What is PFAS?
Water suppliers
PFAS value per supplier, 2023–2025. EPA limit — 4 ppt (0.004 µg/L) for PFOA and PFOS, set in 2024. Suppliers that detected PFOA or PFOS
are highlighted and listed first. “Not detected” means the contaminant was measured but
not found.
| Supplier | City | Population | PFAS (ug/L) |
|---|---|---|---|
| Norwich Public Utilities | Bozrah | 36,163 | 0.0162 µg/L |
| Manchester Water Department | Glastonbury | 51,198 | 0.0160 µg/L |
| Aquarion-Newtown Regional | Newtown | 6,054 | 0.0159 µg/L |
| Wallingford Water Department | North Haven | 37,267 | 0.0139 µg/L |
| Ctwc - Shoreline Region-Guilford System | Clinton | 33,975 | 0.0120 µg/L |
| Norwalk First Taxing District | New Canaan | 40,256 | 0.0112 µg/L |
| Aquarion-Eastern Fairfield County | Beacon Falls | 351,756 | 0.0109 µg/L |
| Regional Water Authority | Ansonia | 418,900 | 0.0107 µg/L |
| Aquarion-Ridgefield | Ridgefield | 7,476 | 0.0106 µg/L |
| Ctwc - Crystal System | Brooklyn | 6,378 | 0.0099 µg/L |
| Meriden Water Division | Berlin | 58,441 | 0.0095 µg/L |
| East Lyme Water & Sewer Commission | East Lyme | 15,245 | 0.0092 µg/L |
| Colchester Sewer & Water Commission | Colchester | 4,020 | 0.0090 µg/L |
| Hazardville Water Company | East Windsor | 18,544 | 0.0086 µg/L |
| Putnam Water Pollution Control Authority | Putnam | 7,300 | 0.0085 µg/L |
| Aquarion-Valley | Ansonia | 13,080 | 0.0081 µg/L |
| Ctwc - Northern Reg-Western System | East Granby | 101,313 | 0.0080 µg/L |
| Southington Water Department | Cheshire | 43,069 | 0.0080 µg/L |
| Avon Water Co | Avon | 11,590 | 0.0080 µg/L |
| Mashantucket Pequot Water System | Mashantucket | 22,171 | 0.0074 µg/L |
| Aquarion-Plainville Regional | Bristol | 18,231 | 0.0068 µg/L |
| Aquarion-Woodrich Village | Wolcott | 72 | 0.0063 µg/L |
| Ctwc - Unionville System | Avon | 14,693 | 0.0060 µg/L |
| Bethel Water Dept | Bethel | 9,507 | 0.0059 µg/L |
| Aquarion-Darien | Darien | 18,737 | 0.0058 µg/L |
| Aquarion-Greenwich | Greenwich | 53,297 | 0.0056 µg/L |
| Aquarion-New Canaan | New Canaan | 10,097 | 0.0056 µg/L |
| Ctwc - Naugatuck Reg-Collinsville Sys | Avon | 6,324 | 0.0056 µg/L |
| Danbury Water Department | Bethel | 62,055 | 0.0054 µg/L |
| Aquarion-New Milford Regional | Brookfield | 13,331 | 0.0053 µg/L |
| University of Connecticut - Main Campus | Mansfield | 27,199 | 0.0050 µg/L |
| Aquarion Water/Nh | Hampton | 34,000 | 0.0047 µg/L |
| Cromwell Fire District Water Department | Berlin | 14,316 | 0.0046 µg/L |
| Aquarion-Simsbury Regional | East Granby | 14,691 | 0.0044 µg/L |
| Aquarion-Stamford | Darien | 119,214 | 0.0043 µg/L |
| Bristol Water Department | Bristol | 52,079 | 0.0041 µg/L |
| Heritage Water Company | Middlebury | 7,300 | 0.0041 µg/L |
| Metropolitan District Commission | Berlin | 390,887 | Not detected |
| Waterbury Water Department | Middlebury | 107,271 | Not detected |
| New Britain Water Department | Berlin | 73,534 | Not detected |
| South Norwalk Electric & Water | Darien | 42,000 | Not detected |
| Middletown Water Department | Cromwell | 41,019 | Not detected |
| Torrington Water Company | Harwinton | 37,915 | Not detected |
| Mohegan Tribal Utility Authority | Uncasville | 31,961 | Not detected |
| Groton Utilities | Groton | 30,200 | Not detected |
| New London Dept. of Public Utilities | New London | 27,620 | Not detected |
| Ctwc - Naugatuck Region-Central System | Beacon Falls | 22,735 | Not detected |
| Windham Water Works | Mansfield | 21,214 | Not detected |
| Waterford Wpca | Montville | 16,578 | Not detected |
| Aquarion-Mystic | Groton | 10,788 | Not detected |
| Watertown Water & Sewer Authority | Middlebury | 9,972 | Not detected |
| Winsted Water Works | Barkhamsted | 7,784 | Not detected |
| Kensington Fire District | Berlin | 7,553 | Not detected |
| Jewett City Water Company | Griswold | 6,840 | Not detected |
| Watertown Fire District | Watertown | 6,718 | Not detected |
| Ctwc - Naugatuck Reg-Terryville System | Plymouth | 5,607 | Not detected |
| Berlin Water Control Commission | Berlin | 5,128 | Not detected |
| Ctwc - Shoreline Region-Chester System | Chester | 5,030 | Not detected |
| Portland Water Department | Middletown | 5,010 | Not detected |
| Ctwc - Naugatuck Reg-Thomaston System | Plymouth | 3,789 | Not detected |
| Aquarion-Litchfield Regional | Goshen | 3,097 | Not detected |
| Aquarion-New Hartford | New Hartford | 1,872 | Not detected |
| Ctwc - Coventry Hills Div | Coventry | 700 | Not detected |