PFAS in Maine tap water

5 of 41 tested systems measured above the federal limit. 10 had a detection of any kind.

Every public water system below was required by the EPA to test for 29 PFAS compounds. Sorted by the highest PFOA or PFOS reading, worst first. Find yours for the full set of readings and what removes them.

Water system	Highest PFOA	Highest PFOS	Found	Against the 4 ppt limit
Yarmouth Water District	9.2 ppt	none detected	5 of 29	Above
Sanford Water District	6.8 ppt	7.1 ppt	7 of 29	Above
Kennebec Water District	6.4 ppt	none detected	4 of 29	Above
Houlton Water Company	none detected	4.8 ppt	1 of 29	Above
Lisbon Water Department	4.1 ppt	none detected	5 of 29	Above
Anson and Madison Water District	none detected	none detected	0 of 29	Within
Auburn Water District, Me	none detected	none detected	0 of 29	Within
Bangor Water District	none detected	none detected	0 of 29	Within
Bath Water District	none detected	none detected	0 of 29	Within
Belfast Water District	none detected	none detected	3 of 29	Within
Boothbay Region Water District	none detected	none detected	0 of 29	Within
Brewer Water Department	none detected	none detected	0 of 29	Within
Brunswick / Topsham Water District	none detected	none detected	0 of 29	Within
Caribou Utilities District	none detected	none detected	0 of 29	Within
Ellsworth Water Department	none detected	none detected	0 of 29	Within
Farmington Village Corp Water Dept	none detected	none detected	0 of 29	Within
Franklin Water Department, Me	none detected	none detected	4 of 29	Within
Gardiner Water District	none detected	none detected	2 of 29	Within
Greater Augusta Utility District	none detected	none detected	0 of 29	Within
Hampden Water District	none detected	none detected	0 of 29	Within
Kennebunk, Kennebunkport & Wells Wd	none detected	none detected	0 of 29	Within
Kittery Water District	none detected	none detected	0 of 29	Within
Lake Arrowhead Community Inc	none detected	none detected	0 of 29	Within
Lewiston Water & Sewer Division	none detected	none detected	0 of 29	Within
Maine Water Company Biddeford Saco Div	none detected	none detected	0 of 29	Within
Maine Water Company Camden & Rockland	none detected	none detected	0 of 29	Within
Maine Water Company Millinocket Division	none detected	none detected	0 of 29	Within
Maine Water Company Skowhegan Division	none detected	none detected	0 of 29	Within
Msad 06 Bonny Eagle Middle School	none detected	none detected	1 of 29	Within
Old Town Water District	none detected	none detected	0 of 29	Within
Orono-veazie Water District	none detected	none detected	0 of 29	Within
Portland Water District-greater	none detected	none detected	0 of 29	Within
Presque Isle Utilities District	none detected	none detected	0 of 29	Within
Rumford Water District	none detected	none detected	0 of 29	Within
Saco River Apartments	none detected	none detected	0 of 29	Within
South Berwick Water District	none detected	none detected	0 of 29	Within
Town of Bar Harbor- Water Division	none detected	none detected	2 of 29	Within
US Border Station-long Pond Rd-jackman	none detected	none detected	0 of 29	Within
Van Buren Water District	none detected	none detected	0 of 29	Within
Vinalhaven Water District	none detected	none detected	0 of 29	Within
York Water District	none detected	none detected	0 of 29	Within

All 41 systems the EPA tested in Maine, every one of them with its own page. Each was tested for 29 PFAS compounds.

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Source, the EPA’s fifth Unregulated Contaminant Monitoring Rule, final dataset published 2026-10-15. Original data →