PFAS in Connecticut drinking water
63 community water systems tested
58.7%
of tested systems detected PFOA or PFOS
(37/63)
(37/63)
Water systems
PFAS value per system, 2023–2025. EPA limit — 4 ppt (0.004 µg/L) for PFOA and PFOS, set in 2024. Systems that detected PFOA or PFOS
are highlighted and listed first. “Not detected” means the contaminant was measured but
not found.
| System | City | Population | PFAS (ug/L) |
|---|---|---|---|
| NORWICH PUBLIC UTILITIES | BOZRAH | 36,163 | 0.0162 ug/L |
| MANCHESTER WATER DEPARTMENT | GLASTONBURY | 51,198 | 0.0160 ug/L |
| AQUARION-NEWTOWN REGIONAL | NEWTOWN | 6,054 | 0.0159 ug/L |
| WALLINGFORD WATER DEPARTMENT | NORTH HAVEN | 37,267 | 0.0139 ug/L |
| CTWC - SHORELINE REGION-GUILFORD SYSTEM | CLINTON | 33,975 | 0.0120 ug/L |
| NORWALK FIRST TAXING DISTRICT | NEW CANAAN | 40,256 | 0.0112 ug/L |
| AQUARION-EASTERN FAIRFIELD COUNTY | BEACON FALLS | 351,756 | 0.0109 ug/L |
| REGIONAL WATER AUTHORITY | ANSONIA | 418,900 | 0.0107 ug/L |
| AQUARION-RIDGEFIELD | RIDGEFIELD | 7,476 | 0.0106 ug/L |
| CTWC - CRYSTAL SYSTEM | BROOKLYN | 6,378 | 0.0099 ug/L |
| MERIDEN WATER DIVISION | BERLIN | 58,441 | 0.0095 ug/L |
| EAST LYME WATER & SEWER COMMISSION | EAST LYME | 15,245 | 0.0092 ug/L |
| COLCHESTER SEWER & WATER COMMISSION | COLCHESTER | 4,020 | 0.0090 ug/L |
| HAZARDVILLE WATER COMPANY | EAST WINDSOR | 18,544 | 0.0086 ug/L |
| PUTNAM WATER POLLUTION CONTROL AUTHORITY | PUTNAM | 7,300 | 0.0085 ug/L |
| AQUARION-VALLEY | ANSONIA | 13,080 | 0.0081 ug/L |
| CTWC - NORTHERN REG-WESTERN SYSTEM | EAST GRANBY | 101,313 | 0.0080 ug/L |
| SOUTHINGTON WATER DEPARTMENT | CHESHIRE | 43,069 | 0.0080 ug/L |
| AVON WATER CO | AVON | 11,590 | 0.0080 ug/L |
| Mashantucket Pequot Water System | 22,171 | 0.0074 ug/L | |
| AQUARION-PLAINVILLE REGIONAL | BRISTOL | 18,231 | 0.0068 ug/L |
| AQUARION-WOODRICH VILLAGE | WOLCOTT | 72 | 0.0063 ug/L |
| CTWC - UNIONVILLE SYSTEM | AVON | 14,693 | 0.0060 ug/L |
| BETHEL WATER DEPT | BETHEL | 9,507 | 0.0059 ug/L |
| AQUARION-DARIEN | DARIEN | 18,737 | 0.0058 ug/L |
| AQUARION-GREENWICH | GREENWICH | 53,297 | 0.0056 ug/L |
| AQUARION-NEW CANAAN | NEW CANAAN | 10,097 | 0.0056 ug/L |
| CTWC - NAUGATUCK REG-COLLINSVILLE SYS | AVON | 6,324 | 0.0056 ug/L |
| DANBURY WATER DEPARTMENT | BETHEL | 62,055 | 0.0054 ug/L |
| AQUARION-NEW MILFORD REGIONAL | BROOKFIELD | 13,331 | 0.0053 ug/L |
| UNIVERSITY OF CONNECTICUT - MAIN CAMPUS | MANSFIELD | 27,199 | 0.0050 ug/L |
| AQUARION WATER/NH | HAMPTON | 34,000 | 0.0047 ug/L |
| CROMWELL FIRE DISTRICT WATER DEPARTMENT | BERLIN | 14,316 | 0.0046 ug/L |
| AQUARION-SIMSBURY REGIONAL | EAST GRANBY | 14,691 | 0.0044 ug/L |
| AQUARION-STAMFORD | DARIEN | 119,214 | 0.0043 ug/L |
| BRISTOL WATER DEPARTMENT | BRISTOL | 52,079 | 0.0041 ug/L |
| HERITAGE WATER COMPANY | MIDDLEBURY | 7,300 | 0.0041 ug/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 | 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 |