7004511 | Shelby | 9,453 | <MRL | <MRL | 0 | Other PFAS detected |
| Sidney City Pws | OH7501214 | Sidney | 20,614 | <MRL | <MRL | 0 | No PFAS detected |
| South Lebanon City Pws | OH8301312 | South Lebanon | 7,792 | <MRL | <MRL | 0 | No PFAS detected |
| South Point Village | OH4401212 | South Point | 4,133 | <MRL | <MRL | 0.852 | Hazard Index below its limit |
| Southern Perry Co-Congo | OH6401603 | Crooksville | 4,029 | <MRL | <MRL | 0 | No PFAS detected |
| Southwest Regional Water District | OH0903912 | Hamilton | 42,856 | <MRL | <MRL | 0.002 | Hazard Index below its limit |
| Springboro Pws | OH8301412 | Springboro | 19,263 | 6.9 | 5.7 | 0.382 | PFOA 1–3 × its limit |
| Springfield City Pws | OH1204412 | Springfield | 60,680 | <MRL | <MRL | 0 | No PFAS detected |
| St Marys City | OH0600612 | St Marys | 9,356 | <MRL | <MRL | 0 | No PFAS detected |
| St. Clairsville, City Of Pws | OH0701516 | St. Clairsville | 5,097 | 6.4 | <MRL | 0 | PFOA 1–3 × its limit |
| Stark County Water District | OH7607303 | Canton | 6,690 | <MRL | <MRL | 0 | No PFAS detected |
| Steubenville, City Of | OH4102411 | Steubenville | 17,000 | <MRL | <MRL | 0 | No PFAS detected |
| Stow Public Water System | OH7704503 | Stow | 35,437 | <MRL | <MRL | 0 | No PFAS detected |
| Streetsboro City Pws | OH6705003 | Streetsboro | 15,105 | <MRL | <MRL | 0 | No PFAS detected |
| Sunday Creek Valley Water Pws | OH0501503 | Millfield | 5,451 | <MRL | <MRL | 0 | No PFAS detected |
| Swanton Village | OH2601011 | Swanton | 3,855 | <MRL | <MRL | 0 | No PFAS detected |
| Sylvania City | OH4801303 | Sylvania | 21,618 | <MRL | <MRL | 0 | No PFAS detected |
| Tallmadge City Pws | OH7704703 | Tallmadge | 18,394 | <MRL | <MRL | 0 | No PFAS detected |
| Tate-Monroe Water Association Pws | OH1301312 | New Richmond | 24,092 | 7.4 | <MRL | 0 | PFOA 1–3 × its limit |
| Tcmsd-Wilkshire Hills Pws | OH7901612 | Bolivar | 6,587 | <MRL | <MRL | 0 | No PFAS detected |
| Timberlake Water System | OH2501812 | Columbus | 1,600 | <MRL | <MRL | 0 | No PFAS detected |
| Timmons Elementary School | OH2861312 | Chagrin Falls | 375 | <MRL | <MRL | 0 | No PFAS detected |
| Toledo City Of | OH4801411 | Toledo | 360,000 | <MRL | <MRL | 0 | Other PFAS detected |
| Toronto Pws | OH4102811 | Toronto | 5,676 | <MRL | <MRL | 0.002 | Hazard Index below its limit |
| Trenton City Pws | OH0903012 | Trenton | 13,012 | <MRL | <MRL | 0.311 | Hazard Index below its limit |
| Tri-County Block And Brick | OH2637912 | Swanton | 31 | <MRL | <MRL | 0 | No PFAS detected |
| Trotwood City Pws | OH5702403 | Trotwood | 9,000 | <MRL | <MRL | 0.002 | Hazard Index below its limit |
| Troy City Pws | OH5501612 | Rossburg | 26,305 | <MRL | <MRL | 0 | No PFAS detected |
| Trumbull Co. - Bazetta/Champion | OH7804303 | Vienna | 8,270 | <MRL | <MRL | 0 | Other PFAS detected |
| Trumbull Co. - Howland Twp Pws | OH7806303 | Vienna | 6,396 | 4.4 | 13 | 0.56 | PFOS ≥ 3 × its limit |
| Trumbull Co. - Southeast Pws | OH7803203 | Vienna | 9,931 | 4 | 9.1 | 0.42 | PFOS 1–3 × its limit |
| Tuppers Plains/Chester Water District | OH5300612 | Long Bottom | 16,087 | <MRL | <MRL | 0 | No PFAS detected |
| Twin City Water And Sewer District Pws | OH7901711 | Dennison | 9,224 | <MRL | <MRL | 0 | No PFAS detected |
| Uh - Cleveland Medical Center | OH1841113 | Cleveland | 11,395 | <MRL | <MRL | 0 | Other PFAS detected |
| Union City Pws | OH5702512 | Union | 7,000 | 4.8 | <MRL | 0.01 | PFOA 1–3 × its limit |
| Upper Sandusky City | OH8800511 | Upper Sandusky | 6,698 | <MRL | <MRL | 0 | No PFAS detected |
| Urbana City Pws | OH1101212 | Urbana | 11,428 | <MRL | <MRL | 0 | Other PFAS detected |
| Van Wert City | OH8100611 | Van Wert | 10,846 | <MRL | <MRL | 0 | No PFAS detected |
| Vermilion City | OH2201511 | Vermilion | 10,594 | <MRL | <MRL | 0 | No PFAS detected |
| Wadsworth City Pws | OH5201712 | Wadsworth | 24,356 | <MRL | <MRL | 0 | No PFAS detected |
| Wapakoneta City Pws | OH0600712 | Wapakoneta | 11,000 | <MRL | <MRL | 0 | No PFAS detected |
| Warren City Pws | OH7803811 | Warren | 49,130 | <MRL | <MRL | 0 | Other PFAS detected |
| Warren Co. Franklin Area Pws | OH8301603 | Lebanon | 36,725 | <MRL | <MRL | 0 | No PFAS detected |
| Warren Co. Socialville Pws | OH8304203 | 13,216 | <MRL | <MRL | 0 | Other PFAS detected | |
| Warren Comm W And S Assn 2 | OH8402703 | Marietta | 7,215 | 20 | <MRL | 0.003 | PFOA ≥ 3 × its limit |
| Warren County | OH8301512 | Lebanon | 99,000 | <MRL | <MRL | 0 | No PFAS detected |
| Washington Court House Pws | OH2400714 | Williamsport | 14,100 | <MRL | <MRL | 0 | No PFAS detected |
| Waterford Water/Sewer Association | OH8401112 | Waterford | 770 | <MRL | <MRL | 0.003 | Hazard Index below its limit |
| Waterville City | OH4801503 | Waterville | 6,500 | <MRL | <MRL | 0 | Other PFAS detected |
| Wauseon City Pws | OH2600111 | Wauseon, | 7,568 | <MRL | <MRL | 0.462 | Hazard Index below its limit |
| Waverly City Pws | OH6600912 | Waverly | 4,433 | <MRL | <MRL | 0.53 | Hazard Index below its limit |
| Waynesville Village Pws | OH8302012 | Waynesville | 4,100 | <MRL | <MRL | 0 | No PFAS detected |
| Waynoka Regional Water And Sewer Dist | OH0800811 | Sardinia | 1,860 | <MRL | <MRL | 0 | No PFAS detected |
| Wellington Village Pws | OH4701511 | Wellington | 4,802 | <MRL | <MRL | 0 | No PFAS detected |
| Wellston City Pws | OH4001912 | Wellston | 5,846 | <MRL | <MRL | 0 | Other PFAS detected |
| West Carrollton City Pws | OH5702812 | Camden | 8,361 | <MRL | <MRL | 0 | No PFAS detected |
| West Jefferson Village Pws | OH4902012 | West Jefferson | 4,488 | <MRL | <MRL | 0 | No PFAS detected |
| West Milton Village Pws | OH5501711 | West Milton | 4,890 | <MRL | <MRL | 0 | No PFAS detected |
| Western Water Company | OH8300512 | Morrow | 39,508 | <MRL | 14.1 | 0 | PFOS ≥ 3 × its limit |
| Westerville City Pws | OH2503411 | Pataskala | 39,000 | <MRL | <MRL | 0 | Other PFAS detected |
| Whitehouse Village | OH4801612 | Whitehouse | 5,200 | <MRL | <MRL | 0 | Other PFAS detected |
| Willard City | OH3901511 | Willard | 7,099 | <MRL | <MRL | 0 | No PFAS detected |
| Wilmington City Pws | OH1401211 | Wilmington | 12,401 | <MRL | 7.3 | 0.7 | PFOS 1–3 × its limit |
| Wintersville Village Pws | OH4103003 | Wintersville | 3,924 | <MRL | <MRL | 0.002 | Hazard Index below its limit |
| Wooster City Pws | OH8504512 | Wooster | 26,618 | 4.8 | <MRL | 0.337 | PFOA 1–3 × its limit |
| Wright State University | OH2902012 | Dayton | 8,948 | <MRL | <MRL | 0 | No PFAS detected |
| Wright-Patterson Afb Area A Pws | OH2903412 | Vandalia | 16,551 | <MRL | 5 | 1.304 | Hazard Index 1–3 × its limit |
| Wright-Patterson Afb Area B Pws | OH2903312 | Vandalia | 11,034 | 5.5 | 14 | 1.902 | PFOS ≥ 3 × its limit |
| Wyoming City Pws | OH3102212 | Cincinnati | 9,700 | <MRL | <MRL | 0 | No PFAS detected |
| Xenia City Pws | OH2902812 | Xenia | 29,000 | <MRL | <MRL | 0 | No PFAS detected |
| Yellow Springs Village Pws | OH2903012 | Yellow Springs | 3,761 | <MRL | 9.2 | 0 | PFOS 1–3 × its limit |
| Youngstown City Pws | OH5002303 | Youngstown | 130,530 | <MRL | 19.3 | 0.75 | PFOS ≥ 3 × its limit |
| Zanesville Pws | OH6002712 | Zanesville | 29,381 | <MRL | <MRL | 0.002 | Hazard Index below its limit |
Not tested under UCMR 5 (1,348)
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 |
|---|---|---|---|---|---|
| 16490 Spruce Properties, Llc | OH2860112 | NTNCWS | Cleveland | 85 | Geauga County |
| 9988 Kinsman Holdings Llc | OH2840012 | NTNCWS | Cleveland | 40 | Geauga County |
| A And R Reck Mobile Home Park | OH5500312 | CWS | Bradford | 50 | Miami County |
| A And R Union City Park Mhp Pws | OH1900812 | CWS | Bradford | 85 | Darke County |
| Adco Products, Llc | OH2876913 | NTNCWS | Chagrin Falls | 50 | Geauga County |
| Addyston Village Pws | OH3100012 | CWS | Addyston | 900 | Hamilton County |
| Adena Village Pws | OH4100003 | CWS | Adena | 820 | Harrison County, Jefferson County |
| Advanced Drainage Systems Pws | OH8561312 | NTNCWS | Wooster | 50 | Wayne County |
| Advanced Drainage Systems- Butler | OH0939612 | NTNCWS | New Miami | 171 | Butler County |
| Adventures In Learning Daycare Pws | OH5260212 | NTNCWS | Brunswick | 85 | Medina County |
| Aep Dresden Facility Adm Pws | OH6045112 | NTNCWS | Dresden | 40 | Muskingum County |
| Agape Christian Academy | OH2838912 | NTNCWS | Burton | 136 | Geauga County |
| Albany Village Pws | OH0500003 | CWS | Albany | 901 | Athens County |
| Alexandria Village Pws | OH4504203 | CWS | Alexandria | 493 | Licking County |
| Alger Village Pws | OH3300112 | CWS | Alger | 943 | Hardin County |
| Alive Vineyard | OH4564312 | NTNCWS | Newark | 167 | Licking County |
| All Seasons Mhp | OH6700812 | CWS | Mogadore | 498 | Portage County |
| Allegheny Wesleyan College | OH1555012 | NTNCWS | Salem | 85 | Columbiana County |
| Altercare Of Hartville | OH7602212 | CWS | Hartville | 198 | Stark County |
| Amanda Village Pws | OH2300012 | CWS | Amanda | 757 | Fairfield County |
| American Augers | OH0333112 | NTNCWS | West Salem | 180 | Ashland County |
| Amesville Public Water System | OH0500112 | CWS | Amesville | 255 | Athens County |
| Amrize-Paulding | OH6332212 | NTNCWS | Paulding | 130 | Paulding County |
| Anchor Fabricators Inc | OH5742012 | NTNCWS | Clayton | 32 | Montgomery County |
| Anderson Vreeland | OH8633612 | NTNCWS | Bryan | 55 | Williams County |
| Andover Village Pws | OH0400012 | CWS | Andover | 1,019 | Ashtabula County |
| Angels For Animals Pws | OH5055016 | NTNCWS | Canfield | 175 | Mahoning County |
| Angstrom Metal Stampings, Llc | OH5548012 | NTNCWS | Tipp City | 40 | Miami County |
| Anna Village Pws | OH7500012 | CWS | Anna | 1,558 | Shelby County |
| Ansonia Village Pws | OH1900012 | CWS | Ansonia | 1,174 | Darke County |
| Anthony Wayne School | OH1930512 | NTNCWS | Greenville | 135 | Darke County |
| Antwerp Village Pws | OH6300012 | CWS | Antwerp | 1,741 | Paulding County |
| Apostolate For Family Consecration | OH4137112 | NTNCWS | Bloomingdale | 50 | Jefferson County |
| Apple Creek Village Pws | OH8500112 | CWS | Apple Creek | 1,190 | Wayne County |
| Aqua Ohio - Auburn Lakes Pws | OH2803612 | CWS | Mentor | 658 | Geauga County |
| Aqua Ohio - Beechcrest | OH6705212 | CWS | Massillon | 1,496 | Portage County |
| Aqua Ohio - Firestone Trace | OH7709412 | CWS | Massillon | 336 | Summit County |
| Aqua Ohio - La Rue Village Pws | OH5100312 | CWS | Marion | 800 | Marion County |
| Aqua Ohio - Lake White Pws | OH6600312 | CWS | Westerville | 1,229 | Pike County |
| Aqua Ohio - Mansfield System #01 | OH7002812 | CWS | Massillon | 813 | Richland County |
| Aqua Ohio - Mansfield System #03 | OH7005812 | CWS | Massillon | 525 | Richland County |
| Aqua Ohio - Mansfield System #04 | OH7001412 | CWS | Massillon | 142 | Richland County |
| Aqua Ohio - Mansfield System #05 | OH7004912 | CWS | Massillon | 123 | Richland County |
| Aqua Ohio - Mansfield System #06 | OH7005612 | CWS | Massillon | 412 | Richland County |
| Aqua Ohio - Mansfield System #07 | OH7001612 | CWS | Massillon | 766 | Richland County |
| Aqua Ohio - Mansfield System #08 | OH7003212 | CWS | Massillon | 170 | Richland County |
| Aqua Ohio - Mansfield System #10 | OH7006612 | CWS | Massillon | 40 | Richland County |
| Aqua Ohio - Mansfield System #11 | OH7003312 | CWS | Massillon | 280 | Richland County |
| Aqua Ohio - Midvale | OH7900612 | CWS | Massillon | 2,147 | Tuscarawas County |
| Aqua Ohio - Mohawk Pws | OH1000812 | CWS | Massillon | 2,376 | Carroll County |
| Aqua Ohio - Norlick | OH8601012 | CWS | Mentor | 345 | Williams County |
| Aqua Ohio - Seneca | OH8601512 | CWS | Mentor | 750 | Williams County |
| Aqua Ohio - Shepard Hills Pws | OH7704212 | CWS | Mentor | 725 | Summit County |
| Aqua Ohio - Southwood Estates | OH0301512 | CWS | Massillon | 81 | Ashland County |
| Aqua Ohio - Timberbrook Pw | OH2502712 | CWS | Westerville | 865 | Franklin County |
| Aqua Ohio - Tomahawk Utilities | OH1502512 | CWS | Struthers | 715 | Columbiana County |
| Aqua Ohio - Worthington Hills Pws | OH2502812 | CWS | Westerville | 2,500 | Franklin County |
| Arbors At Mifflin | OH7006412 | CWS | Mansfield | 172 | Richland County |
| Arcadia Village Pws | OH3200903 | CWS | Arcadia | 564 | Hancock County |
| Arcanum Village Pws | OH1900112 | CWS | Arcanum | 2,100 | Darke County |
| Arlington Village Pws | OH3200012 | CWS | Arlington | 1,474 | Hancock County |
| Arrowhead Lake Mhp | OH4800112 | CWS | West Covina | 327 | Lucas County |
| Art Sense | OH1950624 | NTNCWS | Centerville | 60 | Darke County |
| Ashland Co West Holmes Career Center | OH0334612 | NTNCWS | Ashland | 300 | Ashland County |
| Ashland Co West Holmes Career Center 2 | OH0300212 | NTNCWS | Ashland | 350 | Ashland County |
| Ashley Village Pws | OH2100011 | CWS | Ashley | 1,198 | Delaware County |
| Asm International | OH2857812 | NTNCWS | Middleburg Heights | 102 | Geauga County |
| Athens Co., The Plains S.D. 1 Pws | OH0500303 | CWS | Millfield | 3,276 | Athens County |
| Attica Village | OH7400011 | CWS | Attica | 1,148 | Seneca County |
| Auburn Skilled Nursing & Rehabilitation | OH1502712 | CWS | Salem | 50 | Columbiana County |
| Auria Holmesville, Llc Pws | OH3842412 | NTNCWS | Holmesville | 160 | Holmes County |
| Aurora City - Portage Pws | OH6700003 | CWS | Aurora | 191 | Portage County |
| Aurora Estates | OH6703312 | CWS | Columbus | 500 | Portage County |
| Autumn Hills Healthcare Community | OH2800212 | CWS | Huntsburg | 87 | Geauga County |
| Avon Mobile Home Park | OH7700312 | CWS | Akron | 138 | Summit County |
| Axalta Coating Systems Pws | OH8543912 | NTNCWS | Orrville | 61 | Wayne County |
| Ayersville Water And Sewer District | OH2000903 | CWS | Defiance | 2,372 | Defiance County |
| Bailey Lakes Village | OH0300312 | CWS | West Salem | 374 | Ashland County |
| Bainbridge Center Bldg. | OH2852612 | NTNCWS | Pepper Pike | 250 | Geauga County |
| Bainbridge Village Pws | OH7100012 | CWS | Bainbridge | 900 | Ross County |
| Bainbrook Water Company Pws | OH2803112 | CWS | Middleburg Heights | 339 | Geauga County |
| Baird Brothers Sawmill, Inc. | OH5052512 | NTNCWS | Canfield | 105 | Mahoning County |
| Baltimore Village Pws | OH2300112 | CWS | Baltimore | 2,995 | Fairfield County |
| Bates Metal Products,Inc | OH7947712 | NTNCWS | Port Washington | 70 | Tuscarawas County |
| Bath Elementary School 2 Pws | OH7750612 | NTNCWS | Bath | 720 | Summit County |
| Bath Township Office | OH7745412 | NTNCWS | Bath | 33 | Summit County |
| Battelle-West Jefferson | OH4930212 | NTNCWS | Columbus | 220 | Madison County |
| Bayloff Stamped Products-Kinsman | OH7850312 | NTNCWS | Kinsman | 56 | Trumbull County |
| Beach City Lumber Pws | OH7951724 | NTNCWS | Canton | 25 | Tuscarawas County |
| Beach City Village Pws | OH7600212 | CWS | Beach City | 1,031 | Stark County |
| Bear Custom Products | OH8554612 | NTNCWS | Wooster | 108 | Wayne County |
| Beaver Pws | OH6600012 | CWS | Beaver | 480 | Pike County |
| Beaver Creek Estates | OH2800012 | CWS | Chesterland | 39 | Geauga County |
