PFAS in Connecticut Water
Based on EPA UCMR 5 testing of 40 public water systems in Connecticut.
40
Systems Tested
40
With PFAS Detected
35
Above EPA Limits
88%
Exceed MCL
Most Commonly Detected PFAS in Connecticut
Systems with detections · EPA UCMR 5 (2023–2025)
PFOA 31 systems
PFOS 28 systems
PFPeA 26 systems
PFBS 24 systems
PFHxA 23 systems
PFHxS 16 systems
Check your Connecticut ZIP code
Get specific results for your neighborhood's water utility.
Water Systems in Connecticut (40)
Click any row to see ZIP-level details| Water System | PWSID | PFAS Detected | Above MCL | Risk |
|---|---|---|---|---|
| NORWICH PUBLIC UTILITIES Groundwater | CT1040011 | 5 | 3 | High Risk |
| CTWC - NORTHERN REG-WESTERN SYSTEM Groundwater | CT0473011 | 8 | 2 | High Risk |
| AQUARION WATER CO OF CT-NEWTOWN SYSTEM Groundwater | CT0970011 | 8 | 2 | High Risk |
| AQUARION WATER CO OF CT-RIDGEFIELD SYS Surface Water | CT1180011 | 8 | 2 | High Risk |
| SOUTHINGTON WATER DEPARTMENT Surface Water | CT1310011 | 8 | 2 | High Risk |
| AQUARION WATER CO OF CT-MAIN SYSTEM Surface Water | CT0150011 | 7 | 2 | High Risk |
| CTWC - SHORELINE REGION-GUILFORD SYSTEM Groundwater | CT0608011 | 7 | 2 | High Risk |
| MANCHESTER WATER DEPARTMENT MX | CT0770021 | 7 | 2 | High Risk |
| MERIDEN WATER DIVISION Groundwater | CT0800011 | 7 | 2 | High Risk |
| EAST LYME WATER & SEWER COMMISSION Groundwater | CT0450011 | 6 | 2 | High Risk |
| HAZARDVILLE WATER COMPANY Groundwater | CT0490021 | 6 | 2 | High Risk |
| CTWC - UNIONVILLE SYSTEM Groundwater | CT0520011 | 6 | 2 | High Risk |
| NORWALK FIRST TAXING DISTRICT Surface Water | CT1030011 | 6 | 2 | High Risk |
| AQUARION WATER CO OF CT-VALLEY SYSTEM Surface Water | CT1240011 | 6 | 2 | High Risk |
| AQUARION WATER CO OF CT-TLWC WOODRICH Groundwater | CT1666011 | 6 | 2 | High Risk |
| AQUARION WATER CO OF CT-NEW MILFORD Groundwater | CT0960011 | 5 | 2 | High Risk |
| PUTNAM WATER POLLUTION CONTROL AUTHORITY Surface Water | CT1160011 | 5 | 2 | High Risk |
| AQUARION WATER CO OF CT-SIMSBURY SYSTEM Groundwater | CT1280021 | 5 | 2 | High Risk |
| Avon Water Co. Groundwater | CT0040011 | 4 | 2 | High Risk |
| AQUARION WATER CO OF CT-GREENWICH SYSTEM Surface Water | CT0570011 | 4 | 2 | High Risk |
| CTWC - CRYSTAL SYSTEM Groundwater | CT0690011 | 4 | 2 | High Risk |
| REGIONAL WATER AUTHORITY Surface Water | CT0930011 | 4 | 2 | High Risk |
| VALLEY WATER SYSTEMS, INC. Groundwater | CT1100011 | 4 | 2 | High Risk |
| WALLINGFORD WATER DEPARTMENT Groundwater | CT1480011 | 3 | 2 | High Risk |
| CTWC - NAUGATUCK REG-COLLINSVILLE SYS Groundwater | CT0230011 | 2 | 2 | High Risk |
| DANBURY WATER DEPARTMENT Surface Water | CT0340011 | 4 | 1 | High Risk |
| AQUARION WATER CO OF CT-NOROTON SYSTEM Surface Water | CT0350011 | 4 | 1 | High Risk |
| BETHEL WATER DEPT Groundwater | CT0090011 | 3 | 1 | High Risk |
| AQUARION WATER CO OF CT-NEW CANAAN SYS Surface Water | CT0900011 | 3 | 1 | High Risk |
| AQUARION WATER CO OF CT-STAMFORD Surface Water | CT1350011 | 3 | 1 | High Risk |
| BRISTOL WATER DEPARTMENT Groundwater | CT0170011 | 2 | 1 | High Risk |
| COLCHESTER SEWER & WATER COMMISSION Groundwater | CT0280011 | 2 | 1 | High Risk |
| CROMWELL FIRE DISTRICT WATER DEPARTMENT Groundwater | CT0330011 | 2 | 1 | High Risk |
| UNIVERSITY OF CONNECTICUT - MAIN CAMPUS Groundwater | CT0780021 | 2 | 1 | High Risk |
| HERITAGE WATER COMPANY Groundwater | CT1300021 | 2 | 1 | High Risk |
| PORTLAND WATER DEPARTMENT MX | CT1130011 | 2 | 0 | Low Level |
| BERLIN WATER CONTROL COMMISSION Groundwater | CT0070021 | 1 | 0 | Low Level |
| JEWETT CITY WATER COMPANY Surface Water | CT0580011 | 1 | 0 | Low Level |
| AQUARION WATER CO OF CT-MYSTIC Groundwater | CT1370011 | 1 | 0 | Low Level |
| WINDHAM WATER WORKS Surface Water | CT1630011 | 1 | 0 | Low Level |