952 community and non-transient non-community water systems are listed for Connecticut in EPA SDWIS. 65 were sampled under UCMR 5; 41 of those had at least one PFAS result at or above the reporting level, and 36 had a highest single result at or above a 2024 EPA limit (PFOA or PFOS 4 ppt, or Hazard Index 1).
Connecticut 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 (65)
| System | PWSID | City | Population | Highest PFOA (ppt) | Highest PFOS (ppt) | Highest HI | Highest single result |
|---|---|---|---|---|---|---|---|
| Aquarion-Darien | CT0350011 | Shelton | 18,737 | 5.8 | <MRL | 0 | PFOA 1–3 × its limit |
| Aquarion-Eastern Fairfield County | CT0150011 | Shelton | 351,756 | 10.9 | 6.6 | 0.002 | PFOA 1–3 × its limit |
| Aquarion-Greenwich | CT0570011 | Shelton | 53,297 | 5.6 | 4.1 | 0 | PFOA 1–3 × its limit |
| Aquarion-Litchfield Regional | CT0740011 | Shelton | 3,097 | <MRL | <MRL | 0 | No PFAS detected |
| Aquarion-Mystic | CT1370011 | Shelton | 10,788 | <MRL | <MRL | 0.002 | Hazard Index below its limit |
| Aquarion-New Canaan | CT0900011 | Shelton | 10,097 | 5.6 | <MRL | 0 | PFOA 1–3 × its limit |
| Aquarion-New Hartford | CT0920011 | Shelton | 1,872 | <MRL | <MRL | 0 | No PFAS detected |
| Aquarion-New Milford Regional | CT0960011 | Shelton | 13,331 | 5.3 | 5.3 | 0.003 | PFOA 1–3 × its limit |
| Aquarion-Newtown Regional | CT0970011 | Shelton | 6,054 | 15.9 | 12.7 | 0.493 | PFOA ≥ 3 × its limit |
| Aquarion-Plainville Regional | CT1100011 | Shelton | 18,231 | 5.2 | 6.8 | 0 | PFOS 1–3 × its limit |
| Aquarion-Ridgefield | CT1180011 | Shelton | 7,476 | 10.6 | 6.1 | 0.002 | PFOA 1–3 × its limit |
| Aquarion-Simsbury Regional | CT1280021 | Shelton | 14,691 | 4.4 | 4.3 | 0.37 | PFOA 1–3 × its limit |
| Aquarion-Stamford | CT1350011 | Shelton | 119,214 | 4.3 | <MRL | 0 | PFOA 1–3 × its limit |
| Aquarion-Valley | CT1240011 | Shelton | 13,080 | 8.1 | 6.9 | 0.002 | PFOA 1–3 × its limit |
| Aquarion-Woodrich Village | CT1666011 | Shelton | 72 | 6.3 | 6.2 | 0.002 | PFOA 1–3 × its limit |
| Avon Water Co | CT0040011 | Clinton | 11,590 | 7 | 8 | 0.002 | PFOS 1–3 × its limit |
| Berlin Water Control Commission | CT0070021 | Berlin | 5,128 | <MRL | <MRL | 0.38 | Hazard Index below its limit |
| Bethel Water Dept | CT0090011 | Bethel | 9,507 | 5.9 | <MRL | 0.002 | PFOA 1–3 × its limit |
| Bristol Water Department | CT0170011 | Bristol | 52,079 | 4.1 | <MRL | 0 | PFOA 1–3 × its limit |
| Colchester Sewer & Water Commission | CT0280011 | Colchester | 4,020 | <MRL | 9 | 0.36 | PFOS 1–3 × its limit |
| Cromwell Fire District Water Department | CT0330011 | Cromwell | 14,316 | <MRL | 4.6 | 0.87 | PFOS 1–3 × its limit |
| Ctwc - Coventry Hills Div | CT0320091 | Clinton | 700 | <MRL | <MRL | 0 | No PFAS detected |
| Ctwc - Crystal System | CT0690011 | Clinton | 6,378 | 9.9 | 6.8 | 0.4 | PFOA 1–3 × its limit |
| Ctwc - Naugatuck Reg-Collinsville Sys | CT0230011 | Clinton | 6,324 | 4.9 | 5.6 | 0 | PFOS 1–3 × its limit |
| Ctwc - Naugatuck Reg-Terryville System | CT1110011 | Clinton | 5,607 | <MRL | <MRL | 0 | No PFAS detected |
| Ctwc - Naugatuck Reg-Thomaston System | CT1400011 | Clinton | 3,789 | <MRL | <MRL | 0 | No PFAS detected |
| Ctwc - Naugatuck Region-Central System | CT0880011 | Clinton | 22,735 | <MRL | <MRL | 0 | No PFAS detected |
| Ctwc - Northern Reg-Western System | CT0473011 | Clinton | 101,313 | 8 | 6 | 0.301 | PFOA 1–3 × its limit |
| Ctwc - Shoreline Region-Chester System | CT0261031 | Clinton | 5,030 | <MRL | <MRL | 0 | No PFAS detected |
| Ctwc - Shoreline Region-Guilford System | CT0608011 | Clinton | 33,975 | 6 | 12 | 0.4 | PFOS ≥ 3 × its limit |
| Ctwc - Unionville System | CT0520011 | Clinton | 14,693 | 6 | 6 | 0.3 | PFOA 1–3 × its limit |
| Danbury Water Department | CT0340011 | Danbury | 62,055 | 5.4 | <MRL | 0.002 | PFOA 1–3 × its limit |
| East Lyme Water & Sewer Commission | CT0450011 | Niantic | 15,245 | 9.2 | 7.2 | 0.002 | PFOA 1–3 × its limit |
| Greenwich American Center | CT0570062 | Greenwich | 800 | <MRL | <MRL | 0 | No PFAS detected |
| Groton Utilities | CT0590011 | Groton | 30,200 | <MRL | <MRL | 0 | No PFAS detected |
| Hazardville Water Company | CT0490021 | Enfield | 18,544 | 8.6 | 5.4 | 0.812 | PFOA 1–3 × its limit |
| Heritage Water Company | CT1300021 | Clinton | 7,300 | 4.1 | <MRL | 0.002 | PFOA 1–3 × its limit |
| Jewett City Water Company | CT0580011 | Enfield | 6,840 | <MRL | <MRL | 0 | Other PFAS detected |
| Kensington Fire District | CT0070011 | Kensington | 7,553 | <MRL | <MRL | 0 | No PFAS detected |
| Manchester Water Department | CT0770021 | Manchester | 51,198 | 13 | 16 | 0.383 | PFOS ≥ 3 × its limit |
| Mashantucket Pequot Water System | 010106001 | Mashantucket | 22,171 | 7.4 | <MRL | 0.002 | PFOA 1–3 × its limit |
| Meriden Water Division | CT0800011 | Meriden | 58,441 | 6.1 | 9.5 | 0.402 | PFOS 1–3 × its limit |
| Metropolitan District Commission | CT0640011 | Hartford | 390,887 | <MRL | <MRL | 0 | No PFAS detected |
| Middlebury Hamlet | CT0810054 | Prospect | 75 | <MRL | <MRL | 0 | No PFAS detected |
| Middletown Water Department | CT0830011 | Middletown | 41,019 | <MRL | <MRL | 0 | No PFAS detected |
| Mohegan Tribal Utility Authority | 010109005 | Uncasville | 31,961 | <MRL | <MRL | 0 | No PFAS detected |
| New Britain Water Department | CT0890011 | New Britain | 73,534 | <MRL | <MRL | 0 | No PFAS detected |
| New London Dept. Of Public Utilities | CT0950011 | Waterford | 27,620 | <MRL | <MRL | 0 | No PFAS detected |
| Norwalk First Taxing District | CT1030011 | Norwalk | 40,256 | 9.5 | 11.2 | 0.423 | PFOS 1–3 × its limit |
| Norwich Public Utilities | CT1040011 | Norwich | 36,163 | 6.7 | 16.2 | 1.253 | PFOS ≥ 3 × its limit |
| Portland Water Department | CT1130011 | Portland | 5,010 | <MRL | <MRL | 0 | Other PFAS detected |
| Putnam Water Pollution Control Authority | CT1160011 | Putnam | 7,300 | 8.5 | 7.5 | 0.4 | PFOA 1–3 × its limit |
| Regional Water Authority | CT0930011 | New Haven | 418,900 | 7.1 | 10.7 | 0.002 | PFOS 1–3 × its limit |
| South Norwalk Electric & Water | CT1030021 | Wilton | 42,000 | <MRL | <MRL | 0 | No PFAS detected |
| Southington Water Department | CT1310011 | Southington | 43,069 | 8 | 6 | 0.002 | PFOA 1–3 × its limit |
| Sterling Engineering Corp. | CT0050062 | Barkhamsted | 110 | <MRL | <MRL | 0 | No PFAS detected |
| Torrington Water Company | CT1430011 | Shelton | 37,915 | <MRL | <MRL | 0 | No PFAS detected |
| University Of Connecticut - Main Campus | CT0780021 | Storrs | 27,199 | <MRL | 5 | 0 | PFOS 1–3 × its limit |
| Wallingford Water Department | CT1480011 | Wallingford | 37,267 | <MRL | 13.9 | 1.072 | PFOS ≥ 3 × its limit |
| Waterbury Water Department | CT1510011 | Waterbury | 107,271 | <MRL | <MRL | 0 | No PFAS detected |
| Waterford Wpca | CT1520071 | Waterford | 16,578 | <MRL | <MRL | 0 | No PFAS detected |
| Watertown Fire District | CT1530011 | Watertown | 6,718 | <MRL | <MRL | 0 | No PFAS detected |
| Watertown Water & Sewer Authority | CT1530021 | Oakville | 9,972 | <MRL | <MRL | 0 | No PFAS detected |
| Windham Water Works | CT1630011 | Mansfield Center | 21,214 | <MRL | <MRL | 0 | Other PFAS detected |
| Winsted Water Works | CT1620011 | Winsted | 7,784 | <MRL | <MRL | 0 | No PFAS detected |
Not tested under UCMR 5 (887)
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 |
|---|---|---|---|---|---|
| 1 Orchard Park Industrial Area | CT0769103 | NTNCWS | Madison | 25 | New Haven County |
| 1 Salmon Brook Street | CT0565073 | NTNCWS | Granby | 80 | Hartford County |
| 125 Commerce Drive | CT0189923 | NTNCWS | Brookfield | 37 | Fairfield County |
| 125-131 Bradley Road - Woodbridge | CT1670173 | NTNCWS | Woodbridge | 385 | New Haven County |
| 144 Oxford Road, Llc | CT1085013 | NTNCWS | Hamden | 25 | New Haven County |
| 15 Orchard Park Industrial Area | CT0769113 | NTNCWS | Madison | 50 | New Haven County |
| 171 Amity Road | CT0081143 | NTNCWS | Bethany | 180 | New Haven County |
| 201 West High Street | CT0429213 | NTNCWS | East Hampton | 68 | Middlesex County |
| 227 Horse Pond Road - Madison | CT0769203 | NTNCWS | Madison | 55 | New Haven County |
| 23 Amity Road | CT0081063 | NTNCWS | Danielson | 38 | New Haven County |
| 255 Route 80 - Killingworth | CT0709123 | NTNCWS | Killingworth | 32 | Middlesex County |
| 27 Maple Drive | CT0859071 | CWS | Monroe | 38 | Fairfield County |
| 283 Litchfield Rd, Llc | CT0660414 | NTNCWS | Harwinton | 74 | Litchfield County |
| 298-302 Albany Turnpike | CT0231011 | CWS | Canton | 28 | Hartford County |
| 3 Smith Street | CT0429143 | NTNCWS | East Hampton | 48 | Middlesex County |
| 31 Grist Mill Rd | CT0419221 | CWS | Old Lyme | 30 | Middlesex County |
| 31 Old Route Seven | CT0189993 | NTNCWS | Bethel | 50 | Fairfield County |
| 39 Hop Brook Rd - Apt Complex | CT0189971 | CWS | Brookfield | 36 | Fairfield County |
| 4 West Granby Road | CT0565063 | NTNCWS | Granby | 97 | Hartford County |
| 41 Village Lane Office Park | CT0081083 | NTNCWS | Bethany | 33 | New Haven County |
| 411C Norwich Westerly Rd | CT1021073 | NTNCWS | Griswold | 100 | New London County |
| 42 E High St. | CT0429103 | NTNCWS | South Glastonbury | 25 | Middlesex County |
| 464 Wolcott Road | CT1660584 | NTNCWS | Oxford | 40 | New Haven County |
| 5 Ardsley Avenue | CT0990713 | NTNCWS | East Hampton | 50 | New Haven County |
| 55 Sugar Street | CT0970071 | CWS | Sandy Hook | 158 | Fairfield County |
| 6 Way Road | CT0829084 | NTNCWS | Middlefield | 78 | Middlesex County |
| 60 Hartford Pike | CT0699213 | NTNCWS | Pomfret Center | 29 | Windham County |
| 7 Berkshire Road - Newtown | CT0979343 | NTNCWS | Newtown | 103 | Fairfield County |
| 720 Branchville Llc | CT1180034 | NTNCWS | Ridgefield | 100 | Fairfield County |
| 74 Route 37, Llc | CT0915203 | NTNCWS | New Fairfield | 130 | Fairfield County |
| 8 Mill Plain Road | CT0347073 | NTNCWS | Danbury | 59 | Fairfield County |
| 890 Boston Turnpike | CT0121081 | CWS | Tolland | 60 | Tolland County |
| 890 Ethan Allen Highway - Ridgefield | CT1189063 | NTNCWS | Lyme | 138 | Fairfield County |
| 980 Rubber Avenue | CT0880053 | NTNCWS | Naugatuck | 84 | New Haven County |
| A Behavioral Approach | CT1050813 | NTNCWS | Clinton | 75 | New London County |
| Aaron Manor Nursing & Rehab Center | CT0261001 | CWS | Chester | 81 | Middlesex County |
| Abby Water Llc | CT0670021 | CWS | Thompson | 100 | Tolland County |
| Able Coil And Electronics | CT0121114 | NTNCWS | Bolton | 40 | Tolland County |