| Beaverdam Village Pws | OH0200012 | CWS | Beaverdam | 319 | Allen County |
| Beechwood Island Estates | OH6700212 | CWS | Kent | 122 | Portage County |
| Behlen Manufacturing Company | OH1239612 | NTNCWS | Springfield | 58 | Clark County |
| Belle Acres Mobile Home Park | OH7800212 | CWS | Warren | 25 | Trumbull County |
| Belle Center Village Pws | OH4600012 | CWS | Belle Center | 834 | Logan County |
| Bellville Village | OH7000012 | CWS | Bellville | 1,918 | Richland County |
| Belmont Public Water System | OH0700315 | CWS | Belmont | 400 | Belmont County |
| Ben Logan Elementary School | OH4645912 | NTNCWS | Belfontaine | 697 | Logan County |
| Ben Logan High School | OH4643912 | NTNCWS | Belfontaine | 603 | Logan County |
| Ben Logan Middle School | OH4646012 | NTNCWS | Belfontaine | 671 | Logan County |
| Berlin Water Company | OH3800012 | CWS | Berlin | 1,896 | Holmes County |
| Bethel Township Water System Pws | OH5502703 | CWS | Troy | 543 | Miami County |
| Bethesda Public Water System | OH0700511 | CWS | Bethesda | 1,382 | Belmont County |
| Bettsville Village | OH7400112 | CWS | Bettsville | 692 | Seneca County |
| Beverly Village Pws | OH8400112 | CWS | Waterford | 1,900 | Washington County |
| Biery Cheese Company | OH7659812 | NTNCWS | Louisville | 454 | Stark County |
| Big Prairie Community Water Company | OH3800112 | CWS | Wooster | 200 | Holmes County |
| Bill Denoon Lumber Co Mill | OH4137912 | NTNCWS | Bergholz | 45 | Jefferson County |
| Birchwood Manor Mhc New | OH6700322 | CWS | Farmington Hills | 150 | Portage County |
| Birchwood Manor Mhc Old | OH6700312 | CWS | Farmington Hills | 665 | Portage County |
| Blackbrook Valley Estates | OH6700412 | CWS | Kent | 180 | Portage County |
| Blanchard Valley Hospital Pavilion | OH3248618 | NTNCWS | Findlay | 500 | Hancock County |
| Bloomfield High School | OH7835212 | NTNCWS | North Bloomfield | 115 | Trumbull County |
| Bloomfield Water Company | OH3800812 | CWS | Millersburg | 950 | Holmes County |
| Bloomville Village Pws | OH7400212 | CWS | Bloomville | 956 | Seneca County |
| Bolivar Village Pws | OH7900212 | CWS | Bolivar | 998 | Tuscarawas County |
| Bomac Mobile Home Park | OH1601312 | CWS | New Philadelphia | 45 | Coshocton County |
| Botkins Village Pws | OH7500212 | CWS | Botkins | 1,250 | Shelby County |
| Bowerston Shale Company | OH4555512 | NTNCWS | Newark | 28 | Licking County |
| Bowerston Village Pws | OH3400112 | CWS | Bowerston | 483 | Carroll County, Harrison County |
| Bowersville Village Pws | OH2900212 | CWS | Bowersville | 360 | Greene County |
| Boyds Kinsman Home Pws | OH7804712 | CWS | Kinsman | 94 | Trumbull County |
| Boyer Kindergarten Center | OH7774012 | NTNCWS | Atwater | 150 | Summit County |
| Bradner Village Pws | OH8700412 | CWS | Bradner | 985 | Wood County |
| Breezeway Mobile Manor | OH1503512 | CWS | Columbiana | 46 | Columbiana County |
| Bremen Village | OH2300212 | CWS | Bremen | 1,425 | Fairfield County |
| Brentwood Community Mhp Llc | OH6300212 | CWS | Springville | 48 | Paulding County |
| Brewster Village Pws | OH7600512 | CWS | Brewster | 2,113 | Stark County |
| Briarwood Estates Mhp | OH7000112 | CWS | Kent | 222 | Richland County |
| Bridgeport Public Water System | OH0700612 | CWS | Bridgeport | 2,830 | Belmont County |
| Brightstar Fostoria East Mhp Pws | OH7401412 | CWS | Cincinnati | 65 | Seneca County |
| Brightstar Fremont Mhp Pws | OH7200012 | CWS | Cincinnati | 100 | Sandusky County |
| Brightstar Lima Mhp Pws | OH0200712 | CWS | Cincinnati | 480 | Allen County |
| Brilliant Water And Sewer | OH4100412 | CWS | Brilliant | 2,000 | Jefferson County |
| Bristol Local School | OH7835312 | NTNCWS | Bristolville | 682 | Trumbull County |
| Brook Park Estates Mhp Pws | OH7401312 | CWS | Lima | 75 | Seneca County |
| Brookdale Mobile Home Park | OH2302012 | CWS | Lancaster | 60 | Fairfield County |
| Brookfield Acres Mhc Pws | OH7800312 | CWS | Brookfield | 571 | Trumbull County |
| Brookside Village Mhp Pws | OH1200112 | CWS | Corona Del Mar | 475 | Clark County |
| Brookville Lake Estates | OH5700612 | CWS | Brookville | 211 | Montgomery County |
| Brookwood Mhp Pws | OH1200212 | CWS | Springfield | 145 | Clark County |
| Brunersburg Wd - Airport Pws | OH2001403 | CWS | Defiance | 40 | Defiance County |
| Brunersburg Wd - Brunersburg Pws | OH2001103 | CWS | Defiance | 500 | Defiance County |
| Brunersburg Wd - Evansport Pws | OH2001203 | CWS | Defiance | 268 | Defiance County, Williams County |
| Brunersburg Wd - Tinora Pws | OH2001303 | NTNCWS | Defiance | 859 | Defiance County |
| Brunswick Hills Mhp | OH5200012 | CWS | Seattle | 50 | Medina County |
| Buckeye Ford Inc | OH4939812 | NTNCWS | London | 100 | Madison County |
| Buckeye Lake, Village Of Pws | OH4564712 | CWS | Buckeye Lake | 2,746 | Fairfield County, Licking County |
| Buckeye Packaging, Inc. | OH7660412 | NTNCWS | Alliance | 80 | Stark County |
| Buckeye Trails - L | OH6501512 | CWS | Orem | 400 | Pickaway County |
| Buckeye Trails - M | OH6501812 | CWS | Orem | 330 | Pickaway County |
| Built-Rite Box & Crate | OH8564728 | NTNCWS | Wooster | 50 | Wayne County |
| Bunkerhill Cheese Co. | OH3830712 | NTNCWS | Millersburg | 60 | Holmes County |
| Burbank Parke Pws | OH8563912 | CWS | Burbank | 85 | Wayne County |
| Burr Oak Regional Water District | OH0501311 | CWS | Millfield | 1,994 | Athens County |
| Burton Village Pws | OH2800312 | CWS | Burton | 1,520 | Geauga County |
| Butler Village | OH7000412 | CWS | Butler | 940 | Richland County |
| By Way Mobile Home Park | OH2500212 | CWS | San Francisco | 150 | Franklin County |
| Caesars Village Mhp Pws | OH8300012 | CWS | Dayton | 90 | Warren County |
| Camden, Village Of | OH6800112 | CWS | Camden | 2,050 | Preble County |
| Campbell Soup Supply Co | OH3531411 | NTNCWS | Napoleon | 1,300 | Henry County |
| Canaan Community Mhp | OH4900112 | CWS | Dallas | 420 | Madison County |
| Canaan Middle School | OH4930912 | NTNCWS | Plain City | 450 | Madison County |
| Canal Dover Furniture | OH3849112 | NTNCWS | Millersburg | 55 | Holmes County |
| Canal Pointe Industrial Park Pws | OH2346603 | CWS | Canal Winchester | 1,721 | Fairfield County, Franklin County |
| Candlewood Lake Association Inc | OH5901012 | CWS | Mount Gillead | 1,710 | Morrow County |
| Cantex, Inc. | OH6782712 | NTNCWS | Aurora | 40 | Portage County |
| Capitol Aluminum And Glass | OH7251712 | NTNCWS | Bellevue | 50 | Sandusky County |
| Caravan Village Mhp | OH6503312 | CWS | Corona Del Mar | 170 | Pickaway County |
| Carbo Forge | OH7251912 | NTNCWS | Fremont | 50 | Sandusky County |
| Carbon Hill Water Association | OH3700103 | CWS | Carbon Hill | 910 | Hocking County |
| Cardinal Operating Co. 3 | OH4130812 | NTNCWS | Brilliant | 110 | Jefferson County |
| Cardinal Operating Company 1/ 2 Pws | OH4130912 | NTNCWS | Brilliant | 168 | Jefferson County |
| Cardinal-New Paris Health | OH6800212 | CWS | New Paris | 96 | Preble County |
| Cardington Village Pws | OH5900112 | CWS | Cardington | 2,079 | Morrow County |
| Carlisle City Pws | OH8303803 | CWS | Carlisle | 1,675 | Montgomery County, Warren County |
| Carmeuse Lime - Maple Grove Operations | OH7430612 | NTNCWS | Bettsville | 60 | Seneca County |
| Carroll Hills Industries Pws | OH1043212 | NTNCWS | Carrollton | 46 | Carroll County |
| Carroll Village Pws | OH2300312 | CWS | Carroll | 524 | Fairfield County |
| Carroll Water And Sewer | OH6205111 | CWS | Oak Harbor | 2,288 | Ottawa County |
| Carrollton Village | OH1000012 | CWS | Carrollton | 3,055 | Carroll County |
| Carvel Manor Mhp | OH6500312 | CWS | Durham | 148 | Pickaway County |
| Cassens Transport Co | OH8036512 | NTNCWS | Marysville | 44 | Union County |
| Casstown Pws | OH5562374 | CWS | Troy | 271 | Miami County |
| Castle Nursing Homes, Inc Pws | OH3801112 | CWS | Millersburg | 428 | Holmes County |
| Castlebar Apartments Pws | OH7606922 | CWS | Canton | 50 | Stark County |
| Catalina Mobile Home Park | OH0900512 | CWS | Middletown | 1,280 | Butler County |
| Catawba Village Pws | OH1200312 | CWS | Springfield | 241 | Clark County |
| Cedar Creek Mhp | OH7000512 | CWS | Westborough | 154 | Richland County |
| Central Christian High School | OH8533412 | NTNCWS | Kidron | 300 | Wayne County |
| Ceva Logistics | OH8038612 | NTNCWS | East Liberty | 75 | Logan County, Union County |
| Chagrin Valley Early Learning Center | OH2862712 | NTNCWS | South Russell | 101 | Geauga County |
| Chardon Estates | OH2802612 | CWS | Columbus | 217 | Geauga County |
| Chardon Woods Of Journey | OH2804212 | CWS | Chardon | 650 | Geauga County |
| Chateau Estates Mhp Pws | OH1200412 | CWS | Cincinnati | 430 | Clark County |
| Chauncey | OH0500512 | CWS | Chauncey | 1,428 | Athens County |
| Chester Commons Plaza-C/B Development-Ca | OH2859112 | NTNCWS | Ann Arbor | 443 | Geauga County |
| Chester Plaza | OH2876950 | NTNCWS | Burton | 276 | Geauga County |
| Chester Square Plaza | OH2856712 | NTNCWS | Painesville | 70 | Geauga County |
| Chester Town Center Pws | OH2867812 | NTNCWS | Chesterland | 145 | Geauga County |
| Chester Town Hall | OH2856812 | NTNCWS | Chesterland | 50 | Geauga County |
| Chesterhill Village Pws | OH5800112 | CWS | Chesterhill | 823 | Morgan County |
| Chickasaw Village | OH5402212 | CWS | Chickasaw | 358 | Mercer County |
| Choctaw Utilities, Inc. | OH4900212 | CWS | London | 2,200 | Madison County |
| Christ The Word Church | OH4846316 | NTNCWS | Sylvania | 550 | Lucas County |
| Christi Water System Inc | OH2001003 | CWS | Defiance | 483 | Defiance County |
| Christian Childrens Home | OH8504912 | CWS | Wooster | 55 | Wayne County |
| Christiansburg Village Pws | OH1100112 | CWS | Christiansburg | 526 | Champaign County |
| Church Of The Saviour | OH8553312 | NTNCWS | Wooster | 385 | Wayne County |
| Cim Group East Liberty | OH4652621 | NTNCWS | Phoenix | 160 | Logan County |
| Cincinnati Childrens Hospt Liberty Pws | OH0939716 | NTNCWS | Cincinnati | 313 | Butler County |
| Cincinnati Childrens Med Center Col Hill | OH3139917 | NTNCWS | Cincinnati | 722 | Hamilton County |
| Cincinnati Incorporated | OH3130612 | NTNCWS | Harrison | 278 | Hamilton County |
| Cincinnati Va Medical Center | OH3139918 | NTNCWS | Cincinnati | 4,152 | Hamilton County |
| Clampco Products | OH5255712 | NTNCWS | Wadsworth | 250 | Medina County |
| Clarington Village Pws | OH5600012 | CWS | Clarington | 440 | Monroe County |
| Clark County Lawrenceville Pws | OH1202812 | CWS | Springfield | 302 | Clark County |
| Clark County Limecrest Pws | OH1253012 | CWS | Springfield | 215 | Clark County |
| Clark County Rockway Pws | OH1201203 | CWS | Springfield | 383 | Clark County |
| Clark-Shawnee Local Pk-6 School Pws | OH1253214 | NTNCWS | Springfield | 1,120 | Clark County |
| Clarksburg Village Pws | OH7100212 | CWS | Clarksburg | 500 | Ross County |
| Clarksville Village Pws | OH1400203 | CWS | Clarksville | 562 | Clinton County |
| Clear Fork High School | OH7041812 | NTNCWS | Bellville | 1,178 | Richland County |
| Clear Water Corporation | OH6100103 | CWS | Sarahsville | 2,670 | Noble County |
| Clearfork Mhp | OH7000612 | CWS | Bellville | 318 | Richland County |
| Cleveland Ave Properties | OH7788412 | NTNCWS | N. Canton | 40 | Summit County |
| Cleveland Cliffs Coshocton Works | OH1633912 | NTNCWS | Coshocton | 418 | Coshocton County |
| Cnc Precision Machine, Inc. Pws | OH2876918 | NTNCWS | Burton | 100 | Geauga County |
| Coal Grove | OH4400012 | CWS | Southpoint | 2,167 | Lawrence County |
| Coalton | OH4000003 | CWS | Coalton | 663 | Jackson County |
| Coble Village Mhp | OH3900112 | CWS | Bethlehem | 95 | Huron County |
| Coblentz Chocolate Company Pws | OH3850817 | NTNCWS | Walnut Creek | 80 | Holmes County |
| College Corner Water | OH6800311 | CWS | College Corner | 387 | Butler County, Preble County |
| Colonial Hills Mhp | OH7000312 | CWS | Mansfield | 185 | Richland County |
| Colonial Terrace Mhc Llc | OH4201512 | CWS | Warren | 110 | Knox County |
| Colonial Villa Mhc, Llc | OH5000612 | CWS | Crofton | 450 | Mahoning County |
| Colony Village Mhp | OH2300512 | CWS | Bexley | 75 | Fairfield County |
| Columbia Park Water System | OH1841012 | CWS | Olmsted Twp | 2,716 | Cuyahoga County |
| Columbiana County-County Home Rd Pws | OH1566312 | CWS | Lisbon | 200 | Columbiana County |
| Comet Mobile Home Park | OH7700812 | CWS | North Canton | 25 | Summit County |
| Community Gardens Mhp | OH2500512 | CWS | Grove City | 74 | Franklin County |
| Community Health & Wellness Partners | OH4640112 | NTNCWS | West Liberty | 200 | Logan County |
| Company Wrench Pws | OH2351212 | NTNCWS | Carroll | 94 | Fairfield County |
| Concord Care Center Of Hartford | OH7800812 | CWS | Fowler | 99 | Trumbull County |
| Continental Village Pws | OH6900212 | CWS | Delphos | 1,153 | Putnam County |
| Convoy Village | OH8100112 | CWS | Convoy | 1,100 | Van Wert County |
| Coolville Village Pws | OH0500603 | CWS | Coolville | 859 | Athens County |
| Cooper Farms Central Egg Processing | OH5437812 | NTNCWS | Coldwater | 95 | Mercer County |
| Cooper Farms Cooked Meats Van Wert | OH8134212 | NTNCWS | Van Wert | 600 | Van Wert County |
| Cooper Hatchery | OH6332712 | NTNCWS | Oakwood | 80 | Paulding County |
| Cornell Abraxas Ohio | OH7033512 | CWS | Shelby | 150 | Richland County |
| Cornerstone Christian School | OH3842212 | NTNCWS | Holmesville | 165 | Holmes County |
| Corning, Village Of | OH6400003 | CWS | Corning | 563 | Perry County |
| Corrchoice Llc | OH7635012 | NTNCWS | Massillon | 112 | Stark County |
| Cory Rawson Schools | OH3232112 | NTNCWS | Rawson | 595 | Hancock County |
| Cottonwood Enterprises | OH4634612 | CWS | Clearwater | 30 | Logan County |
| Country Haven Mhp Pws | OH1201412 | CWS | Cincinnati | 234 | Clark County |
| Country Hills Mhp | OH4500312 | CWS | Newark | 48 | Licking County |
| Country Inn Enhanced Living Center | OH6333512 | CWS | Paulding | 40 | Paulding County |
| Country Lane Gardens Hc | OH2300712 | CWS | Thornville | 190 | Fairfield County |
| Country Lawn Center | OH7601412 | CWS | Navarre | 116 | Stark County |
| Country Meadow Care Center | OH7003612 | CWS | Bellville | 80 | Richland County |
| Country Meadows Condo. | OH5500012 | CWS | Piqua | 65 | Miami County |
| Country Pointe Wooster Sub-Acute Pws | OH8505012 | CWS | Wooster | 84 | Wayne County |
| Country Side Mobile Home | OH2500612 | CWS | Indianapolis | 180 | Franklin County |
| Countryside Estates | OH6704712 | CWS | Morgantown | 375 | Portage County |
| Covington Village Pws | OH5500112 | CWS | Covington | 2,718 | Miami County |
| Creative Learning Works | OH1248612 | NTNCWS | Springfield | 56 | Clark County |
| Creative Mold And Machine Pws | OH2861412 | NTNCWS | Newbury | 35 | Geauga County |
| Creston Village | OH8500312 | CWS | Creston | 2,171 | Wayne County |
| Crestview Local Schools | OH7049412 | NTNCWS | Ashland | 1,400 | Richland County |
