Drinking water / ME

PFAS in Maine drinking water

41 Maine public water systems tested under UCMR5. 10 detected at least one PFAS compound; 31 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
HOULTON WATER COMPANY ME0090700	Aroostook	PFOS 4.8 *	above final limit
KENNEBEC WATER DISTRICT ME0090750	Kennebec	PFBA 6.5PFOA 6.4 PFHpA 5.4*PFHxA 3	above final limit
LISBON WATER DEPARTMENT ME0090870	Androscoggin	PFHxS 13.2PFBS 9.3PFHxA 5.5PFPeA 4.5	above final limit
SANFORD WATER DISTRICT ME0091410	York	PFPeA 10.7PFHxA 7.3PFOS 7.1 PFOA 6.8* *	above final limit
YARMOUTH WATER DISTRICT ME0091670	Cumberland	PFHxA 9.8PFOA 9.2 PFPeA 8.9PFBA 6.8*	above final limit
BELFAST WATER DISTRICT ME0090140	Waldo	PFHxA 10.7PFBA 6.7PFPeA 5.5	detected
FRANKLIN WATER DEPARTMENT, ME ME0090570	Hancock	PFHxA 10.2PFBA 6PFPeA 4PFHxS 3.3	detected
GARDINER WATER DISTRICT ME0090610	Kennebec	PFHxS 4.2PFHxA 4.1	detected
MSAD 06 BONNY EAGLE MIDDLE SCHOOL ME0000147	York	PFBA 17	detected
TOWN OF BAR HARBOR- WATER DIVISION ME0090120	Hancock	PFHxA 3.2PFPeA 3	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

31 tested systems reported no PFAS above the laboratory reporting limits. Each has its own page with its sampling detail.

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