| Acceleron | CT0400182 | NTNCWS | East Granby | 25 | Hartford County |
| Alcott School | CT1661292 | NTNCWS | Wolcott | 638 | New Haven County |
| American Distilling & Manufacturing, Inc | CT0420024 | NTNCWS | East Hampton | 55 | Middlesex County |
| Amgraph Packaging, Inc. | CT1330062 | NTNCWS | Baltic | 125 | New London County |
| Amity Regional Junior High School | CT0080162 | NTNCWS | Bethany | 475 | New Haven County |
| Amity Village - Bethany 63 Plaza | CT0080024 | NTNCWS | Oakville | 65 | New Haven County |
| Andover Elementary School | CT0010102 | NTNCWS | Andover | 381 | Tolland County |
| Annie E. Vinton School | CT0781253 | NTNCWS | Mansfield | 31 | Tolland County |
| Antolini Elementary School | CT0920252 | NTNCWS | New Hartford | 385 | Litchfield County |
| Api Franklin, Llc | CT0530253 | NTNCWS | Dover | 39 | New London County |
| Apple Rehab | CT1190021 | CWS | Avon | 238 | Hartford County |
| Apple Valley Village | CT1310031 | CWS | Stamford | 70 | Hartford County |
| Aqua Vista Assoc, Inc | CT0340111 | CWS | Danbury | 388 | Fairfield County |
| Aquarion-Arlington Acres | CT1370071 | CWS | Shelton | 392 | New London County |
| Aquarion-Ball Pond | CT0910011 | CWS | Shelton | 629 | Fairfield County |
| Aquarion-Barnum | CT1189171 | CWS | Shelton | 120 | Fairfield County |
| Aquarion-Berkshire | CT0090292 | CWS | Shelton | 75 | Fairfield County |
| Aquarion-Birches | CT0911091 | CWS | Shelton | 66 | Fairfield County |
| Aquarion-Butternut | CT0180021 | CWS | Shelton | 124 | Fairfield County |
| Aquarion-Carmen Hill | CT0960101 | CWS | Shelton | 322 | Fairfield County, Litchfield County |
| Aquarion-Clearview Hills | CT1668011 | CWS | Shelton | 215 | New Haven County |
| Aquarion-Cornwall | CT0310011 | CWS | Shelton | 98 | Litchfield County |
| Aquarion-Dean Heights | CT0960161 | CWS | Shelton | 162 | Litchfield County |
| Aquarion-East Derby | CT0378011 | CWS | Shelton | 1,101 | New Haven County |
| Aquarion-East Hampton | CT0420011 | CWS | Shelton | 189 | Middlesex County |
| Aquarion-Falls Village | CT0210011 | CWS | Shelton | 488 | Litchfield County |
| Aquarion-Fieldstone Ridge | CT0910021 | CWS | Shelton | 84 | Fairfield County |
| Aquarion-Forest Hills | CT0960141 | CWS | Shelton | 265 | Litchfield County |
| Aquarion-Hawkstone | CT1080011 | CWS | Shelton | 120 | New Haven County |
| Aquarion-Hickory Hills | CT0180101 | CWS | Shelton | 132 | Fairfield County |
| Aquarion-Hollandale Estates | CT0340251 | CWS | Shelton | 200 | Fairfield County |
| Aquarion-Indian Fields | CT0180131 | CWS | Shelton | 147 | Fairfield County |
| Aquarion-Indian Spring | CT0340191 | CWS | Shelton | 242 | Fairfield County |
| Aquarion-Interlaken | CT0911061 | CWS | Shelton | 64 | Fairfield County |
| Aquarion-Judea Depot | CT1500091 | CWS | Shelton | 68 | Litchfield County |
| Aquarion-Judea Main | CT1500021 | CWS | Shelton | 219 | Litchfield County |
| Aquarion-Ken Oaks | CT0340211 | CWS | Shelton | 152 | Fairfield County |
| Aquarion-Kent | CT0680011 | CWS | Shelton | 817 | Litchfield County |
| Aquarion-Lakeside | CT1300031 | CWS | Shelton | 455 | New Haven County |
| Aquarion-Laurel Ridge | CT0960221 | CWS | Shelton | 80 | Litchfield County |
| Aquarion-Lebanon | CT0710021 | CWS | Shelton | 149 | New London County |
| Aquarion-Marlborough | CT0798013 | CWS | Shelton | 1,348 | Hartford County, Middlesex County |
| Aquarion-Mckeon | CT1189161 | CWS | Shelton | 67 | Fairfield County |
| Aquarion-Meadowbrook | CT0960201 | CWS | Shelton | 396 | Litchfield County |
| Aquarion-New Fairfield | CT0915221 | CWS | Shelton | 406 | Fairfield County |
| Aquarion-Norfolk | CT0980011 | CWS | Shelton | 913 | Litchfield County |
| Aquarion-North Canaan | CT1000011 | CWS | Shelton | 1,481 | Litchfield County |
| Aquarion-North Mountain | CT1100112 | NTNCWS | Shelton | 370 | Hartford County |
| Aquarion-Oakwood Acres | CT0910031 | CWS | Shelton | 286 | Fairfield County |
| Aquarion-Oxford Towne Center | CT1085061 | CWS | Shelton | 449 | New Haven County |
| Aquarion-Park Glen | CT0969361 | CWS | Shelton | 37 | Litchfield County |
| Aquarion-Pearce Manor | CT0340081 | CWS | Shelton | 133 | Fairfield County |
| Aquarion-Pleasure Valley | CT1041001 | CWS | Shelton | 328 | New London County |
| Aquarion-Possum Ridge | CT0910041 | CWS | Shelton | 307 | Fairfield County |
| Aquarion-Quarry Ridge | CT1500341 | CWS | Shelton | 84 | Litchfield County |
| Aquarion-Ridgefield Knolls | CT1180021 | CWS | Shelton | 958 | Fairfield County |
| Aquarion-Rolling Ridge | CT0340271 | CWS | Shelton | 115 | Fairfield County |
| Aquarion-Salisbury | CT1220011 | CWS | Shelton | 1,932 | Litchfield County |
| Aquarion-Scodon | CT1180041 | CWS | Shelton | 130 | Fairfield County |
| Aquarion-Suffield | CT1390021 | CWS | Shelton | 595 | Hartford County |
| Aquarion-Timber Trails | CT1270021 | CWS | Shelton | 310 | Fairfield County |
| Aquarion-Twin Oaks | CT0968011 | CWS | Shelton | 152 | Litchfield County |
| Aquarion-Tyler Lake | CT0550011 | CWS | Shelton | 142 | Litchfield County |
| Aquarion-Valley View | CT0780211 | CWS | Shelton | 131 | Tolland County |
| Aquarion-West Shore | CT0819061 | CWS | Shelton | 100 | Litchfield County, New Haven County |
| Aquarion-Woodbury | CT1680011 | CWS | Shelton | 1,209 | Litchfield County |
| Arnio Drive Llc | CT1099141 | CWS | Shewsbury | 33 | Windham County |
| Arrow Point Water Co | CT1490021 | CWS | New Preston | 84 | Litchfield County |
| Arrowhead By The Lake Association, Inc. | CT1669011 | CWS | Seymour | 288 | New Haven County |
| Arrowhead Point Homeowners Assn Inc. | CT0180091 | CWS | Brookfield | 296 | Fairfield County |
| Ash Water Company, Llc | CT0720101 | CWS | Norwich | 108 | New London County |
| Ashford Hills Apartments | CT0030011 | CWS | Ashford | 136 | Windham County |
| Ashford School | CT0030152 | NTNCWS | Ashford | 475 | Windham County |
| Ashland Pond Mobile Home Park | CT0580061 | CWS | Norwich | 74 | New London County |
| Aspetuck Valley Country Club-Clubhouse | CT1570092 | NTNCWS | Weston | 415 | Fairfield County |
| Atlas Commons | CT1069023 | NTNCWS | Branford | 100 | Middlesex County |
| Bakerville Consolidated School | CT0920242 | NTNCWS | New Hartford | 177 | Litchfield County |
| Bantam Village | CT0743011 | CWS | Bantam | 96 | Litchfield County |
| Baptist Fellowship Church | CT0309093 | NTNCWS | Columbia | 48 | Tolland County |
| Barkhamsted Elementary School | CT0055043 | NTNCWS | Barkhamsted | 360 | Litchfield County |
| Barkhamsted Hills Llc | CT0051031 | CWS | Torrington | 50 | Litchfield County |
| Baxter Farms Community Water Assoc | CT1420021 | CWS | Tolland | 175 | Tolland County |
| Bee Brook Crossing Condominiums | CT1500031 | CWS | Washington Depot | 120 | Litchfield County |
| Bellwood Court | CT0420031 | CWS | East Hampton | 31 | Middlesex County |
| Bernhardt Meadow | CT1200071 | CWS | Roxbury | 36 | Litchfield County |
| Bethany Community School | CT0080142 | NTNCWS | Bethany | 550 | New Haven County |
| Bethany Mobile Home Park | CT0081011 | CWS | Stamford | 138 | New Haven County |
| Bethlehem Elementary School/District 14 | CT0100052 | NTNCWS | Woodbury | 406 | Litchfield County |
| Better Val-U Supermarkets, Inc. | CT0221112 | NTNCWS | Cheshire | 50 | Windham County |
| Birch Groves Association, Inc | CT0960061 | CWS | New Milford | 300 | Litchfield County |
| Birch Hills Condominiums | CT0030041 | CWS | East Hartford | 132 | Windham County |
| Birch Mountain School | CT0779073 | NTNCWS | Manchester | 83 | Hartford County |
| Birge Park Commons | CT0660034 | NTNCWS | Torrington | 51 | Litchfield County |
| Bittersweet Ridge Water Association | CT0827081 | CWS | Middlefield | 40 | Middlesex County |
| Blue Trails Water Association | CT0990011 | CWS | Durham | 224 | Middlesex County, New Haven County |
| Boa Plaza | CT0341363 | NTNCWS | Danbury | 35 | Fairfield County |
| Bolderdash | CT0509123 | NTNCWS | Essex | 25 | Middlesex County |
| Bolles Motors Inc | CT0481033 | NTNCWS | Ellington | 40 | Tolland County |
| Bolton Center School (K-8) | CT0120212 | NTNCWS | Bolton | 756 | Tolland County |
| Bolton High School | CT0120202 | NTNCWS | Bolton | 304 | Tolland County |
| Booth Free School | CT1200042 | NTNCWS | Washington | 130 | Litchfield County |
| Boxwood Condominium Association | CT1051011 | CWS | Jewett City | 28 | New London County |
| Branchville School | CT1180422 | NTNCWS | Ridgefield | 488 | Fairfield County |
| Breezy Knoll Association | CT0878011 | CWS | Norwalk | 100 | Litchfield County |
| Brialee Rv & Tent Park | CT0030114 | NTNCWS | Ashford | 100 | Windham County |
| Bridgewater Commons Condominiums | CT0161011 | CWS | Bridgewater | 51 | Litchfield County |
| Bright Years Academy - Killingworth | CT0709143 | NTNCWS | Cromwell | 64 | Middlesex County |
| Bright Years Academy - Southbury | CT1301113 | NTNCWS | Cromwell | 96 | New Haven County |
| Brightpath - Redding | CT1179113 | NTNCWS | Redding | 180 | Fairfield County |
| Brightpath Madison - East | CT0760064 | NTNCWS | Madison | 63 | New Haven County |
| Brightpath Madison - West | CT0769003 | NTNCWS | Madison | 73 | New Haven County |
| Brookfield High School | CT0181142 | NTNCWS | Brookfield | 995 | Fairfield County |
| Brookfield Hills Condominium Unit Owners | CT0180171 | CWS | Danbury | 144 | Fairfield County |
| Brookfield Housing Authority | CT0184011 | CWS | Brookfield | 37 | Fairfield County |
| Brookfield Office Park Association | CT0180342 | NTNCWS | Danbury | 35 | Fairfield County |
| Brookfield Regional Ymca | CT0189353 | NTNCWS | Brookfied | 100 | Fairfield County |
| Brooklyn Manor | CT0190051 | CWS | Putnam | 30 | Windham County |
| Brooks Plaza | CT0420644 | NTNCWS | Guilford | 67 | Middlesex County |
| Brookscrossing Apartments | CT1121011 | CWS | Putnam | 36 | Windham County |
| Brookside Professional Centre | CT1341172 | NTNCWS | Manchester | 25 | Tolland County |
| Brookview Water Company | CT1180091 | CWS | Ridgefield | 55 | Fairfield County |
| Brookwood Apartments | CT1699011 | CWS | Marblehead | 44 | Windham County |
| Brookwoods Ii | CT0688011 | CWS | Kent | 120 | Litchfield County |
| Brunswick School (Lower & Lower Middle) | CT0579143 | CWS | Greenwich | 567 | Fairfield County |
| Brunswick School (Upper Middle) | CT0579123 | NTNCWS | Greenwich | 295 | Fairfield County |
| Bst Systems, Inc. | CT1090522 | NTNCWS | Plainfield | 75 | Windham County |
| Burlington Academy | CT0209283 | NTNCWS | Burlington | 105 | Hartford County |