| Crestwood Hills C And R Association | OH7000812 | CWS | Bellville | 564 | Richland County |
| Cridersville Village Pws | OH0600212 | CWS | Criderville | 2,410 | Auglaize County |
| Crooksville | OH6400111 | CWS | Crooksville | 2,534 | Perry County |
| Crossroads Church Of God | OH0253812 | NTNCWS | Lima | 575 | Allen County |
| Crouse Mobile Home Park & Sales, Llc | OH0902912 | CWS | Hamilton | 247 | Butler County |
| Crown Hill Manor Pws | OH8561412 | CWS | Rittman | 25 | Wayne County |
| Cyfah Llc Woodrow Corporation | OH1243612 | NTNCWS | Springfield | 30 | Clark County |
| D + S Hillcrest Pws | OH8532012 | NTNCWS | Wooster | 75 | Wayne County |
| Daleside Systems, Inc. | OH5200112 | CWS | Hinckley | 25 | Medina County |
| Dalton Village Pws | OH8500412 | CWS | Dalton | 2,000 | Wayne County |
| Damascus Elementary Pws | OH5054112 | NTNCWS | Beloit | 326 | Mahoning County |
| Danville Village Pws | OH4200112 | CWS | Danville | 994 | Knox County |
| Darbydale Elementary School Pws | OH2570725 | NTNCWS | Grove City | 370 | Franklin County |
| Darbyville Village Pws | OH6503412 | CWS | Williamsport | 293 | Pickaway County |
| Dawes Arboretum | OH4539912 | NTNCWS | Newark | 289 | Licking County |
| Dawsons Mobile Home Park Pws | OH6601412 | CWS | Piketon | 51 | Pike County |
| Dayspring Assisted Living And Care | OH7004112 | CWS | Mansfield | 95 | Richland County |
| Dayton Va Bldg 320 Pod A | OH5750619 | CWS | Dayton | 95 | Montgomery County |
| Dayton Va Bldg 320 Pod B | OH5750620 | NTNCWS | Dayton | 72 | Montgomery County |
| Dayton Va Bldg 320 Pod C | OH5750621 | NTNCWS | Dayton | 85 | Montgomery County |
| Dayton Va Bldg 320 Pod D | OH5750622 | NTNCWS | Dayton | 68 | Montgomery County |
| Dayton Vamc Bldg 350 Hospice Building | OH5750630 | NTNCWS | Dayton | 25 | Montgomery County |
| Dayton Vamc Water Treatment Plant-Bld330 | OH5750616 | NTNCWS | Dayton | 3,216 | Montgomery County |
| Deer Creek Co-Op | OH6901412 | CWS | Ottawa | 265 | Putnam County |
| Deer Lake Mobile Park | OH2800612 | CWS | Chesterland | 40 | Geauga County |
| Deer Meadows Mhp | OH5001212 | CWS | Morgantown | 242 | Mahoning County |
| Deer Run Mc | OH1500112 | CWS | Salem | 106 | Columbiana County, Mahoning County |
| Deersville Village Pws | OH3400312 | CWS | Gnadenhutten | 82 | Harrison County |
| Degraff Village Pws | OH4600512 | CWS | Degraff | 1,225 | Logan County |
| Delta 77 Apartments Pws | OH7700006 | CWS | South Euclid | 50 | Summit County |
| Delta Village - Fulton County | OH2637915 | NTNCWS | Delta | 564 | Fulton County |
| Deshler Village | OH3500112 | CWS | Deshler | 1,578 | Henry County |
| Dfc Mobile Home Park | OH0400512 | CWS | Warren | 85 | Ashtabula County |
| Dillonvale | OH4100512 | CWS | Mingo Junction | 665 | Jefferson County |
| Dlh Bowles, Inc. | OH7607112 | NTNCWS | Canton | 234 | Stark County |
| Donnelsville Elementary Campus | OH1251912 | NTNCWS | New Carlisle | 450 | Clark County |
| Doylestown Village Pws | OH8500612 | CWS | Doylestown | 3,051 | Wayne County |
| Dresden Pws | OH6000212 | CWS | Dresden | 2,000 | Muskingum County |
| Dry Fork Pointe Mhp | OH3100612 | CWS | Erlanger | 230 | Hamilton County |
| Dunfalls Association, Inc. | OH6000303 | CWS | Dunfalls | 266 | Muskingum County |
| Dunkirk Village Pws | OH3300212 | CWS | Dunkirk | 875 | Hardin County |
| Duramax Marine Llc | OH2870612 | NTNCWS | Hiram | 82 | Geauga County |
| Dutch Maid Logistics | OH3946914 | NTNCWS | Willard | 55 | Huron County |
| Dws Mantel Properties Llc Pws | OH7799967 | NTNCWS | Akron | 190 | Summit County |
| E Pallet, Inc | OH7950412 | NTNCWS | Sugarcreek | 53 | Tuscarawas County |
| East Canton Village Pws | OH7601503 | CWS | Louisville | 1,606 | Stark County |
| East Central Ohio Business Park | OH6042812 | NTNCWS | Zaneville | 642 | Muskingum County |
| East Clinton High School | OH1432112 | NTNCWS | Lees Creek | 600 | Clinton County |
| East Sparta Village Pws | OH7601612 | CWS | East Sparta | 850 | Stark County |
| East Trailers, Llc | OH6738712 | NTNCWS | Randolph | 500 | Portage County |
| Eastview Community Water Association | OH7000912 | CWS | Mansfield | 1,100 | Richland County |
| Eastwood Elementary School Pws | OH8753214 | NTNCWS | Pemberville | 737 | Wood County |
| Eastwood High School | OH8742912 | NTNCWS | Pemberville | 613 | Wood County |
| Eastwood Manufacturing Pws | OH8563512 | NTNCWS | Orrville | 28 | Wayne County |
| Eastwood Middle School | OH8749812 | NTNCWS | Pemberville | 425 | Wood County |
| Echo Lake Community Association | OH5200212 | CWS | Hinckley | 58 | Medina County |
| Echoing Hills Village | OH1600811 | CWS | Warsaw | 25 | Coshocton County |
| Eci Inc Corporate Office | OH7432012 | NTNCWS | Tiffin | 125 | Seneca County |
| Edgerton Village | OH8600312 | CWS | Edgerton | 1,881 | Williams County |
| Edgewood Estates | OH7004412 | CWS | Strongsville | 96 | Richland County |
| Edgewood Terrace | OH1600212 | CWS | Sugarcreek | 87 | Coshocton County |
| Edinburg United Ch School | OH6777212 | NTNCWS | Ravenna | 170 | Portage County |
| Edison Park Plaza | OH7669212 | NTNCWS | Hartville | 142 | Stark County |
| Edon Village | OH8600512 | CWS | Edon | 783 | Williams County |
| Education Alternatives | OH7772112 | NTNCWS | Brook Park | 320 | Summit County |
| Ehrwsd Duvall Service Area Pws | OH6542812 | NTNCWS | Circleville | 220 | Pickaway County |
| Eldorado, Village Of | OH6800512 | CWS | Eldorado | 539 | Preble County |
| Elgin Local Schools Pws | OH5143912 | NTNCWS | Marion | 1,321 | Marion County |
| Elida Mennonite School | OH0251912 | NTNCWS | Elida | 66 | Allen County |
| Elizabeth Township Community Center | OH5537712 | NTNCWS | Troy | 71 | Miami County |
| Elmore Village | OH6200712 | CWS | Woodville | 1,421 | Ottawa County |
| Enchanted Acres Mhp | OH2500712 | CWS | Lockbourne | 750 | Franklin County |
| Enon Heights Mhp Pws | OH1202012 | CWS | Enon | 85 | Clark County |
| Enon Village Pws | OH1201812 | CWS | Enon | 2,415 | Clark County |
| Erie Co Huron East District | OH2200403 | CWS | Huron | 1,713 | Erie County |
| Erie Co Huron South District | OH2200703 | CWS | Huron | 1,086 | Erie County |
| Erie Co Vermilion District | OH2200803 | CWS | Huron | 930 | Erie County |
| Erie Co Vermilion W District | OH2201703 | CWS | Huron | 54 | Erie County |
| Etem Remediation One, Llc | OH4136412 | NTNCWS | Stratton | 200 | Jefferson County |
| Evans Family Ranch Camp | OH1244812 | NTNCWS | New Carlisle | 72 | Clark County |
| Evergreen Edgewood Mhp Pws | OH1201712 | CWS | Kettering | 80 | Clark County |
| Evergreen Poplar Village Mhp Pws | OH7401212 | CWS | Fostoria | 128 | Seneca County |
| Expressview Comm Water Association | OH7001012 | CWS | Mansfield | 300 | Richland County |
| Fair Haven Shelby County Home | OH7501112 | CWS | Minster | 290 | Shelby County |
| Fairbanks Elementary School Pws | OH8039912 | NTNCWS | Milford Center | 497 | Union County |
| Fairbanks Middle And High School | OH8031512 | NTNCWS | Milford Center | 650 | Union County |
| Fairlane Water Co. | OH6701312 | CWS | Akron | 354 | Portage County |
| Fairlawn K-12 School | OH7542512 | NTNCWS | Sidney | 650 | Shelby County |
| Fairport Harbor Village Pws | OH4300411 | CWS | Fairport Harbor | 3,180 | Lake County |
| Fairway Terrace Mhp Pws | OH1202312 | CWS | Springfield | 800 | Clark County |
| Faith Life Church Pws | OH4565512 | NTNCWS | New Albany | 900 | Licking County |
| Farmersville Village Pws | OH5700912 | CWS | Brookville | 975 | Montgomery County |
| Fayette Co-Lakewood Hills Subdivision | OH2438714 | CWS | Washington Court House | 200 | Fayette County |
| Fayette Co.-Culpepper Subdivision | OH2400112 | CWS | Washington Court House | 450 | Fayette County |
| Fayette Village | OH2600412 | CWS | Fayette | 1,340 | Fulton County |
| Fayetteville Village Pws | OH0800411 | CWS | Fayetteville | 309 | Brown County |
| Field High School | OH6740112 | NTNCWS | Mogadore | 610 | Portage County |
| Field Middle School | OH6740212 | NTNCWS | Mogadore | 525 | Portage County |
| Fieldstone Farm Therapeutic Riding Cente | OH2866612 | NTNCWS | Chagrin Falls | 220 | Geauga County |
| Fin Feather Fur Outfitters | OH0345412 | NTNCWS | Ashland | 1,607 | Ashland County |
| Firelands Manor Mhp Pws | OH3946912 | CWS | Akron | 235 | Huron County |
| First Baptist Church Of New Carlisle-Day | OH5552112 | NTNCWS | New Carlisle | 145 | Miami County |
| First Steps Early Learning Center | OH2855412 | NTNCWS | Chesterland | 85 | Geauga County |
| Five Point Mhp | OH8704312 | CWS | Maumee | 60 | Wood County |
| Flat Ridge Elementary School | OH3832412 | NTNCWS | Millersburg | 112 | Holmes County |
| Fletcher Village Pws | OH5500412 | CWS | Fletcher | 461 | Miami County |
| Flextur Pws | OH8563612 | NTNCWS | Dalton | 60 | Wayne County |
| Florida Village | OH3501203 | CWS | Florida | 450 | Henry County |
| Flushing Village Pws | OH0700912 | CWS | Flushing | 803 | Belmont County |
| Fohl Village Mhp | OH7601912 | CWS | Morgantown | 440 | Carroll County, Stark County |
| Forest Hills Mhp | OH7001212 | CWS | Columbus | 78 | Richland County |
| Forest View Mobile Home | OH8500712 | CWS | Canton | 63 | Wayne County |
| Forest Village | OH3300312 | CWS | Forest | 1,354 | Hardin County |
| Fort Hamilton Hospital Pws | OH0939921 | NTNCWS | Dayton | 950 | Butler County |
| Fort Loramie Village Pws | OH7500312 | CWS | Fort Loramie | 1,524 | Shelby County |
| Fort Recovery Industries | OH5432512 | NTNCWS | Fort Recovery | 220 | Mercer County |
| Forty Corners Mobile Village | OH7602012 | CWS | Akron | 225 | Stark County |
| Fostoria Automotive Distribution Center | OH7448712 | NTNCWS | Bellevue | 37 | Seneca County |
| Fostoria Mobile Estates | OH7400712 | CWS | Fostoria | 281 | Seneca County |
| Fountaine Apartments | OH7674412 | CWS | Independence | 32 | Stark County |
| Fowler Mobile Home Park | OH7801012 | CWS | Fowler | 69 | Trumbull County |
| Fox Run Estates Pws | OH6703112 | CWS | Mogadore | 495 | Portage County |
| Foxlair Farms Mhp Inc. | OH6502512 | CWS | Columbus | 275 | Pickaway County |
| Frankfort Village Pws | OH7100712 | CWS | Frankfort | 1,100 | Ross County |
| Franklin Monroe School New Pws | OH1950512 | NTNCWS | Pitsburg | 792 | Darke County |
| Franks Mobile Home Park | OH7701212 | CWS | Akron | 164 | Summit County |
| Frazeysburg Pws | OH6000612 | CWS | Frazeysburg | 1,340 | Muskingum County |
| Fredericksburg Village Pws | OH8500812 | CWS | Fredericksburg | 420 | Wayne County |
| Fredericktown Village | OH4200212 | CWS | Fredericktown | 2,648 | Knox County |
| Freeport Village Pws | OH3400412 | CWS | Freeport | 400 | Harrison County |
| Fresh Meadows Pws | OH7603412 | CWS | Lake Success | 100 | Stark County |
| Fryburg Door | OH3848712 | NTNCWS | Millersburg | 150 | Holmes County |
| Ft Recovery Village | OH5400212 | CWS | Fort Recovery | 1,501 | Mercer County |
| Fulton/Lucas Waterline | OH2601403 | NTNCWS | Wauseon | 350 | Fulton County |
| G And S Bar And Wire, Llc | OH8559412 | NTNCWS | Wooster | 51 | Wayne County |
| Galehouse Construction Pws | OH8560912 | NTNCWS | Doylestown | 30 | Wayne County |
| Galloway Water System Pws | OH2570758 | CWS | Columbus | 350 | Franklin County |
| Gambier Village Pws | OH4200403 | CWS | Gambier | 2,300 | Knox County |
| Garden Acres Water Company Pws | OH1202412 | CWS | Springfield | 260 | Clark County |
| Garrettsville Village Pws | OH6701412 | CWS | Garrettsville | 2,325 | Portage County |
| Geauga County Services Center Pws | OH2868112 | CWS | Chardon | 570 | Geauga County |
| Geauga County-Bainbridge | OH2804003 | CWS | Chardon | 3,000 | Cuyahoga County, Geauga County |
| Geauga Medical Bldg | OH2860912 | NTNCWS | Novelty | 210 | Geauga County |
| Genacross Family And Youth Services Pws | OH3500912 | CWS | Toledo | 70 | Henry County |
| Genoa Village | OH6201003 | CWS | Genoa | 3,110 | Ottawa County |
| Gerber Wood Products | OH8564727 | NTNCWS | Kidron | 30 | Wayne County |
| Gerbers Poultry Llc | OH8537712 | NTNCWS | Apple Creek | 546 | Wayne County |
| Gettysburg Village Pws | OH1900512 | CWS | Gettysburg | 513 | Darke County |
| Gh & A-Brick Reclamation Yard | OH2637913 | NTNCWS | Delta | 50 | Fulton County |
| Ghent Square Limited | OH7746912 | NTNCWS | Bath | 25 | Summit County |
| Giant Eagle 179 Pws | OH7759212 | NTNCWS | Bedford | 540 | Summit County |
| Gibsonburg Village Pws | OH7200412 | CWS | Gibsonburg | 2,506 | Sandusky County |
| Glade Run Mennonite Church School | OH1042212 | NTNCWS | Mechanicstown | 39 | Carroll County |
| Glandorf Village | OH6901303 | CWS | Glandorf | 1,001 | Putnam County |
| Glendale Village Pws | OH3100712 | CWS | Glendale | 2,500 | Hamilton County |
| Glenford Village | OH6402503 | CWS | Glenford | 450 | Perry County |
| Glenmont Village Pws | OH3800312 | CWS | Glenmont | 280 | Holmes County |
| Glenridge Mobile Home Park | OH8501012 | CWS | Northfield | 120 | Wayne County |
| Global Connection Academy | OH2850512 | NTNCWS | Willoughby Hills | 289 | Geauga County |
| Glouster Public Water System | OH0500703 | CWS | Glouster | 1,659 | Athens County |
| Golden Heritage Egg Farm | OH1950623 | NTNCWS | Rossburg | 90 | Darke County |
| Golf Galaxy Golfworks, Inc. | OH4545612 | NTNCWS | Newark | 85 | Licking County |
| Good Vibrations Pws | OH7799948 | NTNCWS | Twinsburg | 50 | Summit County |
| Goodyear - Airship Ops. | OH6781912 | NTNCWS | Mogadore | 40 | Portage County |
| Gospel Haven Mennonite Church Pws | OH3850512 | NTNCWS | Millersburg | 450 | Holmes County |
| Grace Evangelical Church | OH2565512 | NTNCWS | Hilliard | 311 | Franklin County |
| Grace Fellowship Center | OH2548912 | NTNCWS | Hilliard | 130 | Franklin County |
| Grafton Village Pws | OH4700511 | CWS | Grafton | 2,769 | Lorain County |
| Graham High School | OH1132212 | NTNCWS | St. Paris | 735 | Champaign County |
| Grand Lake Estates | OH5400312 | CWS | New Knoxville | 103 | Mercer County |
| Grand Rapids Village | OH8700711 | CWS | Grand Rapids | 1,500 | Wood County |
| Grandview Heights Civic Association Pws | OH1100412 | CWS | Saint Paris | 120 | Champaign County |
| Grandview Mhp A Pws | OH4202712 | CWS | Mount Vernon | 74 | Knox County |
| Grandview Mhp B | OH4202112 | CWS | Mount Vernon | 47 | Knox County |
| Granger Lake Condo 1 Pws | OH5202112 | CWS | Medina | 131 | Medina County, Summit County |
| Granger Lake Condo 4 Pws | OH5202212 | CWS | Medina | 108 | Medina County |
| Granger Lake Condos 2 And 3 | OH5202312 | CWS | Medina | 63 | Medina County |
| Gratis Village Pws | OH6800612 | CWS | Gratis | 990 | Preble County |
| Graymont Dolime (Oh) | OH6254112 | NTNCWS | Genoa | 60 | Ottawa County |
| Great Lakes Cheese - Hiram Pws | OH2866812 | NTNCWS | Hiram | 1,000 | Geauga County |
| Great Lakes Cheese-Headquarters | OH2876952 | NTNCWS | Hiram | 325 | Geauga County |
| Green Acres Mhp | OH0300512 | CWS | Kent | 80 | Ashland County |
| Green Acres Mobile Estates | OH1000412 | CWS | Plainfield | 51 | Carroll County |
| Green Meadow Mhp-Hancock Co | OH3200812 | CWS | Lima | 30 | Hancock County |
