Drinking water / CT
PFAS in Connecticut drinking water
63 Connecticut public water systems tested under UCMR5. 40 detected at least one PFAS compound; 23 detected none at the reporting thresholds. Values are the highest single result per compound, in ng/L (parts per trillion). The federal limit for PFOA and PFOS is 4 ng/L.
| Water system | Serves | Highest results (ng/L) | Reading |
|---|---|---|---|
| AQUARION WATER CO OF CT-GREENWICH SYSTEM CT0570011 | Fairfield | PFOA 5.6 *PFOS 4.1 *PFHxA 4PFPeA 3.8 | above final limit |
| AQUARION WATER CO OF CT-MAIN SYSTEM CT0150011 | Fairfield | PFOA 10.9 *PFBA 7.6PFHxA 7.4PFPeA 6.7 | above final limit |
| AQUARION WATER CO OF CT-NEW CANAAN SYS CT0900011 | Fairfield | PFOA 5.6 *PFHxA 3.4PFPeA 3 | above final limit |
| AQUARION WATER CO OF CT-NEW MILFORD CT0960011 | Fairfield +1 | PFPeA 6.7PFHxA 5.8PFBS 5.5PFOA 5.3 * | above final limit |
| AQUARION WATER CO OF CT-NEWTOWN SYSTEM CT0970011 | Fairfield | PFOA 15.9 *PFOS 12.7 *PFPeA 8.4PFHxA 7.6 | above final limit |
| AQUARION WATER CO OF CT-NOROTON SYSTEM CT0350011 | Fairfield | PFOA 5.8 *PFBA 5.5PFHxA 3.7PFPeA 3.3 | above final limit |
| AQUARION WATER CO OF CT-RIDGEFIELD SYS CT1180011 | Fairfield | PFPeA 10.6PFOA 10.6 *PFHxA 9.6PFOS 6.1 * | above final limit |
| AQUARION WATER CO OF CT-SIMSBURY SYSTEM CT1280021 | Hartford | ADONA 8.1PFOA 4.4 *PFOS 4.3 *PFHxS 3.7 | above final limit |
| AQUARION WATER CO OF CT-STAMFORD CT1350011 | Fairfield | PFOA 4.3 *PFPeA 3.1PFHxA 3 | above final limit |
| AQUARION WATER CO OF CT-TLWC WOODRICH CT1666011 | New Haven | PFOA 6.3 *PFOS 6.2 *PFBS 4.5PFPeA 4.1 | above final limit |
| AQUARION WATER CO OF CT-VALLEY SYSTEM CT1240011 | New Haven | PFOA 8.1 *PFOS 6.9 *PFPeA 6.8PFHxA 4.9 | above final limit |
| Avon Water Co. CT0040011 | Hartford | PFOS 8 *PFOA 7 *PFHxA 4PFBS 3 | above final limit |
| BETHEL WATER DEPT CT0090011 | Fairfield | PFOA 5.9 *PFBS 3.9PFPeA 3 | above final limit |
| BRISTOL WATER DEPARTMENT CT0170011 | Hartford | PFOA 4.1 *PFPeA 3.1 | above final limit |
| COLCHESTER SEWER & WATER COMMISSION CT0280011 | New London | PFOS 9 *PFHxS 3.6 | above final limit |
| CROMWELL FIRE DISTRICT WATER DEPARTMENT CT0330011 | Middlesex | PFHxS 8.7PFOS 4.6 * | above final limit |
| CTWC - CRYSTAL SYSTEM CT0690011 | Windham | PFOA 9.9 *PFOS 6.8 *PFHxS 4PFBS 3.3 | above final limit |
| CTWC - NAUGATUCK REG-COLLINSVILLE SYS CT0230011 | Hartford | PFOS 5.6 *PFOA 4.9 * | above final limit |
| CTWC - NORTHERN REG-WESTERN SYSTEM CT0473011 | Hartford | PFOA 8 *PFOS 6 *PFBA 5PFHxS 3 | above final limit |
| CTWC - SHORELINE REGION-GUILFORD SYSTEM CT0608011 | New Haven | PFOS 12 *PFBA 12PFOA 6 *PFBS 5 | above final limit |
| CTWC - UNIONVILLE SYSTEM CT0520011 | Hartford | PFBA 7PFOS 6 *PFOA 6 *PFPeA 4 | above final limit |
| DANBURY WATER DEPARTMENT CT0340011 | Fairfield | PFOA 5.4 *PFBS 4.3PFHxA 3.6PFPeA 3.4 | above final limit |
| EAST LYME WATER & SEWER COMMISSION CT0450011 | New London | PFOA 9.2 *PFOS 7.2 *PFPeA 5.6PFHxA 5.4 | above final limit |