| Burnham School | CT0160102 | NTNCWS | Washington | 121 | Litchfield County |
| Burr District Elementary School | CT0610502 | NTNCWS | Killingworth | 364 | Middlesex County |
| C E Murphy School | CT0869033 | NTNCWS | Oakdale | 520 | New London County |
| Cadence Academy | CT0230164 | NTNCWS | Canton | 112 | Hartford County |
| Camp Isabella Freedman | CT0210014 | NTNCWS | Falls Village | 84 | Litchfield County |
| Camp Jewell-Senior | CT0290103 | NTNCWS | Hartford | 500 | Litchfield County |
| Camp Jewell-Sunrise | CT0290113 | NTNCWS | Hartford | 500 | Litchfield County |
| Camp Playland | CT1350013 | NTNCWS | New Canaan | 102 | Fairfield County |
| Campbell Heights Apartments | CT0229031 | CWS | Norwich | 152 | Windham County |
| Candle Hill Mobile Home Park | CT0960151 | CWS | Stamford | 233 | Litchfield County |
| Candlewick Kennels | CT0549073 | NTNCWS | Glastonbury | 28 | Hartford County |
| Candlewood Knolls Water Authority | CT0910591 | CWS | New Fairfield | 524 | Fairfield County |
| Candlewood Lake Shopping Plaza | CT0189483 | NTNCWS | Liverpool | 25 | Fairfield County |
| Candlewood Orchards Property Owners Corp | CT0180181 | CWS | Brookfield | 144 | Fairfield County |
| Candlewood Shores Tax District | CT0180061 | CWS | Bethel | 1,315 | Fairfield County |
| Candlewood Springs Property Owners Assn | CT0960211 | CWS | New Milford | 148 | Litchfield County |
| Candlewood Trails Association, Inc. | CT0960091 | CWS | New Milford | 312 | Litchfield County |
| Canterbury Childrens Academy | CT0229013 | NTNCWS | Canterbury | 59 | Windham County |
| Canterbury Elementary School | CT0220102 | NTNCWS | Canterbury | 350 | Windham County |
| Canton Professional Building | CT0235033 | NTNCWS | Canton | 35 | Hartford County |
| Carefree Homeowners Association | CT0710011 | CWS | Lebanon | 172 | New London County |
| Carriage House Apartments | CT0780181 | CWS | Storrs | 196 | Tolland County |
| Ccarc Inc. | CT0070104 | NTNCWS | New Britain | 125 | Hartford County |
| Cedar Gables Preschool Llc | CT0341263 | NTNCWS | Danbury | 50 | Fairfield County |
| Cedar Terrace Prop Owners Assn | CT0340141 | CWS | Danbury | 66 | Fairfield County |
| Chadwick Homeowners Assn., Inc. | CT1050011 | CWS | Old Lyme | 292 | New London County |
| Change Meadowbrook Manor Inc. | CT0501001 | NTNCWS | Middletown | 25 | Middlesex County |
| Chaplin Elementary School | CT0240233 | NTNCWS | Chaplin | 280 | Windham County |
| Chaplin Woods Condominiums | CT0248011 | CWS | Dayville | 69 | Windham County |
| Chatfield Hill Assn., Inc. | CT1221031 | CWS | Lakeville | 68 | Litchfield County |
| Chatham Acres Elderly Housing | CT0424011 | CWS | East Hampton | 50 | Middlesex County |
| Chatham Apartments | CT0420071 | CWS | Newington | 40 | Middlesex County |
| Chelsea Common Condominium Association | CT0408011 | CWS | Vernon | 126 | Hartford County |
| Cherry Brook School | CT0230392 | NTNCWS | Collinsville | 615 | Hartford County |
| Cheshire United Methodist | CT0259053 | NTNCWS | Cheshire | 25 | New Haven County |
| Chestelm Health & Rehabilitation Center | CT0411061 | CWS | Moodus | 120 | Middlesex County |
| Children'S Village - Boundline | CT1661473 | NTNCWS | Wolcott | 130 | New Haven County |
| Childrens Day School Of Wilton | CT1610202 | NTNCWS | Wilton | 96 | Fairfield County |
| Christ Church | CT0460024 | NTNCWS | Easton | 57 | Fairfield County |
| Christ Episcopal Church | CT1080112 | NTNCWS | Oxford | 34 | New Haven County |
| Classee Water System - Latimer Point | CT1378011 | NTNCWS | Stonington | 316 | New London County |
| Clc Owners Corporation | CT0960071 | CWS | Brookfield | 736 | Fairfield County, Litchfield County |
| Clinton Nurseries - Secondary System | CT1549023 | NTNCWS | Westbrook | 143 | Middlesex County |
| Club House Apartments | CT0780101 | CWS | Storrs | 115 | Tolland County |
| Cobalt Lodge Healthcare & Rehab Center | CT0421011 | CWS | Cobalt | 130 | Middlesex County |
| Colchester Commons | CT0286011 | CWS | Colchester | 224 | New London County |
| Colchester Estates | CT0280041 | CWS | Monsey | 276 | New London County |
| Colebrook Consolidated School | CT0290133 | NTNCWS | Colebrook | 170 | Litchfield County |
| Colonial Center | CT1219103 | NTNCWS | Waterford | 110 | New London County |
| Columbia Ford | CT0300182 | NTNCWS | Putnam | 95 | Tolland County |
| Columbia Manufacturing - Well #1 | CT0309013 | NTNCWS | Columbia | 150 | Tolland County |
| Columbia Manufacturing - Well #2 | CT0309073 | NTNCWS | Columbia | 155 | Tolland County |
| Comcast Cablevision | CT0590253 | NTNCWS | Berlin | 35 | New London County |
| Comcast Corporation | CT0120434 | NTNCWS | Berlin | 25 | Tolland County |
| Comcast Of Ct/Ga/Ma/Nh/Ny/Nc/Va/Vt, Llc | CT1249043 | NTNCWS | Berlin | 75 | New Haven County |
| Community Childrens Center Inc. | CT0787023 | NTNCWS | Storrs | 52 | Tolland County |
| Connecticut Correctional Institute | CT0490031 | CWS | Wethersfield | 2,385 | Hartford County, Tolland County |
| Connecticut Valley Hospital | CT0830021 | CWS | Middletown | 2,928 | Middlesex County |
| Conrads Park | CT0690071 | CWS | Brooklyn | 60 | Windham County |
| Cook Drive Association | CT0120111 | CWS | Bolton | 49 | Tolland County |
| Cornell Hills Assoc, Inc | CT0340181 | CWS | Danbury | 108 | Fairfield County |
| Cornwall Child Center, Inc. | CT0315013 | NTNCWS | West Cornwall | 39 | Litchfield County |
| Cornwall Consolidated School | CT0310052 | NTNCWS | West Cornwall | 202 | Litchfield County |
| Cornwall Water Company | CT0311011 | CWS | Cornwall Bridge | 48 | Litchfield County |
| Country Acres Park | CT0690061 | CWS | Colchester | 48 | Windham County |
| Country Club Of New Canaan | CT0900014 | NTNCWS | New Canaan | 190 | Fairfield County |
| Country Manor | CT1120041 | CWS | Norton | 66 | Windham County |
| Countryside Apartments | CT1662051 | CWS | Okemos | 218 | New Haven County |
| Coventry Grammar School | CT0320302 | NTNCWS | Coventry | 415 | Tolland County |
| Coventry High & Nathan Hale Schools | CT0320292 | NTNCWS | Coventry | 1,252 | Tolland County |
| Coventry Housing Authority-Lower System | CT0320171 | CWS | Coventry | 80 | Tolland County |
| Coventry Housing Authority-Upper System | CT0320181 | CWS | Coventry | 80 | Tolland County |
| Coventry Kids Center | CT0321193 | NTNCWS | Coventry | 80 | Tolland County |
| Cradles To Crayons | CT0410803 | NTNCWS | Moodus | 64 | Middlesex County |
| Cranberry Bog Apartments | CT0690141 | CWS | New York | 72 | Windham County |
| Crestview Condominium Association | CT0251021 | CWS | Enfield | 84 | New Haven County |
| Crystal Lake Condominiums | CT1210021 | CWS | Mystic | 184 | New London County |
| Crystal Lake School | CT0480062 | NTNCWS | Ellington | 275 | Tolland County |
| Ctwc - Amston Lake Division | CT0670331 | CWS | Clinton | 910 | New London County, Tolland County |
| Ctwc - Ashford Park Division | CT0030031 | CWS | Clinton | 334 | Windham County |
| Ctwc - Baker Hill Division | CT0429011 | CWS | Clinton | 203 | Middlesex County |
| Ctwc - Banner Village | CT0410744 | CWS | Clinton | 265 | Middlesex County |
| Ctwc - Bay Mountain | CT0580041 | CWS | Clinton | 440 | New London County |
| Ctwc - Birchwood Heights | CT0780121 | CWS | Clinton | 76 | Tolland County |
| Ctwc - Buckland Road Service Area | CT0779093 | NTNCWS | Clinton | 25 | Hartford County |
| Ctwc - Chimney Hill | CT0529051 | CWS | Clinton | 227 | Hartford County |
| Ctwc - Christ Lutheran Church | CT0670214 | NTNCWS | Clinton | 128 | Tolland County |
| Ctwc - Columbia Heights Div. | CT0300011 | CWS | Clinton | 32 | Tolland County |
| Ctwc - Cornfield Point Div. | CT1698051 | CWS | Clinton | 57 | Windham County |
| Ctwc - Country Mobile Div. | CT0580021 | CWS | Clinton | 186 | New London County |
| Ctwc - Crystal Springs Div. | CT0787011 | CWS | Clinton | 169 | Tolland County |
| Ctwc - Florence Lord (Mash) | CT0791201 | CWS | Clinton | 30 | Hartford County |
| Ctwc - Forest Homes Division | CT0790011 | CWS | Clinton | 100 | Hartford County |
| Ctwc - Gallup System | CT1090031 | CWS | Clinton | 2,538 | Windham County |
| Ctwc - General Water Division | CT0320071 | CWS | Clinton | 306 | Tolland County |
| Ctwc - Green Springs System | CT0760021 | CWS | Clinton | 104 | New Haven County |
| Ctwc - Hebron Center Division | CT0672031 | CWS | Clinton | 1,927 | Tolland County |
| Ctwc - Jensens Beechwood System | CT0700011 | CWS | Clinton | 750 | Middlesex County |
| Ctwc - Lake Hayward | CT0410792 | NTNCWS | Clinton | 650 | Middlesex County |
| Ctwc - Lebanon Elderly Div. | CT0711071 | CWS | Clinton | 67 | New London County |
| Ctwc - Legend Hill System | CT0765101 | CWS | Clinton | 1,368 | New Haven County |
| Ctwc - London Park Division | CT0670011 | CWS | Clinton | 221 | Tolland County |
| Ctwc - Marlborough Gardens | CT0790031 | CWS | Clinton | 110 | Hartford County |
| Ctwc - Northern Reg - Lakewood/Lakeview | CT0320021 | CWS | Clinton | 748 | Tolland County |
| Ctwc - Northern Reg-Llynwood System | CT0120021 | CWS | Clinton | 192 | Tolland County |
| Ctwc - Northern Reg-Nathan Hale System | CT0320031 | CWS | Clinton | 160 | Tolland County |
| Ctwc - Northern Reg-Reservoir Heights | CT1462011 | CWS | Clinton | 62 | Hartford County, Tolland County |
| Ctwc - Pilgrim Hills Division | CT0320041 | CWS | Clinton | 229 | Tolland County |
| Ctwc - Pinewoods Lane Div | CT0780081 | CWS | Clinton | 68 | Tolland County |
| Ctwc - Plainfield System | CT1090081 | CWS | Clinton | 1,713 | Windham County |
| Ctwc - Pompey Hollow Division | CT0030411 | CWS | Clinton | 32 | Windham County |
| Ctwc - Ponemah Village | CT0280071 | CWS | Clinton | 60 | New London County |
| Ctwc - Redwood Farms Division | CT0770041 | CWS | Clinton | 424 | Hartford County |
| Ctwc - Rivercrest Division | CT1130021 | CWS | Clinton | 88 | Middlesex County |
| Ctwc - Riversedge Division | CT1609111 | CWS | Clinton | 179 | Tolland County |
| Ctwc - Sachem Village Condo | CT0792011 | CWS | Clinton | 166 | Hartford County |
| Ctwc - Sdc Water | CT1470011 | CWS | Clinton | 216 | New London County |
| Ctwc - Shoreline Reg-Chester Vllg West | CT0261081 | CWS | Clinton | 216 | Middlesex County |
| Ctwc - Shoreline Region-Masons Island | CT1370051 | CWS | Clinton | 445 | New London County |
| Ctwc - Shoreline Region-Point O Woods | CT1050752 | CWS | Clinton | 1,068 | New London County |
| Ctwc - Shoreline Region-Sound View | CT1050732 | CWS | Clinton | 3,397 | New London County |
| Ctwc - South Coventry System | CT0320051 | CWS | Clinton | 501 | Tolland County |