| Green Meadows Estates | OH8505212 | CWS | Wooster | 109 | Wayne County |
| Green Meadows Health And Wellness Center | OH7605212 | CWS | Louisville | 182 | Stark County |
| Green Meadows Mhp | OH4500712 | CWS | Johnstown | 51 | Licking County |
| Green Meadows Mobile Home Park | OH4901812 | CWS | London | 730 | Madison County |
| Green Springs Village Pws | OH7400512 | CWS | Green Springs | 1,592 | Sandusky County, Seneca County |
| Green Valley Mobile Home Park | OH6201212 | CWS | Elmore | 82 | Ottawa County |
| Greene Co.-Southwest Reg Water | OH2903912 | CWS | Beavercreek | 857 | Greene County |
| Greene County - Fairborn | OH2956203 | CWS | Beavercreek | 743 | Greene County |
| Greene County - Kitridge | OH2905003 | CWS | Beavercreek | 184 | Greene County |
| Greenlawn Condos | OH1204912 | CWS | Springfield | 203 | Clark County |
| Greenlawn Estates Mhp | OH6045817 | CWS | Zanesville | 480 | Muskingum County |
| Greenon Athletic Building | OH1231712 | NTNCWS | Enon | 129 | Clark County |
| Greentree Mobile Home Park | OH4900512 | CWS | Durham | 170 | Madison County |
| Greentree Water Company | OH1800812 | CWS | Moreland Hills | 56 | Cuyahoga County |
| Greenville Church Of God Pws | OH1949412 | NTNCWS | Greenville | 200 | Darke County |
| Greenwich Village Pws | OH3900312 | CWS | Grafton | 1,476 | Huron County |
| Greenwood Mobile Home Park | OH6201312 | CWS | Port Clinton | 77 | Ottawa County |
| Grove City Church Of God | OH2569712 | NTNCWS | Grove City | 188 | Franklin County |
| Grover Hill Elementary School | OH6330912 | NTNCWS | Haviland | 312 | Paulding County |
| Guggisberg Cheese | OH3847212 | NTNCWS | Millersburg | 130 | Holmes County |
| Guilford Highlands Mobile Home Park Pws | OH1504112 | CWS | Lisbon | 103 | Columbiana County |
| Guilford Lake Estates | OH1503412 | CWS | Tallmadge | 130 | Columbiana County |
| Gurney Elementary School | OH2833412 | NTNCWS | Chagrin Falls | 500 | Geauga County |
| Gustavus Senior Care | OH7856327 | NTNCWS | Farmdale | 32 | Trumbull County |
| Hamden Village Pws | OH8200003 | CWS | Hamden | 970 | Vinton County |
| Hamersville Village Pws | OH0800603 | CWS | Hamersville | 925 | Brown County |
| Hametown Baptist Church School | OH7721512 | NTNCWS | Norton | 72 | Summit County |
| Hamler Village | OH3500312 | CWS | Hamler | 580 | Henry County |
| Hanley Acres Water Association | OH7001512 | CWS | Mansfield | 85 | Richland County |
| Hanley Village Water Association | OH7005412 | CWS | Mansfield | 95 | Richland County |
| Harmony Estates Mobile Home Park | OH1202512 | CWS | South Charleston | 507 | Clark County |
| Harrison County Home | OH3400712 | CWS | Cadiz | 34 | Harrison County |
| Harrison Machine & Plastic Corp | OH6777512 | NTNCWS | Garrettsville | 34 | Portage County |
| Hartville Christian School Pws | OH7653812 | NTNCWS | Hartville | 45 | Stark County |
| Hartville Marketplace Pws | OH7673312 | NTNCWS | Hartville | 1,495 | Stark County |
| Harvest Square Mobile Home Park | OH1100512 | CWS | Dallas | 345 | Champaign County |
| Hayden Heights Mhp | OH2501612 | CWS | Morgantown | 188 | Franklin County |
| Hayesville Village | OH0300712 | CWS | Hayesville | 448 | Ashland County |
| Hcwsd - East Cadiz | OH3439717 | CWS | Cadiz | 191 | Harrison County |
| Hcwsd - Georgetown | OH3400503 | CWS | Cadia | 242 | Harrison County |
| Hcwsd - Germano Water And Sewer | OH3400612 | CWS | Cadiz | 169 | Harrison County, Jefferson County |
| Hcwsd-Crimm Road Pws | OH3439712 | NTNCWS | Cadia | 70 | Harrison County |
| Hcwsd-Piedmont Pws | OH3401212 | CWS | Cadia | 178 | Belmont County, Harrison County |
| Hcwsd-Unionvale-Kenwood | OH3401503 | CWS | Cadia | 257 | Harrison County |
| Hdt Expeditionary Systems Inc | OH7056312 | NTNCWS | Solon | 25 | Richland County |
| Heartland Christian School Pws | OH1560512 | NTNCWS | Columbiana | 126 | Columbiana County |
| Heatherwood Community Water Assoc Pws | OH7001712 | CWS | Mansfield | 177 | Richland County |
| Heatherwood Terrace Townhouses | OH7006012 | CWS | Minneapolis | 411 | Richland County |
| Hebron Village Pws | OH4501012 | CWS | Hebron | 2,368 | Licking County |
| Heritage Classical Academy | OH7751022 | NTNCWS | Peninsula | 209 | Summit County |
| Heritage Green Condominium Assoc Pws | OH8562512 | CWS | Dalton | 119 | Wayne County |
| Heritage Truck Equipment Pws | OH7677637 | NTNCWS | Hartville | 130 | Stark County |
| Hermann Pickle Company | OH6789727 | NTNCWS | Garrettsville | 60 | Portage County |
| Hershey Montessori Farm School | OH2869012 | NTNCWS | Huntsburg | 100 | Geauga County |
| Hershey Montessori School Comm Ctr Pws | OH2875312 | NTNCWS | Huntsburg | 100 | Geauga County |
| Hexpol Compounding - Burton Pws | OH2830412 | NTNCWS | Burton | 169 | Geauga County |
| Hickory Grove Mobile Home Community | OH1101312 | CWS | Urbana | 70 | Champaign County |
| Hidden Acres Mhp | OH0300812 | CWS | West Salem | 85 | Ashland County |
| Hidden Valley Mhp Pws | OH7500412 | CWS | Bradford | 85 | Shelby County |
| High Point Villa Apts. | OH7709012 | CWS | Clinton | 55 | Summit County |
| Highland Ridge W And S Association Inc | OH8403203 | CWS | Lowell | 3,022 | Washington County |
| Hillandale Farms-Hicksville | OH2036412 | NTNCWS | Hicksville | 100 | Defiance County |
| Hillcrest Estates Mobile Home Court | OH3301212 | CWS | Ada | 49 | Hardin County |
| Hillsdale Community Water Association Pw | OH7001912 | CWS | Mansfield | 160 | Richland County |
| Hillsdale School Pk-12 Pws | OH0346121 | NTNCWS | Jeromesville | 1,056 | Ashland County |
| Hillside Mhp | OH7002012 | CWS | Port Clinton | 69 | Richland County |
| Hinckley Elementary School New Pws | OH5260915 | NTNCWS | Hinckley | 450 | Medina County |
| Hinckley Preparatory Academy | OH5235612 | NTNCWS | Marion | 412 | Medina County |
| Hiram Village Pws | OH6701612 | CWS | Hiram | 1,406 | Portage County |
| Hocking Hills Elementary School | OH3740012 | NTNCWS | Logan | 320 | Hocking County |
| Holden Arboretum | OH4337419 | NTNCWS | Kirtland | 398 | Lake County |
| Holgate Village | OH3500512 | CWS | Holgate | 1,150 | Henry County |
| Holiday Shores Mhp Pws | OH4600812 | CWS | Lakeview | 67 | Logan County |
| Holloway Public Water System | OH0701112 | CWS | Holloway | 360 | Belmont County |
| Holly Hill Health Care Residence | OH2801312 | CWS | Newbury | 202 | Geauga County |
| Holmes By Products Pws | OH3849012 | NTNCWS | Millersburg | 32 | Holmes County |
| Holmes Cheese Co. Pws | OH3850814 | NTNCWS | Millersburg | 45 | Holmes County |
| Holmes County Garage | OH3833012 | NTNCWS | Millersburg | 25 | Holmes County |
| Holmes County Jail | OH3800512 | CWS | Holmesville | 180 | Holmes County |
| Holmes Lumber Office | OH2131612 | NTNCWS | Sunbury | 75 | Delaware County |
| Holmes-Wayne Electric Cooperative Inc Pw | OH3849512 | NTNCWS | Millersburg | 38 | Holmes County |
| Homestead Manor Mhp | OH6705112 | CWS | Mantua | 178 | Portage County |
| Honda Dma Trans Manufacturing Oh Div | OH4642712 | NTNCWS | Russells Point | 1,600 | Logan County |
| Honey Creek Village Mhp Pws | OH1202612 | CWS | Cincinnati | 225 | Clark County |
| Honey Run Christian School Pws | OH3850712 | NTNCWS | Killbuck | 132 | Holmes County |
| Hope Community Church Of The Nazarene | OH2347612 | NTNCWS | Carroll | 305 | Fairfield County |
| Hopedale Village Pws | OH3400811 | CWS | Hopedale | 984 | Harrison County |
| Hopewell Inn Pws | OH7855112 | NTNCWS | Mesopotamia | 60 | Trumbull County |
| Hopewell-Loudon School | OH7449612 | NTNCWS | Bascom | 890 | Seneca County |
| House Of Jacob | OH1600412 | CWS | Coshocton | 28 | Coshocton County |
| Houston K-12 School | OH7542312 | NTNCWS | Houston | 928 | Shelby County |
| Houston Plumbing Pws | OH4536412 | NTNCWS | Newark | 73 | Licking County |
| Howes Hens Pws | OH1950618 | NTNCWS | St Henry | 50 | Darke County |
| Hubbell Power Systems/Ohio Brass | OH5253712 | NTNCWS | Cschrader@Hubbell.Com | 90 | Medina County |
| Hudson Estates Pws | OH7702512 | CWS | Morgantown | 410 | Summit County |
| Huntsburg Community Center | OH2844212 | NTNCWS | Huntsburg | 94 | Geauga County |
| Hyponex Corporation | OH8559212 | NTNCWS | Shreve | 40 | Wayne County |
| Independence Education Center | OH2032612 | NTNCWS | Archbold | 130 | Defiance County |
| Indian Lake Rehabilitation Center | OH4602612 | CWS | Lakeview | 53 | Logan County |
| Indian Springs | OH7704912 | CWS | Peninsula | 136 | Summit County |
| Inn At Honey Run | OH3843912 | NTNCWS | Millersburg | 100 | Holmes County |
| Inn At The Pines Alf & Mc | OH2876919 | CWS | Hiram | 50 | Geauga County |
| Insource Technologies Pws | OH6334119 | NTNCWS | Paulding | 255 | Paulding County |
| Int Culinary Arts Sciences Inst (Icasi) | OH2873912 | NTNCWS | Chesterland | 70 | Geauga County |
| Interval Brotherhood Home | OH7708012 | CWS | Akron | 136 | Summit County |
| Ipl Dayton Inc | OH1241812 | NTNCWS | Urbana | 181 | Champaign County, Clark County |
| Ironrock Capital-Plant | OH7669112 | NTNCWS | Canton | 125 | Stark County |
| Island Creek Homeowners | OH5001812 | CWS | Beloit | 50 | Mahoning County, Portage County |
| Jackson Center Village Pws | OH7500512 | CWS | Jackson Center | 1,462 | Shelby County |
| Jackson Co. Water Company-O | OH4001803 | CWS | Jackson | 53 | Jackson County |
| Jacksonville Village Pws | OH0501003 | CWS | Jacksonville | 481 | Athens County |
| Jacques Mobile Home Park, Llc | OH2801412 | CWS | Birmingham | 280 | Geauga County |
| Jamestown Village Pws | OH2901712 | CWS | Jamestown | 1,997 | Greene County |
| Jefferson Co W&S District- J | OH4101003 | CWS | Steubenville | 896 | Jefferson County |
| Jefferson Co W&S District- O | OH4101203 | CWS | Steubenville | 340 | Jefferson County |
| Jefferson Co.San.Dist.-G Pws | OH4100903 | CWS | Wintersville | 990 | Jefferson County |
| Jefferson Lodge Mobile Home | OH4900612 | CWS | West Jefferson | 400 | Madison County |
| Jeffersonville Village Pws | OH2400612 | CWS | Jeffersonville | 1,356 | Fayette County |
| Jennings Local School | OH6945812 | NTNCWS | Fort Jennings | 452 | Putnam County |
| Jeromesville Village | OH0300912 | CWS | Jeromesville | 500 | Ashland County |
| Jersey Baptist Church | OH4553612 | NTNCWS | New Albany | 368 | Licking County |
| Jerusalem Evangelical Lutheran Daycare | OH5237512 | NTNCWS | Wadsworth | 167 | Medina County |
| Jess Howard Electric - Office | OH2547512 | NTNCWS | Blacklick | 25 | Franklin County |
| Jewett Village | OH3400912 | CWS | Jewett | 650 | Harrison County |
| Jilco Industries/Preferred Airparts Pws | OH8563412 | NTNCWS | Apple Creek | 80 | Wayne County |
| Johnson Mobile Home Park | OH6502312 | CWS | Grove City | 72 | Pickaway County |
| Jonathan Alder Junior High School | OH4932812 | NTNCWS | Plain City | 426 | Madison County |
| Jonathan Alder Pioneer High School Pws | OH4945212 | NTNCWS | Plain City | 683 | Madison County |
| Joseph Badger Local School Pws | OH7854712 | NTNCWS | Kinsman | 750 | Trumbull County |
| Junction Auto Sales, Inc | OH2834212 | NTNCWS | Chardon | 55 | Geauga County |
| Junction Buick | OH2870012 | NTNCWS | Chardon | 55 | Geauga County |
| Junction City | OH6400212 | CWS | Junction City | 819 | Perry County |
| Just 4 Kidz Childcare & Learning Center | OH2873412 | NTNCWS | Chardon | 70 | Geauga County |
| Just Cricket Condo Association | OH6705912 | CWS | Brimfield | 178 | Portage County |
| K And B Molded Products | OH5747512 | NTNCWS | Brookville | 65 | Montgomery County |
| Kalida Village Pws | OH6900512 | CWS | Kalida | 1,542 | Putnam County |
| Kalmbach Feeds - Main Office | OH8840812 | NTNCWS | Upper Sandusky | 150 | Wyandot County |
| Kalmbach Feeds - Psd Development Pws | OH8841613 | NTNCWS | Upper Sandusky | 220 | Wyandot County |
| Kalmbach Feeds - Rek Associates Pws | OH8841614 | NTNCWS | Upper Sandusky | 100 | Wyandot County |
| Keim Lumber Inc Pws 2 | OH3849812 | NTNCWS | Charm | 600 | Holmes County |
| Kelleys Island Village | OH2201111 | CWS | Kelleys Island | 3,125 | Erie County |
| Ken Stewarts Lodge Pws | OH7753412 | NTNCWS | Akron | 40 | Summit County |
| Kenston High School | OH2873712 | NTNCWS | Chagrin Falls | 930 | Geauga County |
| Kenston Middle School | OH2844412 | NTNCWS | Chagrin Falls | 515 | Geauga County |
| Kettering Health Cancer Center | OH5750629 | NTNCWS | Dayton | 46 | Montgomery County |
| Kettering Health Greene Memorial | OH2958717 | NTNCWS | Dayton | 211 | Greene County |
| Kettering Health Main Campus | OH5750626 | NTNCWS | Dayton | 3,946 | Montgomery County |
| Kettering Health Miamisburg | OH5750628 | NTNCWS | Dayton | 702 | Montgomery County |
| Kettering Health Soin Medical Center | OH2958716 | NTNCWS | Dayton | 1,035 | Greene County |
| Kettering Health Washington Twp | OH5750627 | NTNCWS | Dayton | 596 | Montgomery County |
| Kettlersville Well Association Pws | OH7500612 | CWS | Botkins | 200 | Shelby County |
| Kiddie Kingdom | OH2941912 | NTNCWS | Xenia | 37 | Greene County |
| Kidron Town And Country Store | OH8540512 | NTNCWS | Kidron | 330 | Wayne County |
| Kidron, Inc. Well 1 | OH8539912 | NTNCWS | Montgomery | 25 | Wayne County |
| Kidron, Inc. Well 2 | OH8540012 | NTNCWS | Montgomery | 32 | Wayne County |
| Kidron, Inc. Well 3 | OH8540112 | NTNCWS | Montgomery | 45 | Wayne County |
| Kids Ahead Learning Center-West | OH7725212 | NTNCWS | Mogadore | 141 | Summit County |
| Kids Country Day School | OH7675912 | NTNCWS | Hartville | 163 | Stark County |
| Killbuck Village Pws | OH3800712 | CWS | Killbuck | 950 | Holmes County |
| Kimberly Estates | OH2803312 | CWS | Newbury | 235 | Geauga County |
| Kinetico Incorporated | OH2851712 | NTNCWS | Newbury Township | 242 | Geauga County |
| Kingston Village Pws | OH7100912 | CWS | Kingston | 1,032 | Ross County |
| Kingsway Christian School Pws | OH8560212 | NTNCWS | Orrville | 270 | Wayne County |
| Kirby | OH2876948 | NTNCWS | Windsor | 214 | Geauga County |
| Kleen Test Products Pws | OH7951714 | NTNCWS | Strasburg | 52 | Tuscarawas County |
| Knapheide Truck Equipment | OH1237912 | NTNCWS | New Carlisle | 44 | Clark County |
| Knox Elementary West Branch Pws | OH1565212 | NTNCWS | Beloit | 116 | Columbiana County |
| Korda Manufacturing Inc | OH8546112 | NTNCWS | Conneaut | 47 | Wayne County |
| Lafferty Leisure Village | OH8701112 | CWS | Perrysburg | 40 | Wood County |
| Lagrange Village Pws | OH4700603 | CWS | Lagrange | 2,400 | Lorain County |
| Lake Avenue Terrace | OH7607412 | CWS | Berlin | 50 | Stark County |
| Lake Center Christian School | OH7653912 | NTNCWS | Hartville | 775 | Stark County |
| Lake County Pinecrest Subdistrict | OH4303103 | CWS | Painesville | 298 | Lake County |
| Lake Lucerne Club Co. | OH2801512 | CWS | Chagrin Falls | 980 | Geauga County |
| Lake Sherman Village Pws | OH7602712 | CWS | Navarre | 563 | Stark County |
| Lake View Village Mhp | OH7501312 | CWS | Minster | 56 | Shelby County |
| Lakemore Village Pws | OH7701812 | CWS | Lakemore | 3,068 | Summit County |
| Lakengren Water Authority | OH6800712 | CWS | Eaton | 2,950 | Preble County |
