PFAS in Connecticut Water

Based on EPA UCMR 5 testing of 40 public water systems in Connecticut.

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Systems Tested

With PFAS Detected

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)

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

Click any row to see ZIP-level details. Click PWSID to see the full utility page.