PFAS in Idaho tap water

3 of 61 tested systems measured above the federal limit. 9 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
Garden City Water and Sewer System	none detected	28.2 ppt	7 of 29	Above
Capitol Water Corp	5.9 ppt	9.8 ppt	7 of 29	Above
Meridian Water Dept	none detected	4.9 ppt	2 of 29	Above
American Falls City of	none detected	none detected	0 of 29	Within
Ammon City of	none detected	none detected	0 of 29	Within
Avondale Irrigation Dist	none detected	none detected	0 of 29	Within
Blackfoot City of	none detected	none detected	0 of 29	Within
Buhl City of	none detected	none detected	0 of 29	Within
Burley Water Dept	none detected	none detected	0 of 29	Within
Caldwell City of	none detected	none detected	0 of 29	Within
Central Shoshone County Water Dist	none detected	none detected	0 of 29	Within
Chubbuck City of	none detected	none detected	0 of 29	Within
Coeur D Alene City of	none detected	none detected	1 of 29	Within
Cougar Bay Water Association	none detected	none detected	0 of 29	Within
Eagle, City of (eastern Zone)	none detected	none detected	0 of 29	Within
Eagle, City of (western Zone)	none detected	none detected	0 of 29	Within
East Greenacres Irrigation Dist	none detected	none detected	0 of 29	Within
Emmett City of	none detected	none detected	0 of 29	Within
Falls Water Company Inc	none detected	none detected	0 of 29	Within
Fruitland City of	none detected	none detected	0 of 29	Within
Gooding City of	none detected	none detected	0 of 29	Within
Grangeville Water Dept	none detected	none detected	0 of 29	Within
Hailey Water and Sewer	none detected	none detected	0 of 29	Within
Hayden Lake Irrigation Dist	none detected	none detected	0 of 29	Within
Heyburn City of	none detected	none detected	0 of 29	Within
Idaho Falls City of	none detected	none detected	0 of 29	Within
Jerome City of	none detected	none detected	0 of 29	Within
Kaniksu Shores Estates	none detected	none detected	0 of 29	Within
Ketchum City of	none detected	none detected	0 of 29	Within
Kooskia Water Dept	none detected	none detected	0 of 29	Within
Kuna City of	none detected	none detected	0 of 29	Within
Lewiston City of	none detected	none detected	3 of 29	Within
Lewiston Orchards Irrigation Dist	none detected	none detected	0 of 29	Within
Mccall City of	none detected	none detected	0 of 29	Within
Middleton City of	none detected	none detected	0 of 29	Within
Moreland Country Court	none detected	none detected	0 of 29	Within
Moscow Water Dept	none detected	none detected	0 of 29	Within
Mountain Home Air Force Base	none detected	none detected	4 of 29	Within
Mountain Home City of	none detected	none detected	0 of 29	Within
Nampa City of	none detected	none detected	0 of 29	Within
Payette City of	none detected	none detected	2 of 29	Within
Pierce City of	none detected	none detected	0 of 29	Within
Pocatello City of	none detected	none detected	0 of 29	Within
Post Falls City of	none detected	none detected	0 of 29	Within
Potlatch City of	none detected	none detected	0 of 29	Within
Preston City of	none detected	none detected	0 of 29	Within
Rathdrum City of	none detected	none detected	2 of 29	Within
Rexburg City of	none detected	none detected	0 of 29	Within
Rigby City of	none detected	none detected	0 of 29	Within
Ross Point Water Dist	none detected	none detected	0 of 29	Within
Rupert City of	none detected	none detected	0 of 29	Within
Sandpoint Public Works Dept	none detected	none detected	0 of 29	Within
Shelley City of	none detected	none detected	1 of 29	Within
St Anthony	none detected	none detected	0 of 29	Within
Star Sewer and Water Dist Water System	none detected	none detected	0 of 29	Within
Sun Valley Water and Sewer Dist	none detected	none detected	0 of 29	Within
Twin Falls City of	none detected	none detected	0 of 29	Within
University of Idaho	none detected	none detected	0 of 29	Within
Veolia Eagle	none detected	none detected	0 of 29	Within
Veolia Water ID	none detected	none detected	0 of 29	Within
Weiser City of	none detected	none detected	0 of 29	Within

All 61 systems the EPA tested in Idaho, 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 →