| Lakeshore Court Mobile Home | OH4500212 | CWS | Durham | 65 | Licking County |
| Lakeside Estates Mobile Home Park | OH0600312 | CWS | Lima | 45 | Auglaize County |
| Lakeside Mhc | OH4505512 | CWS | Durham | 465 | Licking County |
| Lakeview Estates Mhp | OH5900512 | CWS | Mansfield | 229 | Morrow County |
| Lakeview Village Pws | OH4601512 | CWS | Lakeview | 1,083 | Logan County |
| Lakeville Elementary School | OH3833912 | NTNCWS | Millersburg | 137 | Holmes County |
| Lakota Pre K-12 School | OH7259312 | NTNCWS | Kansas 44841 | 1,262 | Sandusky County |
| Lannings Foods | OH4243912 | NTNCWS | Mount Vernon | 215 | Knox County |
| Last Arrow Manufacturing | OH8557112 | NTNCWS | Orrville | 30 | Wayne County |
| Laura Village Pws | OH5500612 | CWS | Laura | 487 | Miami County |
| Laurel Springs Water Co. | OH2804112 | CWS | Middleburg Heights | 339 | Geauga County |
| Laurelville, Vlg Of | OH3700512 | CWS | Kingston | 586 | Hocking County, Pickaway County, Ross County |
| Lc Maries | OH7773012 | NTNCWS | New Franklin | 135 | Summit County |
| Leaders Mhp Pws | OH2801612 | CWS | Chesterland | 700 | Geauga County |
| Leesburg Village | OH3600712 | CWS | Leesburg | 1,315 | Highland County |
| Leesville Land Llc | OH3439212 | NTNCWS | Hopedale | 99 | Harrison County |
| Leetonia Village Pws | OH1501412 | CWS | New Waterford | 1,833 | Columbiana County |
| Legacy Christian School | OH7948612 | NTNCWS | Sugarcreek | 65 | Tuscarawas County |
| Lehman'S Hardware / Hrm Enterprises | OH8560612 | NTNCWS | Kidron | 910 | Wayne County |
| Leipsic Village | OH6900612 | CWS | Leipsic | 2,348 | Putnam County |
| Leonard Park Pws | OH2570717 | CWS | Columbus | 266 | Franklin County |
| Lewisburg South | OH6835412 | NTNCWS | Lewisburg | 100 | Preble County |
| Lewisburg Village Pws | OH6800812 | CWS | Lewisburg | 1,800 | Preble County |
| Lexington Elementary School | OH7637812 | NTNCWS | Alliance | 458 | Stark County |
| Lexview Allotment | OH7002312 | CWS | Mansfield | 225 | Richland County |
| Liberty Center Village | OH3500603 | CWS | Liberty Center | 1,350 | Henry County |
| Licking County Harbor Hills Pws | OH4500812 | CWS | Buckeye Lake | 3,415 | Licking County |
| Licking County Prescott Estates | OH4501712 | CWS | Buckeye Lake | 732 | Licking County |
| Licking Rural Electric | OH4534612 | NTNCWS | Utica | 36 | Licking County |
| Licking Valley Elementary School Pws | OH4564812 | NTNCWS | Newark | 1,400 | Licking County |
| Licking Valley High School Pws | OH4562012 | NTNCWS | Newark | 650 | Licking County |
| Lifesteps Childcare Llc | OH2563912 | NTNCWS | Grove City | 269 | Franklin County |
| Lincoln Square Apartments | OH7606612 | CWS | Kent | 125 | Stark County |
| Lincoln Terrace Estates | OH8501612 | CWS | Dalton | 222 | Wayne County |
| Lincolnview K-12 School | OH8137212 | NTNCWS | Van Wert | 882 | Van Wert County |
| Lindsey Elementary School | OH2837412 | NTNCWS | Chesterland | 450 | Geauga County |
| Lindsey Village Pws | OH7200512 | CWS | Lindsey | 446 | Sandusky County |
| Lisbon Village | OH1501512 | CWS | Warren | 2,821 | Columbiana County |
| Lithopolis Village Pws | OH2301112 | CWS | Lithopolis | 1,573 | Fairfield County |
| Little Chippewa Estates | OH8501712 | CWS | Morgantown | 153 | Wayne County |
| Little Strength Christian | OH1136412 | NTNCWS | Westville | 428 | Champaign County |
| Little Village Day Care Pws | OH4565912 | NTNCWS | Granville | 150 | Licking County |
| Little Walnut Water Treatment Facility | OH2303212 | CWS | Lancaster | 1,428 | Fairfield County |
| Living Hope Conservative Mennonite Pws | OH4244112 | NTNCWS | Butler | 128 | Knox County |
| Lmt Hartville | OH7655312 | NTNCWS | Hartville | 130 | Stark County |
| Lockbourne Village Pws | OH2503903 | CWS | Lockbourne | 275 | Franklin County |
| Lodi Village Pws | OH5200412 | CWS | Lodi | 2,884 | Medina County |
| Loudonville Village | OH0301012 | CWS | Loudonville | 2,641 | Ashland County, Holmes County |
| Louisville Center For Rehabilitation | OH7603312 | CWS | Louisville | 172 | Stark County |
| Louisville Gardens Health Center | OH7608012 | CWS | Louisville | 81 | Stark County |
| Love'S Truckstop | OH6789722 | NTNCWS | Valparaiso | 425 | Portage County |
| Lowell Village Pws | OH8400312 | CWS | Lowell | 603 | Washington County |
| Lucas Village | OH7002612 | CWS | Lucas | 620 | Richland County |
| Luxium Solutions Llc | OH2875412 | NTNCWS | Hiram | 130 | Geauga County |
| Lynchburg Village Pws | OH3600915 | CWS | Lynchburg | 1,515 | Highland County |
| Lyons Village | OH2600603 | CWS | Lyons | 562 | Fulton County |
| M & H Mhp, Llc | OH5900412 | CWS | Brooklyn | 55 | Morrow County |
| M And C Mobile Home Park | OH5000912 | CWS | Newton Falls | 58 | Mahoning County, Summit County |
| Madison County Engineers Office Pws | OH4946012 | NTNCWS | London | 45 | Madison County |
| Madison Plains Elementary School | OH4934312 | NTNCWS | London | 721 | Madison County |
| Madison Plains High School | OH4934212 | NTNCWS | London | 593 | Madison County |
| Madison South Elementary | OH7043112 | NTNCWS | Mansfield | 675 | Richland County |
| Madison Water District | OH7006712 | CWS | Mansfield | 2,050 | Richland County |
| Magni-Power Company | OH8541312 | NTNCWS | Wooster | 80 | Wayne County |
| Magnolia Village Pws | OH7603112 | CWS | Magnolia | 1,085 | Carroll County, Stark County |
| Mahle Engine Components | OH5836612 | NTNCWS | Mcconnelsville | 60 | Morgan County |
| Mahoning Valley Sanitary District | OH7801811 | NTNCWS | Youngstown | 55 | Trumbull County |
| Malinta Village | OH3501403 | CWS | Malinta | 265 | Henry County |
| Malta Industrial Park, Ltd | OH5833712 | NTNCWS | Waterford | 120 | Morgan County |
| Malta Village Pws | OH5800412 | CWS | Malta | 671 | Morgan County |
| Manchester Farms Water | OH2801712 | CWS | Chesterland | 82 | Geauga County |
| Manchester High School | OH7799961 | NTNCWS | New Franklin | 566 | Summit County |
| Manchester Middle School | OH7762512 | NTNCWS | New Franklin | 515 | Summit County |
| Manchester Village | OH0100112 | CWS | Manchester | 2,043 | Adams County |
| Mangia Inc. | OH2868712 | NTNCWS | Newbury | 150 | Geauga County |
| Mantua Mobile Home Park | OH6704212 | CWS | Durham | 250 | Portage County |
| Manufactured Housing Enterprise | OH8636412 | NTNCWS | Bryan | 150 | Williams County |
| Maple Del Manor Llc | OH6702312 | CWS | Ravenna | 350 | Portage County |
| Maple Ridge Mhc, Limited | OH2801112 | CWS | Columbus | 130 | Geauga County |
| Maplewood Elementary K-6 | OH7848812 | NTNCWS | Cortland | 320 | Trumbull County |
| Maplewood High School | OH7839512 | NTNCWS | Cortland | 340 | Trumbull County |
| Marathon Petroleum Company-Canton Truck | OH7677624 | NTNCWS | Canton | 62 | Stark County |
| Marblehead Village | OH6202411 | CWS | Marblehead | 865 | Ottawa County |
| Marlboro Elementary School | OH7638412 | NTNCWS | Alliance | 242 | Stark County |
| Marlboro Mfg Inc | OH7638512 | NTNCWS | Alliance | 70 | Stark County |
| Marshallville Village Pws | OH8501912 | CWS | Marshallville | 756 | Wayne County |
| Martin Marietta-Woodville | OH7237412 | NTNCWS | Woodville | 200 | Sandusky County |
| Martins Mennonite Church | OH8541812 | NTNCWS | Orville | 50 | Wayne County |
| Martinsburg Village Pws | OH4202312 | CWS | Martinsburg | 240 | Knox County |
| Matamoras Village | OH8400512 | CWS | New Matamoras | 896 | Washington County |
| Maurers Mobile Home Park | OH8701412 | CWS | Bowling Green | 181 | Wood County |
| Mayfair Christian School Pws | OH7780112 | NTNCWS | Uniontown | 108 | Summit County |
| Mayfield Mobile Home Park | OH7702212 | CWS | Akron | 100 | Summit County |
| Mayfield Utd. Methodist Church & Daycare | OH2870912 | NTNCWS | Chesterland | 360 | Geauga County |
| Maywood Community Inc. | OH2801812 | CWS | Chesterland | 150 | Geauga County |
| Mcarthur, Village Of | OH8200212 | CWS | Mcarthur | 1,920 | Vinton County |
| Mccartney Mobile Estates Mhp 1 | OH5002812 | CWS | Las Vegas | 25 | Mahoning County |
| Mccartney Mobile Estates Mhp 2 | OH5002112 | CWS | Las Vegas | 31 | Mahoning County |
| Mccartyville Well Association Pws | OH7500812 | CWS | Anna | 184 | Shelby County |
| Mcconnelsville Village | OH5800512 | CWS | Mconnelsville | 1,780 | Morgan County |
| Mcdonalds Restaurant - Wooster | OH8553912 | NTNCWS | Uniontown | 1,042 | Wayne County |
| Mcguffey Village Pws | OH3300712 | CWS | Mcguffey | 710 | Hardin County |
| Meadow Creek Condo Assoc | OH6705512 | CWS | Kent | 122 | Portage County |
| Meadowood Water Association | OH7003112 | CWS | Mansfield | 140 | Richland County |
| Mechanicsburg Village Pws | OH1100712 | CWS | Mechanicsburg | 1,644 | Champaign County |
| Medina Co/Sharon-Wadsworth Pws | OH5202003 | CWS | Medina | 566 | Medina County |
| Medway Elementary School | OH1238312 | NTNCWS | New Carlisle | 78 | Clark County |
| Mendon Village | OH5400612 | CWS | Spencerville | 628 | Mercer County |
| Mercury Plastics Fabrication | OH2844822 | NTNCWS | Middlefield | 150 | Geauga County |
| Mercury Plastics Inc-Ext | OH2844812 | NTNCWS | Middlefield | 150 | Geauga County |
| Mercy St Rita Mc-Systems Abcdefg & K | OH0254919 | NTNCWS | Lima | 501 | Allen County |
| Mesopotamia Elementary School | OH7839912 | NTNCWS | North Bloomfield | 158 | Trumbull County |
| Metzenbaum Residence | OH2803812 | NTNCWS | Chesterland | 28 | Geauga County |
| Metzenbaum School | OH2844912 | NTNCWS | Chesterland | 57 | Geauga County |
| Metzenbaum Sheltered Industries, Inc | OH2854112 | NTNCWS | Chardon | 30 | Geauga County |
| Metzenbaum Transportation Garage Pws | OH2876312 | NTNCWS | Chesterland | 36 | Geauga County |
| Miami Co-Deer Cliff Run Pws | OH5502203 | CWS | Troy | 526 | Miami County |
| Miami Co-N25A Extension | OH5502303 | CWS | Troy | 2,367 | Miami County |
| Miami East Schools Pws | OH5544812 | NTNCWS | Casstown | 1,430 | Miami County |
| Miami Valley Hospital Main Pws | OH5750613 | NTNCWS | Dayton | 404 | Montgomery County |
| Miba Bearings Us Llc | OH5831112 | NTNCWS | Mcconnelsville | 570 | Morgan County |
| Mid-Ohio Wsd - High Free Pike Wtp | OH4900012 | CWS | Columbus | 45 | Madison County |
| Mid-States Packaging Inc | OH4638912 | NTNCWS | Lewistown | 69 | Logan County |
| Middle Point Village Pws | OH8100312 | CWS | Middle Point | 576 | Van Wert County |
| Middlefield Mobile Home Park | OH2801912 | CWS | Middlefield | 400 | Geauga County |
| Middlefield Plastic Corp | OH2845012 | NTNCWS | Middlefield | 35 | Geauga County |
| Middlefield Village Pws | OH2802012 | CWS | Middlefield | 2,748 | Geauga County |
| Middleport Village Pws | OH5300112 | CWS | Middleport | 2,446 | Meigs County |
| Midwest Electric Inc | OH0637012 | NTNCWS | Saint Marys | 35 | Auglaize County |
| Midwest Express 2A 2B Back Pws | OH4643012 | NTNCWS | East Liberty | 50 | Logan County |
| Midwest Express 2A Front Pws | OH4643112 | NTNCWS | East Liberty | 50 | Logan County |
| Midwest Express 2B Front Pws | OH4643612 | NTNCWS | East Liberty | 50 | Logan County |
| Midwest Express 2Cde Pws | OH4644212 | NTNCWS | East Liberty | 180 | Logan County, Union County |
| Midwest Express 2F Pws | OH4648112 | NTNCWS | East Liberty | 110 | Logan County |
| Midwest Express 2G Pws | OH4652512 | NTNCWS | East Liberty | 80 | Logan County |
| Midwest Express 2H Pws | OH4652612 | NTNCWS | East Liberty | 35 | Logan County |
| Midwest Express 2I Pws | OH4652625 | NTNCWS | East Liberty | 150 | Logan County |
| Midwest Regional Education Service Ctr | OH7541812 | NTNCWS | Sidney | 40 | Shelby County |
| Mifflin Elementary School | OH7033412 | NTNCWS | Mansfield | 352 | Richland County |
| Milan Village Pws | OH2201212 | CWS | Milan | 1,371 | Erie County, Huron County |
| Milford Center Village Pws | OH8000212 | CWS | Milford Center | 792 | Union County |
| Millborne Mobile Home Community | OH8502212 | CWS | Dallas, Tx 75313 | 150 | Wayne County |
| Miller Weld Master Pws | OH7675112 | NTNCWS | Navarre | 70 | Stark County |
| Millers Acres Home Owner Association | OH1601012 | CWS | West Lafayette | 100 | Coshocton County |
| Millersport Village Pws | OH2301212 | CWS | Millersport | 3,200 | Fairfield County |
| Mingo Junction Pws | OH4101612 | CWS | Mingo Junction | 3,350 | Jefferson County |
| Minnich Manufacturing | OH0346118 | NTNCWS | Mansfield | 39 | Ashland County |
| Minster Village | OH0600412 | CWS | Minster | 3,025 | Auglaize County |
| Mission Conversion Services Alliance Llc | OH6632414 | NTNCWS | Piketon | 2,500 | Pike County |
| Mississinawa Valley High | OH1935712 | NTNCWS | Greenville | 781 | Darke County |
| Mohawk K-12 School | OH8834012 | NTNCWS | Sycamore | 1,044 | Wyandot County |
| Mohican Young Star Academy | OH0301112 | CWS | Perrysville | 150 | Ashland County |
| Molson Coors Usa Llc | OH0937812 | NTNCWS | Trenton | 550 | Butler County |
| Monroe Elementary School | OH4940512 | NTNCWS | Plain City | 287 | Madison County |
| Monroeville Village | OH3900811 | CWS | Monroeville | 1,400 | Huron County |
| Monterey Care Center | OH2570736 | CWS | Grove City | 130 | Franklin County |
| Morgan Meigsville - Sr 376 Pws | OH5801203 | CWS | Mcconnelsville | 68 | Morgan County |
| Morgan Meigsville - West Malta Pws | OH5801103 | CWS | Mcconnelsville | 520 | Morgan County |
| Morgan Meigsville Rural | OH5801003 | CWS | Mcconnelsville | 700 | Morgan County |
| Morristown Public Water System | OH0701303 | CWS | Morristown | 315 | Belmont County |
| Morrow Village Pws | OH8300912 | CWS | Morrow | 3,360 | Warren County |
| Mount Carmel Grove City | OH2570730 | NTNCWS | Grove City | 1,000 | Franklin County |
| Mount Eaton Village Pws | OH8502312 | CWS | Winesburg | 425 | Wayne County |
| Mount Pleasant Pws | OH4101712 | CWS | Mt Pleasant | 450 | Jefferson County |
| Mount St. John | OH2900112 | NTNCWS | Beavercreek | 115 | Greene County |
| Mount Sterling Village Pws | OH4900812 | CWS | Mount Sterling | 2,059 | Madison County |
| Mountainview Mobile Village | OH4602012 | CWS | Corsicana | 300 | Logan County |
| Mpw Corporate Bldg Pws | OH4564512 | NTNCWS | Hebron | 46 | Licking County |
| Mpw Industrial Services | OH4555112 | NTNCWS | Hebron | 79 | Licking County |
| Mpw Technology Center | OH4567620 | NTNCWS | Hebron | 118 | Licking County |
| Mt Blanchard Village | OH3200512 | CWS | Mt Blanchard | 488 | Hancock County |
| Mt Victory Village Pws | OH3300912 | CWS | Mt Victory | 603 | Hardin County |
| Multi-Wing America, Inc. | OH2863412 | NTNCWS | Burton | 60 | Geauga County |
| Munson Elementary School | OH2850812 | NTNCWS | Chardon | 360 | Geauga County |
| Murray City Village Pws | OH3700803 | CWS | Murray City | 449 | Hocking County |
| Mvp Plastics Pws | OH2863012 | NTNCWS | Middlefield | 38 | Geauga County |
| Nashville Village Pws | OH3801012 | CWS | Big Prairie | 197 | Holmes County |
| National Trail Local Schools | OH6831112 | NTNCWS | New Paris | 1,100 | Preble County |
| Navarre Village Pws | OH7604112 | CWS | Navarre | 1,957 | Stark County |
| Nelson Ledges Estates Mhp | OH6702412 | CWS | Garrettsville | 231 | Geauga County, Portage County |
