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PFAS in drinking water: Idaho

EPA UCMR 5 results for 61 public water systems. 9 had at least one PFAS detected; 3 had a highest single PFOA or PFOS result above 4.0 ppt.

UCMR 5 is a one-time EPA monitoring program, not a compliance determination. The values shown are the highest single sample result at any of the system's sampling points; one result above 4.0 ppt does not mean the system violates the PFAS rule, which is judged on running annual averages under separate compliance monitoring. Results describe the public water system, not an individual home.

Water systemServesPFOA max (ppt)PFOS max (ppt)PFAS detected
American Falls City Of
ID6390001		Power CountyNDND0
Ammon City Of
ID7100004		Bonneville CountyNDND0
Avondale Irrigation Dist
ID1280008		Kootenai CountyNDND0
Blackfoot City Of
ID6060007		Bingham CountyNDND0
Buhl City Of
ID5420007		Twin Falls CountyNDND0
Burley Water Dept
ID5160008		Cassia CountyNDND0
Caldwell City Of
ID3140013		Canyon CountyNDND0
Capitol Water Corp
ID4010022		Ada County5.99.87
Central Shoshone County Water Dist
ID1400089		Shoshone CountyNDND0
Chubbuck City Of
ID6030008		Bannock CountyNDND0
Coeur D Alene City Of
ID1280053		Kootenai CountyNDND1
Cougar Bay Water Association
ID1280309		Kootenai CountyNDND0
Eagle, City of (Eastern Zone)
ID4010201		Ada CountyNDND0
Eagle, City of (Western Zone)
ID4010222		Ada CountyNDND0
East Greenacres Irrigation Dist
ID1280064		Kootenai CountyNDND0
Emmett City Of
ID3230012		Gem CountyNDND0
Falls Water Company Inc
ID7100030		Bonneville CountyNDND0
Fruitland City Of
ID3380005		Payette CountyNDND0
Garden City Water and Sewer System
ID4010066		Ada CountyND28.27
Gooding City Of
ID5240009		Gooding CountyNDND0
Grangeville Water Dept
ID2250023		Idaho CountyNDND0
Hailey Water and Sewer
ID5070022		Blaine CountyNDND0
Hayden Lake Irrigation Dist
ID1280087		Kootenai CountyNDND0
Heyburn City Of
ID5340006		Minidoka CountyNDND0
Idaho Falls City Of
ID7100039		Bonneville CountyNDND0
Jerome City Of
ID5270011		Jerome CountyNDND0
Kaniksu Shores Estates
ID1090065		Bonner CountyNDND0
Ketchum City Of
ID5070028		Blaine CountyNDND0
Kooskia Water Dept
ID2250032		Idaho CountyNDND0
Kuna City Of
ID4010085		Ada CountyNDND0
Lewiston City Of
ID2350014		Nez Perce CountyNDND3
Lewiston Orchards Irrigation Dist
ID2350015		Nez Perce CountyNDND0
Mccall City Of
ID4430033		Valley CountyNDND0
Meridian Water Dept
ID4010097		Ada CountyND4.92
Middleton City Of
ID3140074		Canyon CountyNDND0
Moreland Country Court
ID6060049		Bingham CountyNDND0
Moscow Water Dept
ID2290023		Latah CountyNDND0
Mountain Home Air Force Base
ID4200054		Elmore CountyNDND4
Mountain Home City Of
ID4200032		Elmore CountyNDND0
Nampa City Of
ID3140080		Canyon CountyNDND0
Payette City Of
ID3380009		Payette CountyNDND2
Pierce City Of
ID2180027		Clearwater CountyNDND0
Pocatello City Of
ID6030043		PocatelloNDND0
Post Falls City Of
ID1280147		Kootenai CountyNDND0
Potlatch City Of
ID2290030		Latah CountyNDND0
Preston City Of
ID6210014		Franklin CountyNDND0
Rathdrum City Of
ID1280152		Kootenai CountyNDND2
Rexburg City Of
ID7330022		Madison CountyNDND0
Rigby City Of
ID7260032		Jefferson CountyNDND0
Ross Point Water Dist
ID1280163		Kootenai CountyNDND0
Rupert City Of
ID5340017		Minidoka CountyNDND0
Sandpoint Public Works Dept
ID1090121		Bonner CountyNDND0
Shelley City Of
ID6060071		Bingham CountyNDND1
St Anthony
ID7220067		Fremont CountyNDND0
Star Sewer and Water Dist Water System
ID4010220		Ada CountyNDND0
Sun Valley Water and Sewer Dist
ID5070051		Blaine CountyNDND0
Twin Falls City Of
ID5420058		Twin Falls CountyNDND0
University of Idaho
ID2290042		Latah CountyNDND0
Veolia Eagle
ID4010049		Ada CountyNDND0
Veolia Water Id
ID4010016		Ada CountyNDND0
Weiser City Of
ID3440011		Washington CountyNDND0

ND = not detected (below the 4 ppt UCMR 5 reporting level). Values are the highest single sample result, not an annual average.

Source: EPA UCMR 5 final occurrence data (EPA page last updated 2026-08-28; samples collected January 2023 – December 2025) ↗.

PFAS disclaimer: PFAS results are copied from EPA's UCMR 5 dataset and describe samples taken at a public water system's entry points between 2023 and 2025, not water at any specific address. Levels may have changed since sampling (for example, after new treatment). “Not detected” means below EPA's UCMR 5 minimum reporting level, not zero. This is not a compliance determination or a water test. Contact your water utility for current information.