| Ctwc - Spice Hill Division | CT0428031 | CWS | Clinton | 712 | Middlesex County |
| Ctwc - Thompson System | CT1410011 | CWS | Clinton | 1,070 | Windham County |
| Ctwc - Uconn Depot Div. | CT0787091 | CWS | Clinton | 153 | Middlesex County, Tolland County |
| Ctwc - Uconn Hunting Lodge Div. | CT0787101 | CWS | Clinton | 234 | Tolland County |
| Ctwc - Uconn South Eagleville Div. | CT0787111 | CWS | Clinton | 750 | New London County, Tolland County, Windham County |
| Ctwc - Uconn Willowbrook Div. | CT0787121 | CWS | Clinton | 134 | Middlesex County, Tolland County |
| Ctwc - Wellswood Village Div | CT0672021 | CWS | Clinton | 60 | Tolland County |
| Ctwc - Westchester East | CT0427021 | CWS | Clinton | 153 | Middlesex County |
| Ctwc - Westchester Village | CT0282001 | CWS | Clinton | 252 | New London County |
| Curtis Homestead Village | CT0250233 | NTNCWS | Cheshire | 94 | New Haven County |
| Curtis Packaging | CT0970372 | NTNCWS | Sandy Hook | 180 | Fairfield County |
| Danbury Water Dept-Ridgeview Gardens | CT0340051 | CWS | Danbury | 116 | Fairfield County |
| Darigan-Barr, Inc. | CT1169043 | NTNCWS | Putnam | 89 | Windham County |
| Dartmouth Village Elderly Housing | CT0309051 | CWS | Tolland | 25 | Tolland County |
| Dd Durham | CT0389153 | NTNCWS | Old Saybrook | 156 | Middlesex County |
| Deep Marine Headquarters | CT1059082 | NTNCWS | Portland | 50 | New London County |
| Deer Park Apartments | CT1600071 | CWS | East Hartford | 125 | Tolland County |
| Deer Run Supply | CT0860051 | CWS | New York | 84 | New London County |
| Devereux Glenholme School - Main Campus | CT1501013 | NTNCWS | Washington | 245 | Litchfield County |
| Discovery Zone Learning Cntr Columbia | CT0309133 | NTNCWS | Columbia | 189 | Tolland County |
| Discovery Zone Learning Cntr Marlborough | CT0791162 | NTNCWS | Columbia | 70 | Hartford County |
| Dodge Farm | CT1500321 | CWS | Kent | 42 | Litchfield County |
| Douglas Manor | CT1631031 | CWS | Windham | 135 | Windham County |
| Dr. Helen Baldwin School | CT0221122 | NTNCWS | Canterbury | 310 | Windham County |
| Durham Center Division | CT0380021 | CWS | Durham | 1,601 | Middlesex County |
| Durham Elderly Housing Division | CT0380641 | CWS | Durham | 50 | Middlesex County |
| Durham Lexington Place Division | CT0380651 | CWS | Durham | 45 | Middlesex County |
| East Haddam Elementary School | CT0419013 | NTNCWS | Moodus | 600 | Middlesex County |
| East Haddam Municipal Center | CT0419023 | NTNCWS | Moodus | 154 | Middlesex County |
| East Hampton Community Center | CT0420164 | NTNCWS | East Hampton | 26 | Middlesex County |
| East Hampton High School | CT0420902 | NTNCWS | East Hampton | 568 | Middlesex County |
| East Hampton Mall | CT0420042 | NTNCWS | Farmington | 100 | Middlesex County |
| East Hampton Middle School | CT0420912 | NTNCWS | East Hampton | 487 | Middlesex County |
| East Hampton Wpca - Royal Oaks System | CT0429121 | CWS | East Hampton | 328 | Middlesex County |
| East Hampton Wpca - Village Center | CT0429031 | CWS | East Hampton | 366 | Middlesex County |
| East Windsor Commons, Llc | CT0470052 | NTNCWS | East Windsor | 30 | Hartford County |
| East Windsor Housing Authority | CT0470071 | CWS | Broad Brook | 94 | Hartford County |
| Eastbury School | CT0540202 | NTNCWS | Glastonbury | 280 | Hartford County |
| Eastconn - Danielson | CT0690622 | NTNCWS | North Windham | 87 | Windham County |
| Eastconn Central Administration | CT0631213 | NTNCWS | Hampton | 65 | Windham County |
| Eastconn Columbia | CT0301152 | NTNCWS | Hampton | 60 | Tolland County |
| Eastford Elementary School | CT0390212 | NTNCWS | Eastford | 225 | Windham County |
| Eastport - West | CT1059083 | NTNCWS | Old Lyme | 50 | New London County |
| Eastport - West 2 | CT1059193 | NTNCWS | Old Lyme | 30 | New London County |
| Eastport Ii, Llc | CT1059063 | NTNCWS | Norwich | 30 | New London County |
| Eastport-North | CT1059093 | NTNCWS | Old Lyme | 100 | New London County |
| Eastview Kozley Water Association | CT1420081 | CWS | Tolland | 60 | Tolland County |
| Edgemere Condominium Assn., Inc. | CT0420021 | CWS | East Hampton | 540 | Middlesex County |
| Edward R. Hamilton Bookseller | CT0210013 | NTNCWS | Falls Village | 150 | Litchfield County |
| Eldridge Elderly Housing | CT0878021 | CWS | Morris | 40 | Litchfield County |
| Elisabeth M. Bennet Academy | CT0779083 | NTNCWS | Manchester | 536 | Hartford County |
| Elliot Pratt Education Center | CT0960184 | NTNCWS | New Milford | 50 | Litchfield County |
| Elmbrook Plaza | CT0180914 | NTNCWS | New York | 30 | Fairfield County |
| Elmwood Court, Llc | CT0090114 | CWS | Danbury | 54 | Fairfield County |
| Emmanuel Episcopal Church | CT1570032 | NTNCWS | Weston | 113 | Fairfield County |
| Enchanted Garden - Ethan Allen Hwy | CT1180653 | NTNCWS | Ridgefield | 61 | Fairfield County |
| Essex Gardens | CT0500021 | CWS | Fairfield | 72 | Middlesex County |
| Ethel Walker School | CT1280051 | CWS | Simsbury | 325 | Hartford County |
| Evangelical Christian Center - Main | CT0037001 | CWS | Ashford | 84 | Windham County |
| Evergreen Springs - System #1 | CT0270041 | CWS | Farmington Hills | 45 | Middlesex County |
| Evergreen Springs - System #2 | CT0270091 | CWS | Farmington Hills | 35 | Middlesex County |
| Evergreen Springs - System #3 | CT0270101 | CWS | Farmington Hills | 68 | Middlesex County |
| Evergreen Springs - System #4 | CT0270111 | CWS | Farmington Hills | 110 | Middlesex County |
| Eversource - Newtown Area Work Center | CT0975073 | NTNCWS | Berlin | 145 | Fairfield County |
| Eversource East Hampton Service Center | CT0429023 | NTNCWS | Berlin | 80 | Middlesex County |
| Fairfield Hills | CT0970021 | CWS | Newtown | 2,610 | Fairfield County |
| Fairview Country Club | CT0575023 | NTNCWS | Greenwich | 435 | Fairfield County |
| Fall Brook Mobile Home Park | CT0690051 | CWS | Providence | 98 | Windham County |
| Farmington Club | CT0529053 | NTNCWS | Cheshire | 100 | Hartford County |
| Farmington Line West Condominiums | CT0201011 | CWS | Burlington | 51 | Hartford County |
| Farmingville Elementary School | CT1180412 | NTNCWS | Ridgefield | 428 | Fairfield County |
| Fawn Ridge Association Inc. | CT1699081 | CWS | East Woodstock | 36 | Windham County |
| Fed Ex Ground | CT1600523 | NTNCWS | Willington | 200 | Tolland County |
| Fernwood Rest Home | CT0740301 | CWS | Litchfield | 107 | Litchfield County |
| Fiberoptics Technology (New) | CT1120402 | NTNCWS | Pomfret | 25 | Windham County |
| Fiberoptics Technology (Old) | CT1120443 | NTNCWS | Pomfret | 50 | Windham County |
| First Church Of Christ, Congregational | CT1179123 | NTNCWS | Redding | 50 | Fairfield County |
| First Church Of Round Hill | CT0579043 | NTNCWS | Greenwich | 60 | Fairfield County |
| First Congregational Church Of Lebanon | CT0710054 | NTNCWS | Lebanon | 70 | New London County |
| Foothills Shopping Plaza | CT0920072 | NTNCWS | New Hartford | 60 | Litchfield County |
| Fox Laurel Mobile Home Park, Llc | CT0861111 | CWS | Oakdale | 40 | New London County |
| Foxridge Apartments-Well 1 | CT0051011 | CWS | Staten Island | 25 | Litchfield County |
| Foxridge Apartments-Well 2 | CT0055071 | CWS | Staten Island | 25 | Litchfield County |
| Franklin Academy | CT0418011 | CWS | East Haddam | 81 | Middlesex County |
| Franklin Elementary School | CT0530162 | NTNCWS | North Franklin | 300 | New London County |
| Frederick Brewster School | CT0380482 | NTNCWS | Durham | 370 | Middlesex County |
| Freedom Village Elderly Housing | CT0866301 | CWS | Uncasville | 43 | New London County |
| Frisbie Elementary School | CT1661282 | NTNCWS | Wolcott | 446 | New Haven County |
| Frito-Lay | CT0691203 | NTNCWS | Dayville | 903 | Windham County |
| Frontier Long Distance | CT1620233 | NTNCWS | Windsor | 25 | Litchfield County |
| Garden Lane Apartments | CT0660341 | CWS | Bantam | 40 | Litchfield County |
| George Hersey Robertson School | CT0320312 | NTNCWS | Coventry | 420 | Tolland County |
| George Washington Commons | CT0960224 | NTNCWS | Watertown | 85 | Litchfield County |
| Gilead Hill School | CT0670122 | NTNCWS | Hebron | 391 | Tolland County |
| Glastonbury Vehicle Maint. Garage | CT0540122 | NTNCWS | Glastonbury | 41 | Hartford County |
| Global Self Storage | CT0429133 | NTNCWS | East Hampton | 25 | Middlesex County |
| Golf Performance Center | CT1189514 | NTNCWS | Ridgefield | 25 | Fairfield County |
| Goodspeed Actor Housing - The Village | CT0419211 | CWS | East Haddam | 40 | Middlesex County |
| Goodspeed Opera House | CT0410334 | NTNCWS | East Haddam | 150 | Middlesex County |
| Gorman Road Apartments | CT0199091 | CWS | Dayville | 48 | Windham County |
| Goshen Center School/Town Bldgs | CT0550072 | NTNCWS | Litchfield | 205 | Litchfield County |
| Gqc Well Commission | CT0400041 | CWS | Vernon | 360 | Hartford County |
| Granby Congregational Church | CT0560132 | NTNCWS | Granby | 65 | Hartford County |
| Grant Hill Associates, Inc. | CT0110011 | CWS | Bloomfield | 97 | Hartford County |
| Great Expectations Day Care & Annex | CT1301103 | NTNCWS | Southbury | 125 | New Haven County |
| Great Hill United Methodist Church | CT1249033 | NTNCWS | Oxford | 85 | New Haven County |
| Green Tree Toyota | CT0180384 | NTNCWS | Brookfield | 55 | Fairfield County |
| Green Village | CT0419241 | CWS | Bristol | 65 | Middlesex County |
| Green Village Ii | CT1219141 | CWS | Gales Ferry | 96 | New London County |
| Griswold Mhp Llc | CT0580031 | CWS | Great Neck | 99 | New London County |
| Groszyk Farm Worker Housing | CT0470042 | NTNCWS | Enfield | 46 | Hartford County |
| Groton Board Of Education | CT0590203 | NTNCWS | Mystic | 50 | New London County |
| Groton Long Point Association | CT0590051 | CWS | Groton | 2,400 | New London County |
| Grower Direct Farms Inc | CT1299033 | NTNCWS | Somers | 160 | Tolland County |
| Guilford Veterinary Hospital | CT0609103 | NTNCWS | Guilford | 33 | New Haven County |
| Gyre9 | CT1300472 | NTNCWS | Mahopack | 32 | New Haven County |
| Haddam Killingworth Inter/Middle School | CT0709153 | NTNCWS | Killingworth | 808 | Middlesex County |
| Haddam-Killingworth High School | CT0610563 | NTNCWS | Killingworth | 642 | Middlesex County |
| Hampton Elementary School | CT0631223 | NTNCWS | Hampton | 220 | Windham County |
| Hans Christian Andersen Montessori | CT0120343 | NTNCWS | Bolton | 30 | Tolland County |