| Nevada Village Pws | OH8800312 | CWS | Nevada | 814 | Wyandot County |
| New Adventures Early Learning Center | OH6782112 | NTNCWS | Mantua | 86 | Portage County |
| New Athens Pws | OH3401103 | CWS | New Athens | 367 | Harrison County |
| New Concord Pws | OH6001711 | CWS | New Concord | 2,491 | Muskingum County |
| New Destiny Treatment Center | OH8552512 | NTNCWS | Clinton | 68 | Wayne County |
| New Dover Estates | OH8000012 | CWS | Colorado Springs | 100 | Union County |
| New Holland Village Pws | OH6501612 | CWS | New Holland | 830 | Pickaway County |
| New Knoxville Village | OH0601012 | CWS | New Knoxville | 946 | Auglaize County |
| New London Village Pws | OH3902611 | CWS | New London | 3,226 | Huron County |
| New Madison Village Pws | OH1900912 | CWS | New Paris | 892 | Darke County |
| New Paris Village Pws | OH6800912 | CWS | New Paris | 1,681 | Preble County |
| New Richmond Village Pws | OH1301212 | CWS | New Richmond | 2,698 | Clermont County |
| New Riegel Local School | OH7437512 | NTNCWS | New Riegel | 524 | Seneca County |
| New Straitsville, Village Of | OH6400503 | CWS | New Straitsville | 652 | Perry County |
| New Vienna Village | OH1400815 | CWS | New Vienna | 1,240 | Clinton County, Highland County |
| New Waterford Village Pws | OH1501722 | CWS | New Waterford | 1,238 | Columbiana County |
| Newbury Business Park | OH2853312 | NTNCWS | Willoughby Hills | 225 | Geauga County |
| Newbury Shopping Center Pws | OH2874912 | NTNCWS | Mayfield Village | 449 | Geauga County |
| Newpointe Community Church Pws | OH7949612 | NTNCWS | Dover | 2,640 | Tuscarawas County |
| Newport Water/Sewer District Pws | OH8400612 | CWS | Newport | 1,582 | Washington County |
| Ney Village | OH2000512 | CWS | Ney | 854 | Defiance County |
| Nk Parts Industries Inc Pws | OH4651412 | NTNCWS | Sidney | 55 | Logan County |
| Nk Parts Industries R & D Pws | OH4652618 | NTNCWS | Sidney | 25 | Logan County |
| Noble County Water Authority Pws | OH6100503 | CWS | Belle Valley | 2,368 | Noble County |
| Noble Water Company | OH6100203 | CWS | Belle Valley | 815 | Noble County |
| North Fairfield Village | OH3901012 | CWS | North Fairfield | 534 | Huron County |
| North Hampton Village Pws | OH1203412 | CWS | North Hampton | 538 | Clark County |
| North Lewisburg Village Pws | OH1100812 | CWS | North Lewisburg | 1,850 | Champaign County |
| North Nimishillen Elementary | OH7639412 | NTNCWS | Louisville | 446 | Stark County |
| North Pine Estates | OH8600812 | CWS | Lorain | 50 | Williams County |
| North Point Education Service Ctr Ottawa | OH6233812 | NTNCWS | Graytown | 60 | Ottawa County |
| Northeast Water System | OH2637812 | CWS | Wauseon | 1,250 | Fulton County |
| Northeastern Athletic Complex | OH1233412 | NTNCWS | Springfield | 423 | Clark County |
| Northern Ohio Rural Water - Camp Road | OH3946916 | CWS | Norwalk | 758 | Huron County |
| Northern Ohio Rural Water - Se District | OH3946612 | CWS | Norwalk | 586 | Huron County |
| Northern Perry Co.Water #1 | OH6400912 | CWS | New Lexington | 1,706 | Perry County |
| Northland Senior Community | OH8601112 | CWS | Springville | 50 | Williams County |
| Northmor Administrative Office | OH5936212 | NTNCWS | Galion | 30 | Morrow County |
| Northmor School Pws | OH5942712 | NTNCWS | Galion | 1,180 | Morrow County |
| Northridge Local School Campus | OH4535512 | NTNCWS | Johnstown | 1,600 | Licking County |
| Northtowne Communities Llc | OH1901012 | CWS | Versailles | 100 | Darke County |
| Northview Utility Corporation Pws | OH7500912 | CWS | Liberty Township | 87 | Mercer County, Shelby County |
| Northwest Water District Pws | OH8641912 | NTNCWS | Montpelier | 1,100 | Williams County |
| Northwestern Local Schools Pws | OH8561712 | NTNCWS | West Salem | 1,540 | Wayne County |
| Northwestern W And Sd - Co Rd P Pws | OH3539212 | CWS | Bowling Green | 440 | Henry County |
| Northwestern W And Sd - Fostoria North | OH8752712 | NTNCWS | Bowling Green | 129 | Wood County |
| Northwestern W And Sd - Mccomb | OH3200411 | CWS | Bowling Green | 1,527 | Hancock County |
| Northwestern W And Sd - Middleton Twp | OH8752212 | CWS | Bowling Green | 3,615 | Wood County |
| Northwestern W And Sd - Sr 108 Pws | OH3539214 | CWS | Bowling Green | 267 | Henry County |
| Northwestern W And Sd - Weston | OH8703211 | CWS | Bowling Green | 3,648 | Wood County |
| Northwoods Mhc | OH5501912 | CWS | Mansfield | 70 | Miami County |
| Notre Dame Sisters And Elementary School | OH2802412 | CWS | Chardon | 950 | Geauga County |
| Notre Dame-Cathedral Latin School | OH2841012 | NTNCWS | Chardon | 810 | Geauga County |
| Nx Automotive Building 4 | OH4652635 | NTNCWS | East Liberty | 70 | Logan County |
| Nx Automotive Logistics Bldg 1 North Pws | OH4644112 | NTNCWS | East Liberty | 95 | Logan County |
| Nx Automotive Logistics Bldg 1 South Pws | OH4644122 | NTNCWS | East Liberty | 65 | Logan County |
| Nx Automotive Logistics Bldg 2 Pws | OH4646412 | NTNCWS | East Liberty | 65 | Logan County |
| Nx Automotive Logistics Bldg 3 Pws | OH4652617 | NTNCWS | East Liberty | 25 | Logan County |
| Oak Grove Mennonite Church And Preschool | OH8544212 | NTNCWS | Smithville | 232 | Wayne County |
| Oak Haven Residential Care | OH6901012 | CWS | Cloverdale | 46 | Putnam County |
| Oak Hill, Village Of | OH4000411 | CWS | Oak Hill | 3,067 | Jackson County |
| Oak Hills Mobile Home Park | OH2502112 | CWS | Durham | 505 | Franklin County |
| Oak Knoll Estates | OH7703212 | CWS | North Canton | 68 | Summit County |
| Oak Park Estates Llc | OH8502512 | CWS | Doylestown | 300 | Wayne County |
| Oakwood Crossing Mhp | OH7003812 | CWS | Akron | 200 | Richland County |
| Oakwood Mhp | OH8601212 | CWS | Lorain | 180 | Williams County |
| Oakwood Village Mhp | OH5703715 | CWS | Southfield | 1,500 | Montgomery County |
| Oakwood Village Pws | OH6300312 | CWS | Oakwood | 727 | Paulding County |
| Oasis Surgery Center | OH7677636 | NTNCWS | North Canton | 75 | Stark County |
| Obetz Satellite 1 Pws | OH2504303 | CWS | Obetz | 151 | Franklin County |
| Obetz Satellite 2 Pws | OH2554603 | CWS | Obetz | 1,267 | Franklin County |
| Obetz Satellite 3 Pws | OH2554703 | NTNCWS | Obetz | 200 | Franklin County |
| Obetz Satellite 4 Pws | OH2554803 | NTNCWS | Obetz | 175 | Franklin County |
| Obetz Satellite 6 Pws | OH2566512 | CWS | Obetz | 1,317 | Franklin County |
| Obetz Village Pws | OH2502212 | CWS | Obetz | 3,167 | Franklin County |
| Odnr-Deer Creek State Park/Lodge Pws | OH6536712 | NTNCWS | Conover | 275 | Pickaway County |
| Odnr-Hocking Hills State Park | OH3736411 | NTNCWS | Columbus | 2,559 | Hocking County |
| Odnr-Punderson | OH2847212 | NTNCWS | Columbus | 475 | Geauga County |
| Odrc-Southeastern Correctional Institute | OH2301412 | CWS | Lancaster | 1,461 | Fairfield County |
| Ohio And Lee Twp Water Authority | OH5600412 | CWS | Sardis | 1,620 | Monroe County |
| Ohio City Village Pws | OH8100412 | CWS | Ohio City | 705 | Van Wert County |
| Ohio Drill And Tool Co. | OH1532412 | NTNCWS | Homeworth | 41 | Columbiana County |
| Ohio Edison Kent | OH7785312 | NTNCWS | Greensburg | 30 | Summit County |
| Ohio Farms Packing Co. Pws | OH8562212 | NTNCWS | Creston | 175 | Wayne County |
| Ohio Living Dorothy Love Pws | OH7500712 | CWS | Sidney | 471 | Shelby County |
| Ohio Valley Midstream Llc | OH1566512 | NTNCWS | Kensington | 30 | Columbiana County |
| Old Fort High School | OH7445212 | NTNCWS | Tiffin | 315 | Seneca County |
| Old Souls Farm | OH1137117 | NTNCWS | Saint Paris | 225 | Champaign County |
| Old Straitsville Water Association | OH6401403 | CWS | Logan | 2,950 | Hocking County, Perry County |
| Old Straitsville-Rockbridge | OH3740512 | CWS | Logan | 361 | Hocking County |
| One School Global Ashland | OH0346116 | NTNCWS | Blacklick | 70 | Ashland County |
| Orchard Estates I Mhc, Llc | OH6702512 | CWS | Ravenna | 316 | Portage County |
| Orwell Village Pws | OH0401012 | CWS | Orwell | 1,660 | Ashtabula County |
| Osgood State Bank | OH1938712 | NTNCWS | Osgood | 65 | Darke County |
| Otc-Kunkle Maintenance Building | OH8640112 | NTNCWS | Berea | 27 | Williams County |
| Otterbein-Lebanon Retreat Center | OH8301112 | CWS | Lebanon | 1,541 | Warren County |
| Ottoville Village Pws | OH6900812 | CWS | Ottoville | 976 | Putnam County |
| Pandora Village Pws | OH6900912 | CWS | Pandora | 1,204 | Putnam County |
| Papillion Enrichment Center Ii Pws | OH2835512 | NTNCWS | Chesterland | 25 | Geauga County |
| Park Terrace Mhp | OH1203712 | CWS | Tipp City | 100 | Clark County |
| Parker Trutec Industries | OH1134112 | NTNCWS | Urbana | 160 | Champaign County |
| Parker Trutec West Pws | OH1137113 | NTNCWS | Urbana | 60 | Champaign County |
| Paw Paw Lake | OH2802211 | CWS | Chagrin Falls | 120 | Geauga County |
| Pax Machine Works | OH5438212 | NTNCWS | Celina | 255 | Mercer County |
| Payne Village Pws | OH6300712 | CWS | Payne | 1,550 | Paulding County |
| Pcm Aria Marion Llc | OH5100212 | CWS | Seattle | 230 | Marion County |
| Pcpi Plastics Llc_East_Pws | OH4646112 | NTNCWS | Degraff | 30 | Logan County |
| Peaberry Plaza | OH5053612 | NTNCWS | Hermitage | 241 | Mahoning County |
| Pearl Valley Cheese, Inc | OH1638916 | NTNCWS | Fresno | 60 | Coshocton County |
| Pebble Creek Convalescent Center | OH7707412 | CWS | Akron | 240 | Summit County |
| Peebles Village | OH0100203 | CWS | Peebles | 1,978 | Adams County |
| Pemberville Village Pws | OH8701712 | CWS | Pemberville | 1,326 | Wood County |
| Peniel Fellowship Church/School | OH3842112 | NTNCWS | Shreve | 136 | Holmes County |
| Perrysburg Estates Mhp | OH8701912 | CWS | Perrysburg | 270 | Wood County |
| Perrysburg Industrial Park Pws | OH8749212 | NTNCWS | Troy | 30 | Wood County |
| Perrysville Village | OH0301212 | CWS | Perrysville | 735 | Ashland County |
| Peyton Community Well | OH7003712 | CWS | Mansfield | 149 | Richland County |
| Pheasant Run Association Pws | OH4701912 | CWS | Lagrange | 1,550 | Lorain County |
| Phillipsburg Village Pws | OH5702112 | CWS | Phillipsburg | 490 | Montgomery County |
| Philo | OH6001912 | CWS | Philo | 974 | Muskingum County |
| Picket Fences Mhp | OH4901512 | CWS | Lewis Center | 27 | Madison County |
| Pike Water, Inc.-Ross 2 Pws | OH6601803 | CWS | Waverly | 873 | Pike County |
| Pike Water, Inc.-Ross 3 Pws | OH6602303 | CWS | Waverly | 91 | Pike County |
| Piketon Village Pws | OH6600712 | CWS | Piketon | 2,181 | Pike County |
| Pilot Corporation - Eaton 286 | OH6835312 | NTNCWS | Knoxville | 955 | Preble County |
| Pine Mill Ridge 2 Pws | OH7707212 | CWS | Seville | 178 | Summit County |
| Pine Mill Ridge 2500 Pws | OH7707312 | CWS | Cuyahoga Falls | 120 | Summit County |
| Pine Mill Ridge 525 Pws | OH7707112 | CWS | Cuyahoga Falls | 40 | Summit County |
| Pine Ridge Mhp | OH4737516 | CWS | Orem | 570 | Lorain County |
| Pine Tree Barn, Inc. | OH8553612 | NTNCWS | Wooster | 175 | Wayne County |
| Pine View Christian School | OH8558412 | NTNCWS | Wooster | 46 | Wayne County |
| Pioneer Hi Bred International | OH8745412 | NTNCWS | Grand Rapids | 84 | Wood County |
| Pioneer Village | OH8601312 | CWS | Pioneer | 1,449 | Williams County |
| Pip, Llc Pws | OH2853612 | NTNCWS | Montville | 63 | Geauga County |
| Plainview Christian School | OH4939412 | NTNCWS | Plain City | 100 | Madison County |
| Plalan Lake Water Assoc. | OH7804512 | CWS | West Farmington | 305 | Trumbull County |
| Planet Earth Preschool, Inc Pws | OH6784012 | NTNCWS | Ravenna | 48 | Portage County |
| Pleasant Acres Mhp | OH2502912 | CWS | Durham | 217 | Franklin County |
| Pleasant Acres Mobile Home Community Llc | OH5100612 | CWS | Clinton Township | 158 | Marion County |
| Pleasant City, Village Of | OH3000912 | CWS | Pleasant City | 447 | Guernsey County, Noble County |
| Pleasant Hill Baptist Church & Preschool | OH8545712 | NTNCWS | Norton | 429 | Wayne County |
| Pleasant Hill Village Pws | OH5501312 | CWS | Pleasant Hill | 1,226 | Miami County |
| Pleasant Park Mobile Court | OH7802512 | CWS | Warren | 58 | Trumbull County |
| Pleasant Valley Church And School | OH7854312 | NTNCWS | Niles | 162 | Trumbull County |
| Pleasantville Village Pws | OH2301712 | CWS | Pleasantville | 960 | Fairfield County |
| Plumwood Mobile Home Park | OH4901212 | CWS | Williamsport | 48 | Madison County |
| Plymouth Village | OH7004003 | CWS | Plymouth | 1,874 | Huron County, Richland County |
| Pm Estates Pws | OH6700612 | CWS | Mogadore | 197 | Portage County |
| Pomeroy Village Pws | OH5300212 | CWS | Pomeroy | 1,800 | Meigs County |
| Ponderosa Estates Mhp | OH2503012 | CWS | Dublin | 216 | Franklin County |
| Ponderosa Estates Pws | OH3700312 | CWS | Logan | 35 | Hocking County |
| Port Washington Elem School New Pws | OH7950312 | NTNCWS | Port Washington | 425 | Tuscarawas County |
| Portage County Wr - Mantua Village Pws | OH6702212 | CWS | Ravenna | 1,207 | Portage County |
| Portage County Wr - Rivermoor | OH6705312 | CWS | Ravenna | 339 | Portage County |
| Portage Metro. Housing Authority | OH6780512 | NTNCWS | Ravenna | 48 | Portage County |
| Portersville East Branch Water Co. | OH6402303 | CWS | Malta | 2,340 | Morgan County, Perry County |
| Powhatan Point Public Water System | OH0701412 | CWS | Powhatan Point | 1,592 | Belmont County |
| Premier Park Estates Llc | OH1502612 | CWS | Minerva | 60 | Columbiana County |
| Prentke Romich Company | OH8560112 | NTNCWS | Wooster | 160 | Wayne County |
| Preserve Place | OH7602512 | CWS | Canal Fulton | 95 | Stark County |
| Pride Valley Mhp | OH1000512 | CWS | Malvern | 100 | Carroll County, Stark County |
| Primetals Technologies, Llc | OH7856314 | NTNCWS | Warren, | 60 | Trumbull County |
| Principle Business Enterprises | OH8741612 | NTNCWS | Dunbridge | 236 | Wood County |
| Procter N Gamble Dist Ctr - Lima | OH0254312 | NTNCWS | Lima | 360 | Allen County |
| Proctorville Village Pws | OH4400912 | CWS | Proctorville | 574 | Lawrence County |
| Progressive Foam Technologies Pws | OH7949712 | NTNCWS | Beach City | 87 | Tuscarawas County |
| Progressive Pines, Llc | OH8500912 | CWS | Wooster | 79 | Wayne County |
| Provia Door Pws | OH3850312 | NTNCWS | Sugarcreek | 575 | Holmes County |
| Provia Stone Llc Pws | OH3850813 | NTNCWS | Sugarcreek | 160 | Holmes County |
| Provimi North America, Inc. | OH6836412 | NTNCWS | Lewisburg | 115 | Preble County |
| Pulaski Head Start | OH8631912 | NTNCWS | Defiance | 150 | Williams County |
| Pure Water Corporation | OH6100303 | CWS | Caldwell | 1,989 | Noble County |
| Pure Water System 2 Pws | OH6100403 | CWS | Caldwell | 279 | Noble County |
| Put-In-Bay Village | OH6203311 | CWS | Put-In-Bay | 5,000 | Ottawa County |
| Quaker City | OH3001011 | CWS | Quaker City | 750 | Guernsey County |
| Quarry Lakes Mhp Llc | OH5702212 | CWS | Miamisburg | 141 | Montgomery County |
| Quikrete Companies | OH6781012 | NTNCWS | Ravenna | 50 | Portage County |
| Quincy Village Pws | OH4601912 | CWS | Quincy | 600 | Logan County |