| HAZARDVILLE WATER COMPANY CT0490021 | Hartford | PFOA 8.6 *PFHxS 8.1PFOS 5.4 *PFBS 4.8 | above final limit |
| HERITAGE WATER COMPANY CT1300021 | New Haven | PFOA 4.1 *PFBS 3.2 | above final limit |
| MANCHESTER WATER DEPARTMENT CT0770021 | Hartford | PFOS 16 *PFBS 15PFOA 13 *PFHxA 4.7 | above final limit |
| MERIDEN WATER DIVISION CT0800011 | New Haven | PFOS 9.5 *PFOA 6.1 *PFHxA 5.8PFBA 5 | above final limit |
| NORWALK FIRST TAXING DISTRICT CT1030011 | Fairfield | PFOS 11.2 *PFOA 9.5 *PFBS 6.4PFPeA 5.4 | above final limit |
| NORWICH PUBLIC UTILITIES CT1040011 | New London | PFOS 16.2 *PFHxS 12.5PFOA 6.7 *PFBS 6 | above final limit |
| PUTNAM WATER POLLUTION CONTROL AUTHORITY CT1160011 | Windham | PFOA 8.5 *PFOS 7.5 *PFHxS 4PFBS 3.2 | above final limit |
| REGIONAL WATER AUTHORITY CT0930011 | New Haven | PFOS 10.7 *PFOA 7.1 *PFBS 3.5PFPeA 3.1 | above final limit |
| SOUTHINGTON WATER DEPARTMENT CT1310011 | Hartford | PFOA 8 *PFOS 6 *PFBA 5PFHxA 4 | above final limit |
| UNIVERSITY OF CONNECTICUT - MAIN CAMPUS CT0780021 | Tolland | PFBA 5PFOS 5 * | above final limit |
| VALLEY WATER SYSTEMS, INC. CT1100011 | Hartford | PFOS 6.8 *PFBA 6.4PFOA 5.2 * | above final limit |
| WALLINGFORD WATER DEPARTMENT CT1480011 | New Haven | PFOS 13.9 *PFHxS 10.7PFBS 4 | above final limit |
| AQUARION WATER CO OF CT-MYSTIC CT1370011 | New London | PFBS 4 | detected |
| BERLIN WATER CONTROL COMMISSION CT0070021 | Hartford | PFHxS 3.8 | detected |
| JEWETT CITY WATER COMPANY CT0580011 | New London | PFBA 12.1 | detected |
| PORTLAND WATER DEPARTMENT CT1130011 | Middlesex | PFPeA 3.6PFHxA 3.3 | detected |
| WINDHAM WATER WORKS CT1630011 | Windham | PFHxA 3.4 | detected |
* exceeds the final federal MCL for that compound. Detections of compounds whose limits EPA proposed to rescind in May 2026 are shown for information.
Systems with no PFAS detected
23 tested systems reported no PFAS above the laboratory reporting limits. Each has its own page with its sampling detail.
- AQUARION WATER CO OF CT-LITCHFIELD SYS
- CTWC - COVENTRY HILLS DIV
- CTWC - NAUGATUCK REG-TERRYVILLE SYSTEM
- CTWC - NAUGATUCK REG-THOMASTON SYSTEM
- CTWC - NAUGATUCK REGION-CENTRAL SYSTEM
- CTWC - SHORELINE REGION-CHESTER SYSTEM
- GREENWICH AMERICAN CENTER
- GROTON UTILITIES
- KENSINGTON FIRE DISTRICT
- METROPOLITAN DISTRICT COMMISSION
- MIDDLEBURY HAMLET
- MIDDLETOWN WATER DEPARTMENT
- NEW BRITAIN WATER DEPARTMENT
- NEW HARTFORD WATER DEPARTMENT
- NEW LONDON DEPT. OF PUBLIC UTILITIES
- SOUTH NORWALK ELECTRIC & WATER
- STERLING ENGINEERING CORP.
- TORRINGTON WATER COMPANY
- WATERBURY WATER DEPARTMENT
- WATERFORD WPCA
- WATERTOWN FIRE DISTRICT
- WATERTOWN WATER & SEWER AUTHORITY
- WINSTED WATER WORKS
A detection at the system level does not tell you what reaches one specific tap: levels vary by entry point, treatment train and plumbing. A certified lab test of your own tap settles it. Testing and treatment options