| Harmony Acres Mobile Home Park | CT1150031 | CWS | Plainville | 465 | New Haven County |
| Harris Brook Commons | CT1219123 | NTNCWS | Old Saybrook | 60 | New London County |
| Hartland Elem Sch & Town Bldgs | CT0650102 | NTNCWS | Hartland | 300 | Hartford County |
| Hawthorne Terrace Assoc | CT0340151 | CWS | Danbury | 156 | Fairfield County |
| Hazardville - Rye Hill System | CT1299031 | CWS | Enfield | 352 | Tolland County |
| Head O'Meadow Elementary School | CT0975033 | NTNCWS | Newtown | 506 | Fairfield County |
| Hebron Arms Apartments | CT0670041 | CWS | Andover | 39 | Tolland County |
| Hebron Elementary School | CT0670112 | NTNCWS | Hebron | 450 | Tolland County |
| Heritage Cove Condominiums | CT0500011 | CWS | Essex | 208 | Middlesex County |
| Heritage Hill Condominium Assn, Inc | CT1680061 | CWS | Watertown | 120 | Litchfield County |
| Heritage Plaza | CT0915103 | NTNCWS | Hewlett | 54 | Fairfield County |
| High Meadow | CT0614021 | CWS | Tolland | 38 | Middlesex County |
| High Watch Recovery Center | CT0680064 | NTNCWS | Kent | 150 | Litchfield County |
| Hillandale Farm, Ct, Llc | CT0130123 | NTNCWS | Bozrah | 88 | New London County |
| Hillandale Farms (Under The Mountain Rd) | CT0530324 | NTNCWS | Bozrah | 40 | New London County |
| Hillandale Farms Conn, Llc | CT0719033 | NTNCWS | Bozrah | 50 | New London County |
| Hillside Condominiums | CT0670051 | CWS | East Hartford | 96 | Tolland County |
| Hobson Motzer, Inc. | CT0389143 | NTNCWS | Durham | 200 | Middlesex County |
| Hop River Homes | CT0012011 | CWS | Tolland | 26 | Tolland County |
| Hopkins Supply | CT1490011 | NTNCWS | Warren | 77 | Litchfield County |
| Horace Porter School | CT0300062 | NTNCWS | Columbia | 797 | Tolland County |
| Housatonic Valley Regional Hs | CT0210012 | NTNCWS | Falls Village | 750 | Litchfield County |
| Housatonic Valley Waldorf School - White | CT0979333 | NTNCWS | Newtown | 200 | Fairfield County |
| Housatonic Valley Waldorf School Ecc-Red | CT0970462 | NTNCWS | Newtown | 55 | Fairfield County |
| Hubbard Hill Apartments | CT0699231 | CWS | Canterbury | 36 | Windham County |
| Hunting Lodge Apartments | CT0780091 | CWS | New York | 115 | Tolland County |
| Hyponex Corporation - Bagging Plant | CT0719083 | NTNCWS | Lebanon | 85 | New London County |
| Idleview Mobile Home Park | CT0880031 | CWS | Plainville | 138 | New Haven County |
| Incarnation Center, Inc | CT0363023 | NTNCWS | Ivoryton | 42 | Middlesex County |
| Independence Village Elderly Housing | CT0860191 | CWS | Uncasville | 55 | New London County |
| Indian Field Coop Campground Assn., Inc. | CT1219113 | NTNCWS | Salem | 685 | New London County |
| Integrated Illumination Systems | CT0870122 | NTNCWS | Morris | 115 | Litchfield County |
| Ivanhoe Tool & Die Co Inc | CT1410452 | NTNCWS | Thompson | 40 | Windham County |
| Ivy Woods | CT1429201 | CWS | Montvale | 207 | Tolland County |
| James Morris School | CT0870132 | NTNCWS | Litchfield | 258 | Litchfield County |
| Jewett City Water Co-Hill-N-Dale | CT0730021 | CWS | Enfield | 146 | New London County |
| Jewett City Water Co., S & W System | CT0580051 | CWS | Enfield | 320 | New London County |
| Joel Barlow Regional High School | CT1170332 | NTNCWS | Easton | 860 | Fairfield County |
| John Dorr Nature Lab | CT1500052 | NTNCWS | Bronx | 30 | Litchfield County |
| John Lyman School | CT0829013 | NTNCWS | Durham | 285 | Middlesex County |
| John Read Middle School | CT1170342 | NTNCWS | Easton | 430 | Fairfield County |
| John Winthrop Junior High School | CT0360022 | NTNCWS | Deep River | 400 | Middlesex County |
| Johnson Memorial Hospital, Inc | CT1340032 | CWS | Stafford Springs | 250 | Tolland County |
| Jonathan Edwards Winery | CT1021113 | NTNCWS | North Stonington | 25 | New London County |
| Jumbo Apartments | CT1094201 | CWS | Putnam | 35 | Windham County |
| Juniper Club Inc. | CT0110051 | CWS | Bloomfield | 104 | Hartford County |
| Justice Resource Institute, Inc. | CT1419071 | CWS | Needham | 56 | Windham County |
| Kangaroo Korner Childcare Center | CT1539023 | NTNCWS | Watertown | 65 | Litchfield County |
| Keeler Ridgefield B | CT1180322 | NTNCWS | Ridgefield | 30 | Fairfield County |
| Kelly Lane Primary School | CT0560282 | NTNCWS | Granby | 357 | Hartford County |
| Kent School Corp (Valley Campus) | CT0680021 | CWS | Kent | 722 | Litchfield County |
| Kent School Day Care | CT0688103 | NTNCWS | Kent | 50 | Litchfield County |
| Kidds & Co., Llc | CT1021063 | NTNCWS | North Stonington | 78 | New London County |
| Kids In Action, Llc | CT0969223 | NTNCWS | New Milford | 94 | Litchfield County |
| Kids Kingdom Daycare Center | CT1609133 | NTNCWS | Willington | 118 | Tolland County |
| Killingly High School & Agricultural Ctr | CT0691243 | NTNCWS | Dayville | 1,400 | Windham County |
| Killingly Hwy Dept Garage | CT0690272 | NTNCWS | Killingly | 68 | Windham County |
| Killingworth Congregational Church | CT0700114 | NTNCWS | Killingworth | 57 | Middlesex County |
| Killingworth Elementary School | CT0709003 | NTNCWS | Killingworth | 315 | Middlesex County |
| Kindercare Learning Center Inc. | CT0099233 | NTNCWS | Bethel | 157 | Fairfield County |
| Kindercare Learning Corp Of Moodus | CT0419043 | NTNCWS | Moodus | 100 | Middlesex County |
| Kindercare Of Essex | CT0509063 | NTNCWS | Essex | 92 | Middlesex County |
| Kitemaug Orchard Association, Inc. | CT0860041 | CWS | Uncasville | 490 | New London County |
| Knob Hill Condominiums | CT0280051 | CWS | North Haven | 84 | New London County |
| Knollbrook Village Elderly Housing | CT0220191 | CWS | Dayville | 48 | Windham County |
| Knollcrest Tax District | CT0910081 | CWS | New Fairfield | 356 | Fairfield County |
| Knollwood Apartments | CT0780051 | CWS | Storrs | 312 | Tolland County |
| Kugeman Village | CT0311021 | CWS | Sharon | 54 | Litchfield County |
| L.C. Doane Co. | CT0509073 | NTNCWS | Ivoryton | 74 | Middlesex County |
| Lake Garda School | CT0209123 | NTNCWS | Burlington | 715 | Hartford County |
| Lake Hills Village Condominiums | CT1660011 | CWS | Prospect | 102 | Litchfield County, New Haven County |
| Lake Lillinonah Shores Condos | CT0180231 | CWS | Brookfield | 130 | Fairfield County |
| Lake Waubeeka Association | CT0340171 | CWS | Danbury | 712 | Fairfield County |
| Lakeside Manor Apartments | CT0860091 | CWS | Stamford | 72 | New London County |
| Lakeview Estates - Middlefield | CT0827071 | CWS | Middlefield | 85 | Middlesex County |
| Landmark Office Condo Association | CT0189563 | NTNCWS | Brookfield | 35 | Fairfield County |
| Laticrete International | CT0081053 | NTNCWS | Bethany | 200 | New Haven County |
| Laurel Heights Association, Inc. | CT1056231 | CWS | Uncasville | 45 | New London County |
| Laurel Hill Water Association | CT0790041 | CWS | Marlborough | 86 | Hartford County |
| Learn | CT1059073 | NTNCWS | Old Lyme | 53 | New London County |
| Learning Clinic - Applied Arts Bldg | CT0199123 | NTNCWS | Brooklyn | 25 | Windham County |
| Learning Clinic - Brooklyn Bldg | CT0199113 | NTNCWS | Brooklyn | 25 | Windham County |
| Learning Clinic - Overlook Bldg | CT0199103 | NTNCWS | Brooklyn | 30 | Windham County |
| Learning Clinic - Wells B, C, & D | CT0199083 | NTNCWS | Brooklyn | 39 | Windham County |
| Lebanon Elementary School | CT0710212 | NTNCWS | Lebanon | 525 | New London County |
| Lebanon Middle School | CT0719063 | NTNCWS | Lebanon | 415 | New London County |
| Ledyard Wpca - Ledyard Center | CT0727091 | CWS | Ledyard | 3,294 | New London County |
| Ledyard Wpca, Gales Ferry System | CT0727051 | CWS | Ledyard | 2,369 | New London County |
| Leonard J.Tyl Middle School&High School | CT0869073 | NTNCWS | Oakdale | 1,466 | New London County |
| Lillinonah Park Estates Homeowners Assn | CT0960171 | CWS | Bethel | 128 | Litchfield County |
| Lincoln Park Elderly Housing | CT1140021 | CWS | Gales Ferry | 80 | New London County |
| Linemaster Switch Corp | CT1690442 | NTNCWS | Woodstock | 178 | Windham County |
| Lisbon Central School | CT0730122 | NTNCWS | Lisbon | 620 | New London County |
| Lisbon Mobile Homes | CT0730031 | CWS | Southfield | 155 | New London County |
| Litchfield Montessori School | CT0745103 | NTNCWS | Northfield | 120 | Litchfield County |
| Little Bears Adventure Center | CT1130183 | NTNCWS | Portland | 62 | Middlesex County |
| Little Brook Rd Property Owners Assn | CT0920041 | CWS | New Hartford | 64 | Litchfield County |
| Little Learners Children'S Center | CT0869093 | NTNCWS | Oakdale | 70 | New London County |
| Little People'S Play Place | CT0791253 | NTNCWS | Marlborough | 68 | Hartford County |
| Little Rascals Nursery School | CT0340092 | NTNCWS | Danbury | 54 | Fairfield County |
| Little Steps Daycare | CT0859154 | NTNCWS | Monroe | 45 | Fairfield County |
| Little Village Preschool | CT0410194 | NTNCWS | East Haddam | 34 | Middlesex County |
| Lombard Ford | CT0050082 | NTNCWS | Winsted | 35 | Litchfield County |
| Longview Estates, Llc | CT0220011 | CWS | West Haven | 69 | Windham County |
| Loos & Co - Well #1 | CT1120422 | NTNCWS | Pomfret Center | 130 | Windham County |
| Love’S Travel Stop & Country Store | CT1609203 | NTNCWS | Oklahoma City | 130 | Tolland County |
| Lyman Memorial High School | CT0710202 | NTNCWS | Lebanon | 412 | New London County |
| Lyman Orchard Country Farms Complex | CT0829023 | NTNCWS | Middlefield | 84 | Middlesex County |
| Lyme Academy Apartments,Llc | CT1059251 | CWS | Torrington | 48 | New London County |
| Lyme Academy Of Fine Arts | CT1059043 | NTNCWS | Old Lyme | 300 | New London County |
| Lyme Consolidated School | CT0750062 | NTNCWS | Old Lyme | 205 | New London County |
| Lyme Regis, Inc. | CT1050141 | CWS | Lyme | 32 | New London County |
| Lymewood Elderly Housing | CT1056221 | CWS | Old Lyme | 50 | New London County |
| M&M Realty Holdings Llc | CT0709133 | CWS | Durham | 87 | Middlesex County |
| Madison Commons | CT0769133 | NTNCWS | Ridgefield | 28 | New Haven County |
| Mallard Cove Condominium Assn. | CT0427011 | CWS | East Hampton | 177 | Middlesex County |
| Mansfield Elementary School | CT0781233 | NTNCWS | Mansfield | 688 | Tolland County |
| Mansfield Middle School | CT0781243 | NTNCWS | Mansfield | 715 | Tolland County |
| Mansfield Professional Park | CT0780752 | NTNCWS | Storrs | 100 | Tolland County |
| Mansfield Village, Llc | CT0780251 | CWS | Orange | 40 | Tolland County |
| Maplewood-Millbrook Apartments | CT0780161 | CWS | Storrs | 153 | Tolland County |