| Racine Village Pws | OH5300312 | CWS | Racine | 675 | Meigs County |
| Ragersville Elementary School | OH7937912 | NTNCWS | Sugarcreek | 160 | Tuscarawas County |
| Rainbow Promise Childcare And Preschool | OH2035412 | NTNCWS | Defiance | 263 | Defiance County |
| Ranch Club Estates Water Association | OH6703012 | CWS | Ravenna | 234 | Portage County |
| Ranch Of Opportunity Pws | OH2400912 | CWS | Dayton | 55 | Fayette County |
| Ransom H Barr Elementary | OH7647212 | NTNCWS | Canton | 412 | Stark County |
| Rawson Village Pws | OH3200612 | CWS | Rawson | 571 | Hancock County |
| Rayco Manufacturing, Llc - Building 2 Pw | OH8560012 | NTNCWS | Wooster | 100 | Wayne County |
| Rayland Village Pws | OH4101803 | CWS | Rayland | 417 | Jefferson County |
| Raymond Elementary School | OH8033612 | NTNCWS | Marysville | 290 | Union County |
| Real Church Pws | OH2343312 | NTNCWS | Pickerington | 402 | Fairfield County |
| Reno Water And Sewer - Kardex | OH8402903 | CWS | Marietta | 446 | Washington County |
| Reno Water And Sewer 1 | OH8402503 | CWS | Marietta | 2,189 | Washington County |
| Reno Water And Sewer 2 | OH8402803 | CWS | Marietta | 1,520 | Washington County |
| Republic Village | OH7400812 | CWS | Republic | 550 | Seneca County |
| Rex Hill Estates, Llc | OH7703812 | CWS | Crofton | 246 | Summit County |
| Richfield United Ch Of Christ Preschool | OH7741512 | NTNCWS | Richfield | 110 | Summit County |
| Richwood Village Pws | OH8000412 | CWS | Richwood | 2,200 | Union County |
| Ridgedale Elementary School | OH5134412 | NTNCWS | Morral | 361 | Marion County |
| Ridgedale Jr/Sr High School | OH5140812 | NTNCWS | Morral | 465 | Marion County |
| Ridgeview Behavioral Hospital | OH8100712 | NTNCWS | Middle Point | 134 | Van Wert County |
| Rio Grande | OH2700316 | CWS | Rio Grande | 830 | Gallia County |
| Risen Christ Lutheran Church Pws | OH1245212 | NTNCWS | Springfield | 160 | Clark County |
| River Of Life Worship Center | OH8639512 | NTNCWS | Montpelier | 81 | Williams County |
| Riverdale Local Schools | OH3239812 | NTNCWS | Mount Blanchard | 1,106 | Hancock County |
| Roaming Shores Village Pws | OH0400611 | CWS | Roaming Shores | 1,764 | Ashtabula County |
| Roberts Trailer Park | OH6400812 | CWS | Durham | 50 | Licking County, Perry County |
| Robin Grays Pws | OH1330912 | CWS | New Richmond | 88 | Clermont County |
| Rock Creek Village | OH0401111 | CWS | Rock Creek | 667 | Ashtabula County |
| Rock Of Ages School And Church | OH8546512 | NTNCWS | Dalton | 247 | Wayne County |
| Rockford Village | OH5401112 | CWS | Rockford | 1,120 | Mercer County |
| Rockwood Park | OH1000612 | CWS | Sagamore Hills | 200 | Carroll County |
| Rohrer Corporation - Hayesville Pws | OH0338412 | NTNCWS | Wadsworth | 93 | Ashland County |
| Rolling Hills Mobile Home Park | OH1101012 | CWS | Dallas | 500 | Champaign County |
| Rolling Terrace Mhp | OH1203812 | CWS | Troy | 90 | Clark County |
| Rosedale Bible Institute | OH4902112 | CWS | Irwin | 175 | Madison County |
| Roseville Pws | OH6002112 | CWS | Roseville | 1,852 | Muskingum County, Perry County |
| Rothenbuhler Cheesemakers, Inc. | OH2835412 | NTNCWS | Middlefield | 160 | Geauga County |
| Rudolph - Libbe | OH8753216 | NTNCWS | Walbridge | 130 | Wood County |
| Rushsylvania Village Pws | OH4602112 | CWS | Rushsylvania | 551 | Logan County |
| Rushville Village Pws | OH2303103 | CWS | Rushville | 357 | Fairfield County |
| Russells Point Village Pws | OH4602212 | CWS | Russells Point | 1,651 | Logan County |
| Russia Village Pws | OH7541912 | CWS | Russia | 640 | Shelby County |
| Rustic Pines Mhc | OH2802112 | CWS | Thompson | 180 | Geauga County |
| Rustic Ridge Mhp | OH2302812 | CWS | Circleville | 450 | Fairfield County |
| S And K Products Company | OH5440312 | NTNCWS | Celina | 32 | Mercer County |
| Sabina Village Pws | OH1400912 | CWS | Sabina | 2,564 | Clinton County |
| Sacred Heart School | OH7037812 | NTNCWS | Shelby | 398 | Richland County |
| Saint Charles Center | OH5401212 | CWS | Celina | 142 | Mercer County |
| Saint Paris Village Pws | OH1100912 | CWS | Piqua | 2,089 | Champaign County |
| Saint Peregrine Chapel School Pws | OH7728112 | NTNCWS | Richfield | 47 | Summit County |
| Salem Amish Fellowship Church School Pws | OH1637412 | NTNCWS | Newcomerstown | 120 | Coshocton County |
| Salem Regional Medical Center | OH1566518 | NTNCWS | Salem | 1,310 | Columbiana County |
| Salt Fork Utility Co. | OH3053012 | NTNCWS | Kimbolton | 2,054 | Guernsey County |
| Sarchione Chevrolet | OH6765812 | NTNCWS | Randolph | 78 | Portage County |
| Sarchione Ford | OH6760212 | NTNCWS | Randolph | 63 | Portage County |
| Sardinia Village Pws | OH0801511 | CWS | Sardinia | 952 | Brown County, Highland County |
| Scenic Creek Apartments Pws | OH7676612 | CWS | Canton | 80 | Stark County |
| Scenic Hills Estates | OH3700912 | CWS | Logan | 32 | Hocking County |
| Scenic Ridge Church And Christian School | OH0346114 | NTNCWS | Loudonville | 286 | Ashland County |
| Schlabach Wood Design Pws | OH1638612 | NTNCWS | Baltic | 35 | Coshocton County |
| Schmidt Machine Company | OH8836112 | NTNCWS | Upper Sandusky | 74 | Wyandot County |
| Schoner Chevrolet Sales | OH7642212 | NTNCWS | Hartville | 55 | Stark County |
| Schrop Intermediate School | OH7768312 | NTNCWS | Atwater | 525 | Summit County |
| Sci Lakeridge Estates, Llc | OH4601312 | CWS | Clearwater | 40 | Logan County |
| Scio Pws | OH3401312 | CWS | Scio | 690 | Harrison County |
| Scioto Water Inc - Stony Run | OH7300803 | CWS | Franklin Furnace | 178 | Scioto County |
| Scioto Water Inc. - Gliem Rd Pws | OH7332513 | CWS | Franlin Furnace | 132 | Scioto County |
| Scioto Water Inc. - Pond Run | OH7301303 | CWS | Franklin Furnace | 845 | Scioto County |
| Scioto Water Inc. - Zeigler Lane | OH7301503 | CWS | Franklin Furnace | 76 | Scioto County |
| Scioto Water Inc.- Sheila Blvd | OH7302403 | CWS | Franklin Furnace | 34 | Scioto County |
| Scioto Water Inc.-Careys Run | OH7301703 | CWS | Franklin Furnace | 352 | Scioto County |
| Scioto Water Inc.-Hygean Run | OH7301903 | CWS | Franklin Furnace | 64 | Scioto County |
| Scioto Water Inc.-Nace'S Run | OH7302103 | CWS | Franklin Furnace | 59 | Scioto County |
| Scioto Water Inc.-Oakwood | OH7302203 | CWS | Franklin Furnace | 36 | Scioto County |
| Scioto Water Inc.-Slab Run | OH7301603 | CWS | Franklin Furnace | 115 | Scioto County |
| Scioto Water Inc.-Sr125 | OH7301203 | CWS | Franklin Furnace | 537 | Scioto County |
| Scioto Water, Inc.-Davis Camp | OH7302503 | CWS | Franklin Furnace | 134 | Scioto County |
| Scot Industries Inc | OH8559012 | NTNCWS | Wooster | 75 | Wayne County |
| Scott Process Systems Inc Plant 1 Pws | OH7676912 | NTNCWS | Hartville | 57 | Stark County |
| Seaman Village Pws | OH0100303 | CWS | Seaman | 944 | Adams County |
| Seasons Rehab And Care Center | OH7704812 | CWS | Stow | 79 | Summit County |
| Select Sires Inc | OH8036612 | NTNCWS | Plain City | 105 | Union County |
| Seven Mile Village Pws | OH0902612 | CWS | Seven Mile | 1,000 | Butler County |
| Seville Village Pws | OH5201412 | CWS | Seville | 2,296 | Medina County |
| Shady Knoll Mhp | OH7605012 | CWS | North Canton | 76 | Stark County |
| Shalom United Methodist Church Pws | OH2348012 | NTNCWS | Baltimore | 50 | Fairfield County |
| Shawnee High School | OH1243312 | NTNCWS | Springfield | 950 | Clark County |
| Shawnee, Village Of | OH6401003 | CWS | Shawnee | 605 | Perry County |
| Shekinah Christian School Pws | OH4944112 | NTNCWS | Plain City | 240 | Madison County |
| Shelby County Water And Sewer Pws | OH7500112 | CWS | Minster | 375 | Shelby County |
| Shelby Welded Tube | OH7084815 | NTNCWS | Shelby | 82 | Richland County |
| Shelly Acres Water Association | OH7004612 | CWS | Mansfield | 454 | Richland County |
| Sheoga Hardwood Flooring Pws | OH2876912 | NTNCWS | Middlefield | 75 | Geauga County |
| Sherwood Forest Mhp Pws | OH1901112 | CWS | West Covina | 578 | Darke County |
| Sherwood Grove Mhp | OH5700512 | CWS | Brookville | 30 | Montgomery County |
| Sherwood Village | OH2000712 | CWS | Sherwood | 811 | Defiance County |
| Shiloh Village | OH7004712 | CWS | Shiloh | 601 | Richland County |
| Sho | OH3850820 | NTNCWS | Canton | 55 | Holmes County |
| Shorewood Village Subdivision | OH7201012 | CWS | Fremont | 359 | Sandusky County |
| Shreve Village Pws | OH8503412 | CWS | Shreve | 1,514 | Wayne County |
| Silver Lake Village Pws | OH7704303 | CWS | Silver Lake | 2,519 | Summit County |
| Skyland Hills Mhp | OH7605412 | CWS | Minerva | 273 | Stark County |
| Small Wonders Learning Center Pws | OH2340812 | NTNCWS | Canal Winchester | 112 | Fairfield County |
| Smithville Village Pws | OH8503512 | CWS | Lakeville | 1,232 | Wayne County |
| Smithville Western Limited | OH8503712 | CWS | Wooster | 480 | Wayne County |
| Somerset Village Of | OH6401111 | CWS | Somerset | 1,490 | Perry County |
| South Amherst Village Pws | OH4701411 | CWS | South Amherst | 1,688 | Lorain County |
| South Bloomfield Village Pws | OH6502112 | CWS | South Bloomfield | 1,999 | Pickaway County |
| South Charleston Village Pws | OH1204212 | CWS | Lebanon | 1,660 | Clark County |
| South Lebanon Pws No 2 | OH8361413 | CWS | South Lebanon | 180 | Warren County |
| South Main Centre Ltd | OH7784412 | NTNCWS | Bloomfield Hills | 1,347 | Summit County |
| South Range Local Schools K-12 Pws | OH5054712 | NTNCWS | Salem | 1,524 | Mahoning County |
| South Solon Village Pws | OH4901312 | CWS | South Solon | 395 | Madison County |
| South Vienna Village Pws | OH1204312 | CWS | South Vienna | 393 | Clark County |
| South Zanesville Pws | OH6002212 | CWS | Zanesville | 2,800 | Muskingum County |
| Southeast Elementary School Pws | OH6753612 | NTNCWS | Ravenna | 790 | Portage County |
| Southeast High School | OH6753512 | NTNCWS | Ravenna | 400 | Portage County |
| Southeast Middle School Pws | OH6784912 | NTNCWS | Ravenna | 380 | Portage County |
| Southern Estates Water Assoc Pws | OH7004812 | CWS | Mansfield | 150 | Richland County |
| Southern Perry Co-Buckingham | OH6401503 | CWS | Crooksville | 59 | Perry County |
| Southern Perry Co-Hemlock | OH6401803 | CWS | Crooksville | 305 | Perry County |
| Southern Perry Co-Irish Ridge | OH6434912 | CWS | Crooksville | 98 | Athens County, Perry County |
| Southern Perry Co-Mainesville | OH6434914 | CWS | Crooksville | 175 | Perry County |
| Southern Perry Co-Millertown | OH6401903 | CWS | Crooksville | 146 | Perry County |
| Southside Investments, Inc. | OH8540212 | NTNCWS | Apple Creek | 43 | Wayne County |
| Spencer, Village Of | OH5201611 | CWS | Spencer | 800 | Medina County |
| Spencerville Village | OH0201312 | CWS | Spencerville | 2,261 | Allen County |
| Spring Garden Waldorf School | OH7795612 | NTNCWS | Copley | 201 | Summit County |
| Spring Hill Elementary School | OH7742912 | NTNCWS | Atwater | 495 | Summit County |
| Spring Lakes Mobile Home Park | OH6703912 | CWS | Kent | 185 | Portage County |
| Spring Meadows Care Center | OH1100312 | CWS | Woodstock | 42 | Champaign County |
| Spring Valley Estates Mhp | OH2902512 | CWS | Maumee | 360 | Greene County |
| Spring Valley Mhp | OH4901412 | CWS | South Solon | 96 | Madison County |
| Spring Valley Mobile Home Park | OH1700612 | CWS | Galion | 160 | Crawford County |
| Spring Valley Village | OH2902422 | CWS | Spring Valley | 538 | Greene County |
| Springfield House Mimis House Of Littles | OH1253212 | NTNCWS | Springfield | 185 | Clark County |
| Springwater Gardens Condominiums Pws | OH7677628 | CWS | North Canton | 41 | Stark County |
| Springwood Lake Camp Club | OH7651212 | NTNCWS | East Sparta | 210 | Stark County |
| Spruce Tree Village Mhp | OH8503812 | CWS | Wooster | 110 | Wayne County |
| St Helens Parish And School | OH2838412 | NTNCWS | Newbury | 649 | Geauga County |
| St Henry Village | OH5401312 | CWS | St Henry | 2,596 | Mercer County |
| St John Lutheran School-Napoleon | OH3536112 | NTNCWS | Napoleon | 170 | Henry County |
| St Johns Hilltop Preschool | OH8739112 | NTNCWS | Stony Ridge | 136 | Wood County |
| St Louisville Village Pws | OH4504012 | CWS | Newark | 374 | Licking County |
| St Peter Church / Panda Preschool Pws | OH8548012 | NTNCWS | Wooster | 195 | Wayne County |
| St. Anselm Parish And School | OH2838112 | NTNCWS | Chesterland | 950 | Geauga County |
| St. Johns Lutheran School | OH8034312 | NTNCWS | Marysville | 302 | Union County |
| St. Joseph School-Mogadore | OH6753912 | NTNCWS | Mogadore | 150 | Portage County |
| St. Luke Lutheran Community - Portage La | OH7708812 | CWS | Akron | 143 | Summit County |
| St. Pauls Lutheran School | OH8034412 | NTNCWS | Milford Center | 131 | Union County |
| Stahl, A Scott Fetzer Co | OH8547712 | NTNCWS | Wooster | 85 | Wayne County |
| Stimmel Properties Llc | OH2549412 | NTNCWS | Columbus | 40 | Franklin County |
| Stockport Village Pws | OH5800912 | CWS | Stockport | 503 | Morgan County |
| Stoneybrooke Village Mhp | OH7802912 | CWS | San Diego | 250 | Trumbull County |
| Strasburg Village Pws | OH7901212 | CWS | Strasburg | 2,610 | Tuscarawas County |
| Stratton Pws | OH4102512 | CWS | Wellsville | 320 | Jefferson County |
| Stryker Village | OH8601712 | CWS | Archbold | 1,259 | Williams County |
| Suburban Mobile Home Park | OH4502812 | CWS | St Petersburg | 53 | Licking County |
| Suburbans Community Mhp | OH4901612 | CWS | New York | 655 | Franklin County, Madison County |
| Suffield Elementary School | OH6754312 | NTNCWS | Mogadore | 418 | Portage County |
| Sugar Grove Village Pws | OH2302112 | CWS | Sugar Grove | 426 | Fairfield County |
| Sugarcreek Village Pws | OH7901312 | CWS | Sugarcreek | 2,220 | Tuscarawas County |
| Summitville Tiles, Inc. | OH1039112 | NTNCWS | Minerva | 125 | Carroll County |
| Sun Valley Family Campground | OH0252212 | CWS | Harrod | 462 | Allen County |
| Sundial Mobile Home Park | OH8503912 | CWS | Dover | 75 | Wayne County |
| Sunset Mobile Home Park | OH6502412 | CWS | Boyton Beach | 80 | Pickaway County |
| Sunset Terrace Mobile Home Park | OH1101112 | CWS | Bradford | 70 | Champaign County |
| Sutphen Corporation | OH2545512 | NTNCWS | Dublin | 160 | Franklin County |
| Swancreek Water District Pws | OH2601512 | CWS | Delta | 1,269 | Fulton County |
| Swanton Meadows | OH2601212 | CWS | West Covina | 180 | Fulton County |
| Switzer Water Association | OH5600603 | CWS | Powhattan Point | 1,860 | Monroe County |
| Switzerland Of Ohio Water | OH5600503 | CWS | Jerusalem | 2,500 | Monroe County |
| Sycamore Village Pws | OH8800412 | CWS | Sycamore | 862 | Wyandot County |
| Syracuse Village Pws | OH5300512 | CWS | Syracuse | 826 | Meigs County |
| Tahoma Engineered Solutions | OH0337412 | NTNCWS | Ashland | 43 | Ashland County |
| Tallmadge-Portage County Pws | OH6740003 | NTNCWS | Tallmadge | 1,400 | Portage County |
| Tammis Mobile Village Ltd. Pws | OH4602712 | CWS | Lorain | 98 | Logan County |
| Tanglewood Lake Water Co | OH2802512 | CWS | Chagrin Falls | 1,800 | Geauga County |
| Tarkett North | OH2840112 | NTNCWS | Warren | 240 | Geauga County |
| Tarkett South | OH2840212 | NTNCWS | Chagrin Falls | 80 | Geauga County |
| Tcmsd-Baltic Pws | OH7900112 | CWS | Bolivar | 795 | Holmes County, Tuscarawas County |
| Tcmsd-Dundee Pws | OH7902012 | CWS | Bolivar | 441 | Tuscarawas County |
| Tcmsd-Wainwright Pws | OH7902103 | CWS | Bolivar | 370 | Tuscarawas County |
| Teague Brothers Shopping | OH2857512 | NTNCWS | Newbury | 120 | Geauga County |
| Tecumseh Schools Main Campus | OH1251812 | NTNCWS | New Carlisle | 2,100 | Clark County |
| Telesis Technologies Inc | OH6539812 | NTNCWS | Circleville | 98 | Pickaway County |
| The Chapel & Daycare In Marlboro | OH7671212 | NTNCWS | Louisville | 298 | Stark County |
| The Cyril-Scott Co Pws | OH2348412 | NTNCWS | Lancaster | 111 | Fairfield County |
| The Golf Club Pws | OH2565912 | NTNCWS | New Albany | 40 | Franklin County |
| The Grove Comm. Christian Church Pws | OH2352212 | NTNCWS | Baltimore | 245 | Fairfield County |
| The Logan Lodge | OH1137119 | CWS | Columbus | 28 | Champaign County |
| The Pavilion At Canal Fulton | OH7602112 | CWS | Canal Fulton | 95 | Stark County |
| The Reserve - Medical Center And Spa | OH7748912 | NTNCWS | Akron | 110 | Summit County |
| The Schnipke Engraving Company | OH6945612 | NTNCWS | Ottawa | 155 | Putnam County |
| The Virtues Golf Club Clubhouse Pws | OH4560932 | NTNCWS | Nashport | 150 | Licking County |
| The Way International | OH7501412 | CWS | New Knoxville | 248 | Shelby County |
| Thieman Quality Metal Fab Company Pws | OH0632912 | NTNCWS | New Bremen | 95 | Auglaize County |
| Thornville, Village Of | OH6401212 | CWS | Thornville | 991 | Perry County |
| Thorson Baker And Assoc Inc 1 Pws | OH7782412 | NTNCWS | Richfield | 72 | Summit County |
| Thorson Baker And Assoc Inc 2 Pws | OH7727612 | NTNCWS | Richfield | 25 | Summit County |
| Three Rivers Energy Llc Pws | OH1638412 | NTNCWS | Coshocton | 38 | Coshocton County |
| Thunderbird Terrace Mhp | OH7605512 | CWS | Bloomfield Hill | 122 | Stark County |
| Thurston Village Pws | OH2302903 | CWS | Thurston | 604 | Fairfield County |
| Tiffin Loader Crane Company | OH7449412 | NTNCWS | Tiffin | 75 | Seneca County |
| Tiltonsville Pws | OH4102712 | CWS | Tiltonsville | 1,372 | Jefferson County |
| Tip Plus Corp | OH5051912 | NTNCWS | Canfield | 34 | Mahoning County |
| Toledo Edison - Lindsey Service Center | OH7243212 | NTNCWS | Holland | 31 | Sandusky County |
| Tolles Technical Center | OH4931112 | NTNCWS | Plain City | 723 | Madison County |
| Tontogany Village Pws | OH8702503 | CWS | Tontogany | 400 | Wood County |
| Top O Hill Mhp Pws | OH7603912 | CWS | Akron | 50 | Stark County |
| Towbridge Development | OH7708112 | CWS | Hudson | 352 | Summit County |
| Transportation Research Center Pws | OH4644012 | NTNCWS | East Liberty | 140 | Logan County |
| Travel Centers Of America | OH4937712 | NTNCWS | Westlake | 2,490 | Madison County |
| Travel Centers Of America 11 Pws | OH6832712 | NTNCWS | Westlake | 990 | Preble County |
| Travel Centers Of America 39 | OH4544512 | NTNCWS | Westlake | 2,100 | Licking County |
| Trees Condominium | OH2803212 | CWS | Beechwood | 50 | Geauga County |
| Tri-County Rural W And S District | OH8403112 | CWS | Waterford | 3,000 | Washington County |
| Tri-County Water Authority | OH3401403 | CWS | Harrisville | 2,370 | Belmont County, Harrison County, Jefferson County |
| Triad High School | OH1136212 | NTNCWS | North Lewisburg | 300 | Champaign County |
| Triad Middle School | OH1134912 | NTNCWS | North Lewisburg | 675 | Champaign County |
| Tricor Metals | OH8530512 | NTNCWS | Wooster | 98 | Wayne County |
| Trihealth Good Samaritan Hospital | OH3139923 | NTNCWS | Cincinnati | 4,000 | Hamilton County |
| Trillium Farm Holdings-Marseilles | OH8841212 | NTNCWS | Mt. Vernon | 55 | Wyandot County |
| Trillium Farm Holdings-Mt Victory | OH3335112 | NTNCWS | Mt. Vernon | 55 | Hardin County |
| Trillium Farms Layer 1 Pws | OH4555612 | NTNCWS | Mt. Vernon | 60 | Licking County |
| Trillium Farms Layer 3 Pws | OH4555812 | NTNCWS | Mt. Vernon | 40 | Licking County |
| Trillium Farms Layer 4 Pws | OH4555912 | NTNCWS | Mt. Vernon | 60 | Licking County |
| Trimble Village Pws | OH0501703 | CWS | Trimble | 480 | Athens County |
| Trinity Lutheran School-Jenera | OH3245912 | NTNCWS | Jenera | 304 | Hancock County |
| Triway K-12 School | OH8549412 | NTNCWS | Wooster | 820 | Wayne County |
| Troy Oaks Homes | OH2802712 | CWS | West Chester | 450 | Geauga County |
| Trufast Organization | OH8641812 | NTNCWS | Bryan | 230 | Williams County |
| Trumbull Co. - Braceville Twp Pws | OH7806503 | CWS | Vienna | 835 | Trumbull County |
| Trumbull Co. - Mineral Ridge Pws | OH7803503 | CWS | Vienna | 2,858 | Mahoning County, Trumbull County |
| Trumbull Co. - Mosquito Creek Pws | OH7806403 | CWS | Vienna | 1,708 | Trumbull County |
| Trumbull Co. - Warren Twp Pws | OH7806112 | CWS | Vienna | 740 | Trumbull County |
| Tuscarawas Village | OH7901512 | CWS | Tuscarawas | 1,056 | Tuscarawas County |
| Twin Maples Mhp | OH8702712 | CWS | Gibsonburg | 45 | Wood County |
| Twin Pines Mhp | OH6501312 | CWS | Lockbourne | 69 | Pickaway County |
| Twin Rivers Water Corporation | OH3102303 | CWS | Harrison | 245 | Hamilton County |
| Uc Health Medical Center Scis | OH3139913 | NTNCWS | Cincinnati | 558 | Hamilton County |
| Uc Health Ridgeway Tower | OH3139922 | NTNCWS | Cincinnati | 208 | Hamilton County |
| Union City Village Pws | OH1901212 | CWS | Union City | 1,650 | Darke County |
| United Local Schools | OH1544612 | NTNCWS | Hanoverton | 1,340 | Columbiana County |
| Universal Polymer-Plant1 | OH2837012 | NTNCWS | Middlefield | 85 | Geauga County |
| University Of Findlay-South Campus | OH3244912 | NTNCWS | Findlay | 175 | Hancock County |
| Utica Village Pws | OH4503012 | CWS | Utica | 2,235 | Licking County |
| V&S Schuler Engineering, Inc. | OH2876929 | NTNCWS | Burton | 50 | Geauga County |
| Valley Mobile Home Park | OH4503112 | CWS | Seattle | 120 | Licking County |
| Valley Mobile Homes | OH7803712 | CWS | Bexley | 100 | Trumbull County |
| Valley Office Park And Preschool Pws | OH7789612 | NTNCWS | Akron | 68 | Summit County |
| Valley View Mennonite School And Church | OH8556312 | NTNCWS | Apple Creek | 60 | Wayne County |
| Vanlue Village Pws | OH3248312 | CWS | Vanlue | 340 | Hancock County |
| Velvet Ice Cream Company | OH4537412 | NTNCWS | Utica | 237 | Licking County |
| Verhoff Machine And Welding | OH6943312 | NTNCWS | Continental | 120 | Putnam County |
| Verona, Village Of | OH6801212 | CWS | Verona | 492 | Darke County, Preble County |
| Versailles Village Pws | OH1901312 | CWS | Versailles | 2,687 | Darke County |
| Victory Christian School | OH1135712 | NTNCWS | Urbana | 359 | Champaign County |
| Villa Maria Teresa Preschool | OH7843212 | NTNCWS | Hubbard | 84 | Trumbull County |
| Villa Vista Mobile Home | OH4504312 | CWS | Chardon | 236 | Licking County |
| Village Green Mhp | OH8702412 | CWS | Perrysburg | 272 | Wood County |
| Village Of Bloomingburg | OH2400012 | CWS | Bloomingburg | 878 | Fayette County |
| Village Of Orient | OH6503703 | CWS | Circleville | 128 | Pickaway County |
| Voyager Village Mhp | OH5702712 | CWS | Maumee | 400 | Montgomery County |
| Wagon Wheel Mobile Home | OH6502812 | CWS | Columbus | 118 | Pickaway County |
| Wagoner Home Rental Pws | OH8753213 | CWS | Perrysburg | 76 | Wood County |
| Wakeman Village Pws | OH3901411 | CWS | Wakeman | 1,047 | Huron County |
| Walnut Creek Planing Pws | OH3850612 | NTNCWS | Millersburg | 160 | Holmes County |
| Walnut Creek Water Co. | OH3801512 | CWS | Walnut Creek | 1,270 | Holmes County |
| Walnut Hills Water Association | OH7005032 | CWS | Mansfield | 583 | Richland County |
| Warren Co. Pennyroyal Area Pws | OH8301803 | CWS | Lebanon | 950 | Warren County |
| Warren Co. Sharts Road Pws | OH8346912 | CWS | Lebanon | 145 | Warren County |
| Warren Water Authority | OH4102903 | CWS | Rayland | 481 | Belmont County, Jefferson County |
| Washington Elementary School | OH7644312 | NTNCWS | Alliance | 302 | Stark County |
| Washingtonville Village Pws | OH1502812 | CWS | Washingtonville | 801 | Columbiana County, Mahoning County |
| Waterfall Estates Mhp | OH7002112 | CWS | Columbus | 51 | Richland County |
| Waterloo K-12 Campus Pws | OH6756912 | NTNCWS | Atwater | 1,400 | Portage County |
| Wayne County Care Center | OH8504212 | CWS | Wooster | 173 | Wayne County |
| Wayne County Engineers Office Pws | OH8534612 | NTNCWS | Wooster | 44 | Wayne County |
| Wayne Mhp Lp | OH8300212 | CWS | Brooklyn | 175 | Warren County |
| Wayne Trace High School | OH6331312 | NTNCWS | Haviland | 524 | Paulding County |
| Wayne Village Pws | OH8703112 | CWS | Wayne | 941 | Wood County |
| Waynesburg Village Pws | OH7605712 | CWS | Waynesburg | 950 | Stark County |
| Waynesfield Village Pws | OH0600912 | CWS | Waynesfield | 831 | Auglaize County |
| Weaver Leather Llc | OH3847612 | NTNCWS | Mount Hope | 349 | Holmes County |
| West Alexandria Day Care Center, Inc. | OH6830612 | NTNCWS | West Alexandria | 46 | Preble County |
| West Alexandria, Village Of | OH6801312 | CWS | West Alexandria | 1,385 | Preble County |
| West Farmington Village Pws | OH7803911 | CWS | West Farmington | 908 | Trumbull County |
| West Geauga Campus | OH2843012 | NTNCWS | Chesterland | 1,298 | Geauga County |
| West Geauga Plaza-East | OH2854312 | NTNCWS | Bainbridge Township | 30 | Geauga County |
| West Geauga Plaza-Main | OH2860212 | NTNCWS | Bainbridge Twp | 1,997 | Geauga County |
| West Holmes High School | OH3847812 | NTNCWS | Millersburg | 1,275 | Holmes County |
| West Lake Village Mhp Pws | OH7501512 | CWS | Minster | 83 | Shelby County |
| West Liberty Village Pws | OH4602412 | CWS | West Liberty | 1,800 | Logan County |
| West Liberty-Salem School | OH1134012 | NTNCWS | West Liberty | 1,315 | Champaign County |
| West Manchester, Village Of | OH6801412 | CWS | West Manchester | 471 | Preble County |
| West Mansfield Village Pws | OH4602512 | CWS | West Mansfield | 700 | Logan County |
| West Salem Village Pws | OH8504311 | CWS | W Salem | 1,410 | Wayne County |
| West Union Public Water System | OH0100503 | CWS | West Union | 3,170 | Adams County |
| West Unity Village | OH8601812 | CWS | West Unity | 1,760 | Williams County |
| Western Guernsey Regional Water District | OH3001103 | CWS | Cambridge | 3,225 | Guernsey County |
| Western Reserve Hospital Pws | OH7799949 | NTNCWS | Cuyahoga Falls | 856 | Summit County |
| Western Reserve Schools (K-12 Campus) | OH5040012 | NTNCWS | Berlin Center | 855 | Mahoning County |
| Western Reserve Village | OH7704012 | CWS | Akron | 120 | Summit County |
| Westfall Elementary School Pws | OH6541612 | NTNCWS | Williamsport | 750 | Pickaway County |
| Westfall Middle Scl And High Scl Pw | OH6542712 | NTNCWS | Williamsport | 853 | Pickaway County |
| Westgate Mobile Home Community | OH4201712 | CWS | Clinton Twp | 150 | Knox County |
| Westlake Royal Stone, Llc - Holmes Co | OH3850812 | NTNCWS | Mt Eaton | 80 | Holmes County |
| Westlake Royal Stone, Llc - Wayne Co | OH8564725 | NTNCWS | Mt Eaton | 83 | Wayne County |
| Westview Mhp | OH8504412 | CWS | Chardon | 450 | Wayne County |
| Westwood Elementary School | OH2839312 | NTNCWS | Chesterland | 404 | Geauga County |
| Whispering Pines Mobile Home Park | OH6500712 | CWS | Boyton Beach | 62 | Pickaway County |
| Whispering Valley Mhp | OH4600312 | CWS | London | 70 | Logan County |
| Whispering Winds Mhc | OH4801012 | CWS | Grand Rapids | 100 | Lucas County |
| Whitetail Run Homeowners | OH2803512 | CWS | Independence | 250 | Geauga County |
| Whitewater Processing, Llc | OH3136212 | NTNCWS | Harrison | 120 | Hamilton County |
| Wilders Mobile Home Park Pws | OH2803012 | CWS | Chardon | 211 | Geauga County |
| Wilkins Mobile Home Park | OH4503312 | CWS | Newark | 115 | Licking County |
| Williams Co/Hillside Country Living | OH8601912 | CWS | Bryan | 225 | Williams County |
| Williams County Engineer Office | OH8634812 | NTNCWS | Bryan | 33 | Williams County |
| Williamsburg Village Pws | OH1301411 | CWS | Williamsburg | 2,490 | Brown County, Clermont County |
| Williamsport Village Pws | OH6503012 | CWS | Williamsport | 1,038 | Pickaway County |
| Willow Park Water Association | OH7005112 | CWS | Mansfield | 200 | Richland County |
| Willow Rest Trailer Park | OH7705312 | CWS | Akron | 155 | Summit County |
| Willow Wood Global Llc | OH6537912 | NTNCWS | Mt. Sterling | 136 | Pickaway County |
| Willshire Village Pws | OH8100911 | CWS | Willshire | 405 | Van Wert County |
| Wilmot Village Pws | OH7606012 | CWS | Wilmot | 325 | Stark County |
| Winbury Professional Center Pws | OH2870112 | NTNCWS | Chagrin Falls | 252 | Geauga County |
| Winchester Public Water System | OH0100603 | CWS | Seaman | 1,052 | Adams County |
| Windham Village Pws | OH6704812 | CWS | Windham | 1,777 | Portage County |
| Winding Creek Estates | OH4500512 | CWS | Newark | 57 | Licking County |
| Winesburg Area Development Corporation | OH3801412 | CWS | Winesburg | 1,575 | Holmes County |
| Wise Elementary School | OH3838912 | NTNCWS | Millersburg | 130 | Holmes County |
| Woodbury Apartments Pws | OH1201512 | CWS | Dayton | 120 | Clark County |
| Woodbury Glen Condominiums Pws | OH7675212 | CWS | North Canton | 210 | Stark County |
| Woodland Hills Estates Ii | OH5800712 | CWS | Zanesville | 70 | Morgan County |
| Woodsfield Village Pws | OH5600711 | CWS | Woodsfield | 2,598 | Monroe County |
| Woodville Village | OH7200912 | CWS | Woodville | 2,006 | Sandusky County |
| Wooster Motor Ways Inc. | OH8558712 | NTNCWS | Wooster | 100 | Wayne County |
| Wooster Rolling Wheels Estates Mhp | OH8503112 | CWS | Wooster | 169 | Wayne County |
| Wright Field Child Development Center | OH2958715 | NTNCWS | Wpafb | 888 | Greene County |
| Wright Patterson Medical Center Pws | OH2958713 | NTNCWS | Wpafb | 2,401 | Greene County, Warren County |
| Xpo Logistics Freight Inc - Xac | OH7786512 | NTNCWS | Ann Arbor | 90 | Summit County |
| Yoder Lumber Co. - Buckhorn Division Pws | OH3835412 | NTNCWS | Millersburg | 64 | Holmes County |
| York Elementary School | OH7942012 | NTNCWS | New Philadelphia | 188 | Tuscarawas County |
| York Township Water Authority Pws | OH0701703 | CWS | Powhatan Point | 481 | Belmont County |
| Yorkville Village Pws | OH4103112 | CWS | Yorkville | 1,019 | Belmont County, Jefferson County |
| Young Trucks - Rjaz Properties | OH7677652 | NTNCWS | Canton | 70 | Stark County |
| Youngs Jersey Dairy Pws | OH1240412 | NTNCWS | Yellow Springs | 1,340 | Clark County |
| Zaleski Village Pws | OH8200512 | CWS | Zaleski | 360 | Vinton County |
| Zarbana Aluminum Extrusions, Llc | OH1566212 | NTNCWS | Columbiana | 75 | Columbiana County |
| Zion Christian School | OH3839412 | NTNCWS | Millersburg | 77 | Holmes County |
| Zion Lutheran Church - Luckey | OH8750912 | NTNCWS | Luckey | 87 | Wood County |