| Mar-Lea Park Apartments | CT0030061 | CWS | East Hartford | 50 | Windham County |
| Marianapolis Prep School - Admin/School | CT1419053 | NTNCWS | Thompson | 266 | Windham County |
| Marianapolis Prep School - St Alberts | CT1419081 | CWS | Thompson | 51 | Windham County |
| Marianapolis Prep School - St Johns | CT1410051 | CWS | Thompson | 128 | Windham County |
| Marina Cove | CT0860141 | CWS | Uncasville | 70 | New London County |
| Markham Meadows Campground-Well #2 | CT0421041 | NTNCWS | East Hampton | 120 | Middlesex County |
| Marlborough Congregational Church | CT0790142 | NTNCWS | Marlborough | 97 | Hartford County |
| Marlborough Health Care Center, Inc | CT0791001 | CWS | Marlborough | 165 | Hartford County |
| Masonic Temple Assn Of East Hampton | CT0429113 | NTNCWS | East Hampton | 75 | Middlesex County |
| Matulaitis Nursing Home | CT1160021 | CWS | Putnam | 254 | Windham County |
| Mayflower Inn | CT1500182 | NTNCWS | Washington | 109 | Litchfield County |
| Mayflower Spa | CT1501143 | NTNCWS | Washington | 72 | Litchfield County |
| Mcdonalds Of East Hampton | CT0420374 | NTNCWS | East Hampton | 25 | Middlesex County |
| Mcmullin Manufacturing Corporation | CT0180694 | NTNCWS | Brookfield | 33 | Fairfield County |
| Meadowbrook Shopping Center | CT0321172 | NTNCWS | Manchester | 40 | Tolland County |
| Meadows Apartments | CT0861021 | CWS | Canterbury | 301 | New London County |
| Medtronic Xomed (Merocel Facility) | CT0590154 | NTNCWS | Mystic | 50 | New London County |
| Melissa Jones School | CT0609073 | NTNCWS | Guilford | 484 | New Haven County |
| Meriden Care Center Llc-Silver Springs | CT0807021 | CWS | Meriden | 334 | New Haven County |
| Metacomet Homes-Well 1 And Well 2 | CT0400061 | CWS | Suffield | 63 | Hartford County |
| Metallon Inc | CT1400112 | NTNCWS | Thomaston | 49 | Litchfield County |
| Middlebury Commons | CT0815051 | CWS | Middlebury | 76 | New Haven County |
| Middlebury Elementary School | CT0819013 | NTNCWS | Middlebury | 412 | New Haven County |
| Middlefield Housing Authority | CT0820031 | CWS | Rockfall | 62 | Middlesex County |
| Mile Creek Apartments | CT1050131 | CWS | Old Lyme | 60 | New London County |
| Miss Merry Mac'S Daycare | CT1420012 | NTNCWS | Tolland | 64 | Tolland County |
| Mitchell Associates | CT1320042 | NTNCWS | South Windsor | 30 | Hartford County |
| Mohegan Sun Cc Pautipaug - Clubhouse | CT1331033 | NTNCWS | Uncasville | 40 | New London County |
| Montessori Discovery School | CT1041013 | NTNCWS | Norwich | 88 | New London County |
| Montville Water Supply | CT0864011 | CWS | Uncasville | 1,300 | New London County |
| Moosup Garden Apartments | CT1090221 | CWS | Weatogue | 270 | Windham County |
| Moosup Manor | CT1099131 | CWS | Dayville | 27 | Windham County |
| Moosup Pond Terrace, Llc | CT1099181 | CWS | Farmington | 46 | Windham County |
| Mount Hope Montessori School | CT0780122 | NTNCWS | Mansfield Center | 88 | Tolland County |
| Mountain Laurel Plaza, Well 1 | CT0090344 | NTNCWS | Danbury | 55 | Fairfield County |
| Mountain Laurel Plaza, Well 2 | CT0099143 | NTNCWS | Danbury | 50 | Fairfield County |
| Mountainside Lodge | CT1000124 | NTNCWS | Canaan | 111 | Litchfield County |
| Mountainside Treatment Center | CT1000233 | NTNCWS | Canaan | 80 | Litchfield County |
| Mountview Apartments | CT0861051 | CWS | Monsey | 105 | New London County |
| Munson'S Candy Kitchen | CT0121023 | NTNCWS | Bolton | 30 | Tolland County |
| Mystic Business Park, Llc | CT0598063 | NTNCWS | Mystic | 225 | New London County |
| Mystic Village Apartments | CT0590071 | CWS | Mystic | 66 | New London County |
| Nathan Hale-Ray High School | CT0419073 | NTNCWS | Moodus | 461 | Middlesex County |
| Nathan Hale-Ray Middle School | CT0419193 | NTNCWS | Moodus | 620 | Middlesex County |
| Natural Park Apartments | CT1600101 | CWS | South Hadley | 60 | Tolland County |
| Neighbors Of Rogers, Llc | CT0597021 | CWS | Mystic | 57 | New London County |
| Nelson'S Court | CT0429223 | NTNCWS | East Hampton | 37 | Middlesex County |
| Network, Inc. | CT0011103 | NTNCWS | Vernon | 77 | Tolland County |
| New England Laborers Academy - Main Sys | CT1120392 | NTNCWS | Pomfret Center | 151 | Windham County |
| New Fairfield Elementary School | CT0915053 | NTNCWS | New Fairfield | 1,425 | Fairfield County |
| New Fairfield High/Middle School | CT0910532 | NTNCWS | New Fairfield | 1,400 | Fairfield County |
| New Life Church - South Ridge Complex | CT0800024 | NTNCWS | Wallingford | 122 | New Haven County |
| New Preston Water Co | CT1500011 | CWS | New Preston | 139 | Litchfield County |
| Newington Va Medical Center-Building 1 | CT0949053 | NTNCWS | Newington | 110 | Hartford County |
| Newington Va Medical Center-Building 2C | CT0949063 | NTNCWS | Newington | 80 | Hartford County |
| Newington Va Medical Center-Building 2E | CT0949073 | NTNCWS | Newington | 335 | Hartford County |
| Newport Academy (Double Hill) | CT0105073 | NTNCWS | Watertown | 50 | Litchfield County |
| Newport Academy (Todd Hill) | CT0105083 | NTNCWS | Watertown | 75 | Litchfield County |
| Noank Fire District | CT0590031 | CWS | Noank | 1,947 | New London County |
| Nod Hill Brewery | CT1180362 | NTNCWS | Ridgefield | 60 | Fairfield County |
| Nonnewaug High School | CT1680112 | NTNCWS | Woodbury | 887 | New Haven County |
| Norfield Congregational Church | CT1570042 | NTNCWS | Weston | 81 | Fairfield County |
| North Guilford Congregational Church | CT0609053 | NTNCWS | Guilford | 40 | New Haven County |
| North Madison Congregational Church | CT0769143 | NTNCWS | Madison | 35 | New Haven County |
| North Madison Shopping Center | CT0769053 | NTNCWS | Trumbull | 60 | New Haven County |
| North Purchase Elderly Housing | CT0100011 | CWS | Bethlehem | 72 | Litchfield County |
| North Stonington Christian Academy | CT1021031 | NTNCWS | North Stonington | 78 | New London County |
| North Willington Village Condo Assoc. | CT1600061 | CWS | Willington | 66 | Tolland County |
| North Windham Elementary School | CT1631182 | NTNCWS | Willimantic | 485 | Windham County |
| Northfield Commons Association | CT1291152 | NTNCWS | Somers | 80 | Tolland County |
| Northford Glen Condominium Association | CT0990031 | CWS | Wallingford | 84 | New Haven County |
| Northstone Gardens | CT1021001 | CWS | Stamford | 79 | New London County |
| Northwood Childcare | CT1699043 | NTNCWS | Woodstock | 32 | Windham County |
| Novanta Ims | CT0790134 | NTNCWS | Marlborough | 50 | Hartford County |
| Numa Tool Co Inc | CT1410442 | NTNCWS | Thompson | 80 | Windham County |
| Nutmeg Container Corporation | CT1410432 | NTNCWS | North Haven | 50 | Windham County |
| Oak Grove Montessori School | CT0781263 | NTNCWS | Mansfield Center | 77 | Tolland County |
| Oak Grove Senior Housing Corp | CT0413011 | CWS | Tolland | 72 | Middlesex County |
| Oakdale Manor Water Association | CT1300071 | CWS | Southbury | 40 | New Haven County |
| Oakridge Gardens, Llc | CT0860171 | CWS | West Mystic | 70 | New London County |
| Oakridge Village | CT0860211 | CWS | Forest Hills | 33 | New London County |
| Old Farms Condominium Association Inc | CT0960191 | CWS | New Milford | 285 | Litchfield County |
| Old Indian Trail | CT0820501 | CWS | Middlefield | 32 | Middlesex County |
| Old Lyme Childrens Learning Center, Inc | CT1059103 | NTNCWS | Old Lyme | 50 | New London County |
| Old Lyme Marketplace | CT1059013 | NTNCWS | Framingham | 70 | New London County |
| Old Lyme Shopping Center | CT1059023 | NTNCWS | Yonkers | 100 | New London County |
| Old Newgate Ridge Water Company Inc | CT0400051 | CWS | East Hartland | 208 | Hartford County |
| Orchard Acres Association | CT0780061 | CWS | East Hartford | 176 | Tolland County |
| Orchard Hill Association | CT0110041 | CWS | Bloomfield | 30 | Hartford County |
| Orchard Park Ind. Area - 50 Mungertown | CT0769123 | NTNCWS | Madison | 40 | New Haven County |
| Pachaug Marina Campground | CT0580072 | NTNCWS | New London | 310 | New London County |
| Parish Hill High School | CT0241243 | NTNCWS | Chaplin | 487 | Windham County |
| Parkway School | CT0570212 | NTNCWS | Greenwich | 275 | Fairfield County |
| Peake Brook Llc | CT1691163 | NTNCWS | Woodstock | 208 | Windham County |
| Pequot Ledge Campground | CT0865032 | NTNCWS | Oakdale | 231 | New London County |
| Perkins Corner | CT0781192 | NTNCWS | Windham | 45 | Tolland County |
| Perry Hill Estates Apartments Inc. | CT0030021 | CWS | East Hartford | 144 | Windham County |
| Phelps Crossing Commercial | CT1600503 | NTNCWS | South Windsor | 50 | Tolland County |
| Photronics, Inc. Building 1 | CT0189973 | NTNCWS | Brookfield | 110 | Fairfield County |
| Photronics, Inc. Building 2 | CT0189983 | NTNCWS | Brookfield | 110 | Fairfield County |
| Pine Grove Association, Inc. | CT0210091 | NTNCWS | Arlington | 248 | Litchfield County |
| Pine Point School-Campbell | CT1370393 | NTNCWS | Stonington | 267 | New London County |
| Pine Point School-Mitchell | CT1370403 | NTNCWS | Stonington | 267 | New London County |
| Pinecrest Condominiums | CT1698041 | CWS | Berlin | 110 | Windham County |
| Plaza Shopping Center | CT0670352 | NTNCWS | Hebron | 80 | Tolland County |
| Pleasant Valley Shopping Plaza | CT1085033 | NTNCWS | Stratford | 89 | New Haven County |
| Pomfret Community School | CT1120322 | NTNCWS | Pomfret Center | 500 | Windham County |
| Pomfret School | CT1120051 | CWS | Pomfret | 400 | Windham County |
| Powder Ridge Ski Lodge-Main Bldg | CT0820051 | NTNCWS | Portland | 100 | Middlesex County |
| Pratt & Whitney | CT0830032 | NTNCWS | Middletown | 2,800 | Middlesex County |
| Precious Memories Daycare Center | CT0598033 | NTNCWS | Mystic | 169 | New London County |
| Preston Plains Water Company | CT1140011 | CWS | Mashantucket | 550 | New London County |
| Preston Veterans Memorial School | CT1149033 | NTNCWS | Preston | 500 | New London County |
| Prides Corner Farmhouse, Inc. | CT0719073 | NTNCWS | Lebanon | 50 | New London County |
| Prides Corner- Jaderloon/Propagation | CT0719113 | NTNCWS | Lebanon | 40 | New London County |
| Pumpkin Patch Daycare | CT1549003 | NTNCWS | Westbrook | 105 | Middlesex County |
| Putnam Chrysler Dodge Jeep | CT1169023 | NTNCWS | Putnam | 30 | Windham County |
| Putnam Preschool And Childcare, Llc. | CT1160013 | NTNCWS | Putnam | 36 | Windham County |
| Quality Daycare & Co-Op Nursery | CT1219023 | NTNCWS | Salem | 60 | New London County |
| Quality Name Plate | CT0540172 | NTNCWS | Glastonbury | 85 | Hartford County |
| Quassuk Heights Condominium Assn | CT1680041 | CWS | Woodbury | 108 | Litchfield County |
| Quinebaug Mobile Home Park | CT1411041 | CWS | Quinebaug | 205 | Windham County |
| Quinlan Enterprise Building | CT1021103 | NTNCWS | Stonington | 46 | New London County |
| Quonnipaug Hills - Main System | CT0600041 | CWS | Branford | 564 | New Haven County |
| Quonnipaug Hills - Section I | CT0606011 | CWS | Branford | 27 | New Haven County |
| Red Balloon Daycare | CT1341192 | NTNCWS | Stafford | 55 | Tolland County |
| Red Sneakers | CT0710283 | NTNCWS | Lebanon | 34 | New London County |
| Redding Country Club | CT1170174 | NTNCWS | Redding | 115 | Fairfield County |
| Redding Elementary School | CT1170352 | NTNCWS | Easton | 811 | Fairfield County |
| Region 18 Schools - Lyme Street | CT1050492 | NTNCWS | Old Lyme | 1,102 | New London County |
| Renwood Apartments | CT0780171 | CWS | Chestnut Ridge | 190 | Tolland County |
| Reynolds Subaru | CT0750123 | NTNCWS | Lyme | 70 | New London County |
| Ridgefield High And Middle School | CT1180382 | NTNCWS | Ridgefield | 2,575 | Fairfield County |
| Ridgeview Heights | CT1600051 | CWS | East Hartford | 96 | Tolland County |
| Ridgewood Hills Association System 1 | CT0361011 | CWS | Killingworth | 36 | Middlesex County |
| Riverview Farm Seabird Enterprises | CT0869143 | NTNCWS | Groton | 50 | New London County |
| Rockrimmon Country Club | CT1350042 | NTNCWS | Stamford | 60 | Fairfield County |
| Rocktree Apartments | CT0050011 | CWS | Wilton | 60 | Litchfield County |
| Rocky Glen Mill | CT0979113 | NTNCWS | Newtown | 70 | Fairfield County |
| Rocky River Business & Professional Ctr | CT0969263 | NTNCWS | New Milford | 30 | Litchfield County |
| Rogers Corp - Poron Well | CT1690432 | NTNCWS | Rogers | 90 | Windham County |
| Rogers Corp - Rogers Well | CT0691102 | NTNCWS | Rogers | 250 | Windham County |
| Rolling Hills Country Club | CT1615083 | NTNCWS | Wilton | 100 | Fairfield County |
| Roseland Terrace Association, Inc. | CT1690021 | CWS | Woodstock | 100 | Windham County |
| Ross Hill Park Campground | CT0730182 | NTNCWS | Winchester | 100 | New London County |
| Roto Frank Of America | CT0261053 | NTNCWS | Chester | 70 | Middlesex County |
| Round Hill Community Church | CT0570142 | NTNCWS | Greenwich | 25 | Fairfield County |
| Round Hill Llc - Well# 1&2 | CT0731021 | CWS | Griswold | 72 | New London County, Windham County |
| Rumsey Hall School | CT1501111 | CWS | Washington | 398 | Litchfield County |
| Rye Field Manor Elderly Housing | CT1056241 | CWS | East Lyme | 78 | New London County |
| Safe Harbor, Inc. | CT1548011 | CWS | Hartford | 50 | Middlesex County |
| Salem Elementary School | CT1219013 | NTNCWS | Salem | 675 | New London County |
| Salem Manor Condominiums, System #1 | CT1210011 | CWS | Niantic | 32 | New London County |
| Salem Manor Condominiums, System #2 | CT1219111 | CWS | Niantic | 25 | New London County |
| Salem Marketplace | CT1219083 | NTNCWS | Salem | 200 | New London County |
| Salem Town Center Llc | CT1219093 | NTNCWS | Bronx | 30 | New London County |
| Salisbury School | CT1220061 | CWS | Salisbury | 520 | Litchfield County |
| Salmon Brook District Water Dept | CT0560011 | CWS | Granby | 2,151 | Hartford County |
| School Hill Association, Inc. | CT0470021 | CWS | Broad Brook | 77 | Hartford County |
| Scotland Elementary School | CT1230092 | NTNCWS | Scotland | 200 | Windham County |
| Scott Electrokrafts | CT0010094 | NTNCWS | Andover | 45 | Tolland County |
| Scwa, Barrett Division (Bar) | CT0720011 | CWS | Gales Ferry | 300 | New London County |
| Scwa, Birchwood Division (Bwd) | CT0869011 | CWS | Gales Ferry | 108 | New London County |
| Scwa, Cedar Ridge Division | CT1020011 | CWS | Gales Ferry | 370 | New London County |
| Scwa, Chesterfield Division | CT0860081 | CWS | Gales Ferry | 524 | New London County |
| Scwa, Chriswood Division (Cwd) | CT0727031 | CWS | Gales Ferry | 164 | New London County |
| Scwa, Hillcrest Division (Hlc) | CT0860131 | CWS | Gales Ferry | 450 | New London County |
| Scwa, Ledyard Center Division | CT0720313 | CWS | Gales Ferry | 652 | New London County |
| Scwa, Mohegan Division | CT0860021 | CWS | Gales Ferry | 1,428 | New London County |
| Scwa, Montville Division (Mtv) | CT0860011 | CWS | Gales Ferry | 2,570 | New London County |
| Scwa, North Stonington Division (Nst) | CT1020021 | CWS | Gales Ferry | 1,860 | New London County |
| Scwa, Oakdale Heights Division | CT0860031 | CWS | Gales Ferry | 876 | New London County |
| Scwa, Robin Hill Division (Rbn) | CT0867101 | CWS | Gales Ferry | 388 | New London County |
| Scwa, Seven Oaks (Oak) | CT0869121 | CWS | Gales Ferry | 26 | New London County |
| Scwa, Tower-Ferry View Division | CT0720041 | CWS | Gales Ferry | 2,567 | New London County |
| Second Baptist Church | CT1020314 | NTNCWS | North Stonington | 70 | New London County |
| Seely - Brown Village | CT1121131 | CWS | Pomfret Center | 48 | Windham County |
| Shady Acres Mobile Home Park | CT0347031 | CWS | New York | 117 | Fairfield County |
| Shady Glen Restaurant | CT0770072 | NTNCWS | Manchester | 30 | Hartford County |
| Shaker Heights Water Company | CT0490041 | CWS | Enfield | 172 | Hartford County |
| Sharon Heights Water Association | CT0110031 | CWS | Bloomfield | 51 | Hartford County |
| Sharon Ridge Apartments | CT1250021 | CWS | Sharon | 62 | Litchfield County |
| Sharon Water & Sewer Commission | CT1250011 | CWS | Sharon | 803 | Litchfield County |
| Shepaug Middle/High School | CT1500102 | NTNCWS | Washington | 770 | Litchfield County |
| Sherman Elementary School | CT1270132 | NTNCWS | Sherman | 430 | Fairfield County |
| Sherman Green Marketplace | CT1270214 | NTNCWS | New Milford | 79 | Fairfield County |
| Silvermine Road Water System | CT0189013 | NTNCWS | Brookfield | 50 | Fairfield County |
| Simoniz Usa | CT0120302 | NTNCWS | Bolton | 30 | Tolland County |
| Smt Corporation | CT0975143 | NTNCWS | Sandy Hook | 73 | Fairfield County |
| Snug Harbor Development Corp | CT0340231 | CWS | Danbury | 144 | Fairfield County |
| Sofia'S Plazas Ii/Iii | CT0473023 | NTNCWS | East Windsor | 40 | Hartford County |
| Solair Recreational League - Lower Ridge | CT1699061 | NTNCWS | Woodstock | 150 | Windham County |
| Solair Recreational League - Pavilion | CT1699053 | NTNCWS | Woodstock | 93 | Windham County |
| Solano Inn Llc | CT1130064 | CWS | Portland | 96 | Middlesex County |
| South Broad Street Service Area | CT1489033 | NTNCWS | Wallingford | 250 | New Haven County |
| South Kent School | CT0680082 | CWS | South Kent | 228 | Litchfield County |
| South Shore Landing | CT1050344 | NTNCWS | Old Lyme | 82 | New London County |
| Southbury Training School | CT1300011 | CWS | Southbury | 816 | New Haven County |
| Southford Center | CT1300204 | NTNCWS | Cheshire | 27 | New Haven County |
| Southford Retail Center | CT1301133 | NTNCWS | Shelton | 25 | New Haven County |
| Southridge Park Apartments | CT0120031 | CWS | Bolton | 50 | Tolland County |
| Sprague Water & Sewer Authority | CT1330021 | CWS | Baltic | 1,058 | New London County |
| St Francis Church | CT1350182 | NTNCWS | Stamford | 70 | Fairfield County |
| St Ignatius Retreat & Christ King Church | CT1180374 | NTNCWS | Ridgefield | 105 | Fairfield County |
| St Lukes School | CT0900072 | NTNCWS | New Canaan | 405 | Fairfield County |
| St Lukes School Athletic Center | CT0900133 | NTNCWS | New Canaan | 500 | Fairfield County |
| St. Andrews Episcopal Church | CT0769173 | NTNCWS | Madison | 40 | New Haven County |
| St. Bernard School | CT0860282 | NTNCWS | Uncasville | 950 | New London County |
| St. Francis Of Assisi R.C. Church | CT1570074 | NTNCWS | Weston | 80 | Fairfield County |
| St. Thomas More School-Main System | CT0861251 | CWS | Oakdale | 270 | New London County |
| St. Thomas More School-The Cove | CT0868011 | CWS | Oakdale | 25 | New London County |
| Stafford Hollow Water Association | CT1341303 | CWS | Stafford | 429 | Tolland County |
| Stanwich Club | CT0570164 | NTNCWS | Greenwich | 130 | Fairfield County |
| State Police Barracks Troop C | CT1429163 | NTNCWS | Middletown | 70 | Tolland County |
| State Police Barracks Troop E | CT0860642 | NTNCWS | Middletown | 70 | New London County |
| State Police Barracks Troop I | CT0080052 | NTNCWS | Middletown | 25 | New Haven County |
| Stepping Stones Educational Center | CT0235063 | NTNCWS | Canton | 95 | Hartford County |
| Sterling Water System | CT1360011 | CWS | Oneco | 308 | Windham County |
| Stone Bridge Center For Health & Rehab | CT0971011 | CWS | Newtown | 504 | Fairfield County |
| Stony Hill Village Condominium Assn | CT0180251 | CWS | Danbury | 392 | Fairfield County |
| Strawberry Park | CT1140471 | NTNCWS | Salt Springs | 1,047 | New London County |
| Sts Cyril&Methodius Serbian Orth. Church | CT0820362 | NTNCWS | Middlefield | 53 | Middlesex County |
| Summer Hill Nurseries | CT0760104 | NTNCWS | Madison | 50 | New Haven County |
| Sunny Valley Tax District | CT0960031 | CWS | New Milford | 500 | Litchfield County |
| Sunny Waters Mobile Home Park | CT1040091 | CWS | Gales Ferry | 303 | New London County |
| Sunset Apartments Llc | CT0120041 | CWS | Bolton | 46 | Tolland County |
| Surreybrook School | CT0081114 | NTNCWS | Bethany | 105 | New Haven County |
| Sutton Land, Llc | CT0570262 | NTNCWS | Greenwich | 150 | Fairfield County |
| Sylvan Ridge Condominiums | CT0826061 | CWS | Middlefield | 84 | Middlesex County |
| Ta Travel Plaza | CT1600513 | NTNCWS | Wanatah | 130 | Tolland County |
| Talcott Mountain Science Center #1 | CT0040442 | NTNCWS | Avon | 59 | Hartford County |
| Talcott Mountain Science Center #2 | CT0040483 | NTNCWS | Avon | 59 | Hartford County |
| Tamarack Country Club | CT0570184 | NTNCWS | Greenwich | 130 | Fairfield County |
| Tamarack Lodge & Glamping Resort Ct | CT1470084 | NTNCWS | Voluntown | 55 | New London County |
| Tariffville Fire District Water Dept | CT1280011 | CWS | Tariffville | 1,477 | Hartford County |
| Tashua Village Association, Inc. | CT1440021 | CWS | Trumbull | 35 | Fairfield County |
| Temple Shalom | CT1030074 | NTNCWS | Norwalk | 100 | Fairfield County |
| The Arc Of The Farmington Valley | CT0040493 | NTNCWS | Canton | 50 | Hartford County |
| The Caring Community Of Ct, Inc. | CT0286013 | NTNCWS | Colchester | 90 | New London County |
| The Carlyle Johnson Machine Company | CT0120424 | NTNCWS | Bolton | 42 | Tolland County |
| The Carrot Patch | CT0620183 | NTNCWS | Hamden | 52 | New Haven County |
| The Country School (Main Building) | CT0769093 | NTNCWS | Madison | 360 | New Haven County |
| The Country School (Steam Bldg Well #2) | CT0769214 | NTNCWS | Madison | 30 | New Haven County |
| The Diversified Group | CT0791152 | NTNCWS | Marlborough | 65 | Hartford County |
| The Frederick Gunn School, Inc. | CT1500051 | CWS | Washington | 300 | Litchfield County |
| The Grumman Hill Montessori Association | CT1615113 | NTNCWS | Wilton | 259 | Fairfield County |
| The Independent Day School | CT0820382 | NTNCWS | Middlefield | 199 | Middlesex County |
| The Learning Center, Inc. | CT1320243 | NTNCWS | South Windsor | 61 | Hartford County |
| The Learning Den | CT0240262 | NTNCWS | West Hartford | 55 | Windham County |
| The Marvelwood School | CT0680031 | CWS | Kent | 220 | Litchfield County |
| The Masters School | CT1280212 | NTNCWS | West Simsbury | 372 | Hartford County |
| The Owls Nest Day School | CT1129083 | NTNCWS | Pomfret Center | 38 | Windham County |
| The Rectory School | CT1120061 | CWS | Promfret | 300 | Windham County |
| The Rogers Manufacturing Company | CT0820072 | NTNCWS | Rockfall | 100 | Middlesex County |
| The Scotts-Hyponex Company-Main Plant | CT0719053 | NTNCWS | Lebanon | 45 | New London County |
| The Wellspring Foundation, Inc. | CT0105023 | NTNCWS | Bethlehem | 63 | Litchfield County |
| The Weston Field Club - Well #1 | CT1570112 | NTNCWS | Weston | 291 | Fairfield County |
| The Weston Field Club - Well #2 | CT1570084 | NTNCWS | Weston | 75 | Fairfield County |
| Theater Square | CT0429153 | NTNCWS | Newington | 25 | Middlesex County |
| Thompson Hill Water Co - Beechwood Acres | CT0867071 | CWS | Thompson | 77 | New London County |
| Thompson Hill Water Co - Paula Lane Div | CT1410661 | CWS | Thompson | 85 | Windham County |
| Tilcon Connecticut Inc. - North Branford | CT0999043 | NTNCWS | New Britain | 38 | New Haven County |
| Tilcon Connecticut Inc. - Wallingford | CT1489013 | NTNCWS | New Britain | 30 | Hartford County, Middlesex County, New Haven County |
| Tinaco Plaza, Llc | CT1020092 | NTNCWS | N Stonington | 25 | New London County |
| Todays Plaza, Llc | CT0600044 | NTNCWS | Guilford | 54 | New Haven County |
| Tolland Professional Center | CT1429183 | NTNCWS | Tolland | 26 | Tolland County |
| Tolland Water Department | CT1423011 | CWS | Tolland | 1,251 | Tolland County |
| Tolland Water Dept - Torry Road | CT1429191 | CWS | Tolland | 204 | Tolland County |
| Torrington Country Club | CT0550274 | NTNCWS | Goshen | 280 | Litchfield County |
| Touchstone N.A.F.I. | CT0745093 | CWS | Litchfield | 43 | Litchfield County |
| Town In Country Condominiums - Lower Sys | CT1686091 | CWS | Naugatuck | 120 | Litchfield County |
| Town In Country Condominiums - Upper Sys | CT1680021 | CWS | Naugatuck | 120 | Litchfield County |
| Town Of Canaan (Daycare) | CT0210023 | NTNCWS | Falls Village | 30 | Litchfield County |
| Tri-Town Shopping Plaza | CT0280042 | NTNCWS | East Hartford | 82 | New London County |
| Ttm Printed Circuit - 15 Industrial Dr | CT1341243 | NTNCWS | Stafford | 120 | Tolland County |
| Ttm Printed Circuit - 228 Upper Road | CT1341253 | NTNCWS | Stafford | 150 | Tolland County |
| Ttm Printed Circuit - Building 3A Annex | CT1341344 | NTNCWS | Stafford | 26 | Tolland County |
| Ttm Printed Circuit - Building 4 | CT1341363 | NTNCWS | Stafford | 26 | Tolland County |
| Ttm Printed Circuit - Building 5 | CT1341343 | NTNCWS | Stafford | 51 | Tolland County |
| Ttm Technologies, Inc - Building 6 | CT1341373 | NTNCWS | Stafford | 26 | Tolland County |
| Tulli'S Tap House At River Ridge | CT0580084 | NTNCWS | Griswold | 50 | New London County |
| Tunnel Hill Mobile Home Park | CT0731011 | CWS | Southfield | 40 | New London County |
| Turkey Hill Of East Granby, Llc | CT0400031 | CWS | East Granby | 360 | Hartford County |
| Turnberry Realty, Llc | CT0979403 | NTNCWS | Brooklyn | 123 | Fairfield County |
| Twelve Inspiration Lane, Llc | CT0261043 | NTNCWS | Chester | 68 | Middlesex County |
| Twin Hills Water District | CT0320061 | CWS | Bolton | 156 | Tolland County |
| Twin Maples Nursing Home | CT0381011 | CWS | Durham | 100 | Middlesex County |
| Tyrrell Middle School | CT1661262 | NTNCWS | Wolcott | 454 | New Haven County |
| U.S. Department Of Agriculture - Tolland | CT1429133 | NTNCWS | Tolland | 36 | Tolland County |
| Ullman Devices (Main Building) | CT1180342 | NTNCWS | Ridgefield | 30 | Fairfield County |
| Union Elementary School | CT1450112 | NTNCWS | Union | 80 | Tolland County |
| United Congregational Church | CT1030183 | NTNCWS | Norwalk | 61 | Fairfield County |
| Valley Regional High School | CT0360012 | NTNCWS | Deep River | 565 | Middlesex County |
| Vernon Village Inc. | CT1463011 | CWS | Vernon | 430 | Hartford County, Tolland County |
| Village At Crystal Springs | CT1429171 | CWS | Tolland | 25 | Tolland County |
| Village Hill Apartments | CT0711001 | CWS | Willimantic | 36 | New London County |
| Village Market Place | CT0550321 | CWS | Goshen | 462 | Litchfield County |
| Village Shopping Center | CT0610564 | NTNCWS | Higganum | 75 | Middlesex County |
| Village Square | CT0810294 | NTNCWS | Lynnfield | 50 | New Haven County |
| Voluntown Elementary School | CT1479013 | NTNCWS | Voluntown | 365 | New London County |
| Voluntown Housing Authority | CT1479021 | CWS | Voluntown | 42 | New London County |
| Walden Apartments | CT1600041 | CWS | Willington | 276 | Tolland County |
| Warren Congregational Church | CT1490024 | NTNCWS | Warren | 54 | Litchfield County |
| Warren Elementary School | CT1490102 | NTNCWS | Litchfield | 140 | Litchfield County |
| Washington Montessori School | CT1500343 | NTNCWS | New Preston | 350 | Litchfield County |
| Washington Primary School | CT1500312 | NTNCWS | Washington | 247 | Litchfield County |
| Waterford Country School, Inc. | CT1520061 | CWS | Quaker Hill | 180 | New London County |
| Watertown Water & Sewer - Westgate | CT1539031 | CWS | Oakville | 600 | Litchfield County |
| Waterview Business Park | CT0869083 | NTNCWS | Stonington | 176 | New London County |
| Wells Road Intermediate School | CT0560372 | NTNCWS | Granby | 405 | Hartford County |
| Wellspring Foundation - Shiloah | CT0105053 | NTNCWS | Bethlehem | 27 | Litchfield County |
| Wellswood Estates Foundation, Inc. | CT0671021 | CWS | Willimantic | 112 | Tolland County |
| West Hill Lake Water Assoc. | CT0920281 | NTNCWS | Canton | 276 | Litchfield County |
| Westchester Hills Condominium Assn. | CT0280031 | CWS | Mystic | 225 | New London County |
| Weston Schools And Municipal Buildings | CT1570132 | NTNCWS | Weston | 2,600 | Fairfield County |
| Weston Shopping Center Associates, Llc | CT1570152 | NTNCWS | Weston | 65 | Fairfield County |
| Weston Water Supply | CT1570011 | CWS | Weston | 100 | Fairfield County |
| Westside Manor | CT0421001 | CWS | East Hampton | 30 | Middlesex County |
| Westview Terrace Mobile Home Park | CT1090161 | CWS | Bloomfield Hills | 60 | Windham County |
| Whelen Engineering Co | CT0261063 | NTNCWS | Chester | 400 | Middlesex County |
| Whelen Engineering Co - Aviation | CT0261103 | NTNCWS | Chester | 100 | Middlesex County |
| Whisconier Middle School | CT0181112 | NTNCWS | Brookfield | 950 | Fairfield County |
| Whispering Hills, Llc - Well D System | CT0010111 | CWS | Vernon | 48 | Tolland County |
| Whitby School | CT0570202 | NTNCWS | Greenwich | 350 | Fairfield County |
| Whitcraft Llc | CT0390102 | NTNCWS | Eastford | 272 | Windham County |
| White Barn Children'S Center | CT1419133 | NTNCWS | Thompson | 65 | Windham County |
| White Flower Farm | CT0870344 | NTNCWS | Morris | 95 | Litchfield County |
| White Oak Condominiums | CT0780041 | CWS | East Hartford | 192 | Tolland County |
| Wile Hyundai | CT0300244 | NTNCWS | North Windham | 25 | Tolland County |
| Willington Ridge Condos - System #1 | CT1606111 | CWS | Glastonbury | 102 | Tolland County |
| Willington Ridge Condos - System #2 | CT1606211 | CWS | Glastonbury | 102 | Tolland County |
| Willington Senior Center & Housing | CT1609141 | CWS | Willington | 327 | Tolland County |
| Windham Phoenix Academy | CT1631233 | NTNCWS | Willimantic | 55 | Windham County |
| Windsorville Water Association | CT0470031 | CWS | Broadbrook | 29 | Hartford County |
| Winvian Farm Country Inn - Main System | CT0878023 | NTNCWS | Morris | 55 | Litchfield County |
| Wolcott Police Dept | CT1669043 | NTNCWS | Wolcott | 33 | New Haven County |
| Wolcott Water Department | CT1661423 | CWS | Wolcott | 2,550 | New Haven County |
| Wood Pond (West 1&2) | CT1020254 | NTNCWS | North Stonington | 70 | New London County |
| Woodbury Knoll, Llc. | CT1680051 | CWS | Watertown | 258 | Litchfield County |
| Woodbury Place Condominium Assn | CT1680071 | CWS | Southbury | 72 | Litchfield County |
| Woodcreek Village Condominium Assn, Inc | CT0180201 | CWS | Danbury | 72 | Fairfield County |
| Woodcrest Association, Inc | CT0201021 | CWS | Burlington | 60 | Hartford County |
| Woodhall School, Inc | CT0105033 | CWS | Bethlehem | 68 | Litchfield County |
| Woodhaven Apartments | CT1600031 | CWS | Willington | 489 | Tolland County |
| Woodlake Tax District | CT1680031 | CWS | Woodbury | 912 | Litchfield County |
| Woodland Summit Community Water Assn | CT1420041 | CWS | Tolland | 216 | Tolland County |
| Woodland Terrace | CT0300071 | CWS | Columbia | 27 | Tolland County |
| Woodlawn Apartments | CT0030051 | CWS | East Hartford | 96 | Windham County |
| Woods Edge Apartments | CT0780131 | CWS | East Hartford | 96 | Tolland County |
| Woodstock Academy | CT1691112 | NTNCWS | Woodstock | 1,125 | Windham County |
| Woodstock Academy South Campus | CT1691171 | CWS | Woodstock | 620 | Windham County |
| Woodstock Elementary School | CT1690262 | NTNCWS | Woodstock | 636 | Windham County |
| Woodstock Housing Authority | CT1690031 | CWS | Putnam | 26 | Windham County |
| Woodstock Meadows Condominium Assn. | CT1698011 | CWS | Woodstock | 180 | Windham County |
| Woodstock Middle School | CT1699023 | NTNCWS | Woodstock | 511 | Windham County |
| Worthington Fire District | CT0070031 | CWS | Berlin | 2,875 | Hartford County |
| Wyndham Park Apartments | CT1630021 | CWS | Windham | 312 | Windham County |
| Yeshiva Of Waterbury-Durham Campus | CT0380041 | CWS | Waterbury | 490 | Middlesex County |
| Young Horizons Daycare | CT0610593 | NTNCWS | Haddam | 60 | Middlesex County |