Idaho tap water, by utility.

68 utilities with a full report, serving 1.4 million people as they report it. Regulated PFAS turned up at 6 of them.

Idaho utilities by population served
Utility	Based in	Serves	Regulated PFAS	Health-based violations since 2016
Veolia Water Idaho	Boise	264,978	None found	0
Meridian Water Dept	Meridian	147,340	PFOS, PFHxS	0
City of Nampa	Nampa	100,200	None found	0
City of Caldwell	Caldwell	74,000	None found	0
City of Idaho Falls	Idaho Falls	69,450	None found	0
City of Pocatello	Pocatello	58,231	None found	1
City of Twin Falls	Twin Falls	56,121	None found	0
City of Coeur D Alene	Coeur D Alene	54,115	None found	0
City of Rexburg	Rexburg	40,695	None found	1
City of Kuna	Kuna	32,038	None found	0
Moscow Water Dept	Moscow	26,000	None found	0
Falls Water Company Inc	Idaho Falls	22,650	None found	1
City of Post Falls	Post Falls	20,285	None found	1
Lewiston Orchards Irrigation Dist	Lewiston	20,000	None found	0
City of Ammon	Ammon	17,338	None found	0
City of Chubbuck	Chubbuck	15,842	None found	0
City of Lewiston	Lewiston	15,001	PFBS	0
City of Mountain Home	Mountain Home	14,651	None found	3
Star Sewer and Water Dist Water System	Star	14,000	None found	0
City of Blackfoot	Blackfoot	13,224	None found	2
City of Middleton	Middleton	13,190	None found	0
City of Jerome	Jerome	13,135	None found	0
Garden City Water and Sewer System	Garden City	12,500	PFOS, PFHxS, PFNA, PFBS	0
Sandpoint Public Works Dept	Sandpoint	12,284	None found	1
East Greenacres Irrigation Dist	Post Falls	11,165	None found	0
City of Rathdrum	Rathdrum	10,358	None found	0
Burley Water Dept	Burley	10,345	None found	3
Hayden Lake Irrigation Dist	Hayden	9,375	None found	0
Capitol Water Corp	Boise	9,000	PFOA, PFOS, PFHxS, PFNA, PFBS	3
Ross Point Water Dist	Post Falls	8,965	None found	0
Avondale Irrigation Dist	Hayden	8,785	None found	0
University of Idaho	Moscow	8,589	None found	0
City of Payette	Payette	8,127	None found	0
Hailey Water and Sewer	Hailey	8,000	None found	0
Mountain Home Air Force Base	Mountain Home AFB	7,500	PFHxS, PFBS	15
City of Fruitland	Fruitland	7,458	None found	5
City of Emmett	Emmett	6,700	None found	0
Eagle, City of (Western Zone)	Eagle	6,108	None found	0
Central Shoshone County Water Dist	Kellogg	6,098	None found	0
City of Rupert	Rupert	5,796	None found	0
City of Weiser	Weiser	5,630	None found	0
City of Preston	Preston	5,591	None found	2
City of Rigby	Rigby	5,400	None found	1
City of Kimberly	Kimberly	5,359	Not sampled	1
City of American Falls	American Falls	4,863	None found	0
City of Buhl	Buhl	4,518	None found	0
City of McCall	McCall	4,423	None found	12
City of Shelley	Shelley	4,409	PFBS	0
City of St Maries	St Maries	4,173	Not sampled	0
Hillside Service Area	Rathdrum	4,140	Not sampled	0
City of Gooding	Gooding	3,706	None found	0
Eagle, City of (Eastern Zone)	Eagle	3,702	None found	0
St Anthony	St Anthony	3,606	None found	0
City of Ketchum	Ketchum	3,555	None found	0
Rimrock Service Area	Rathdrum	3,493	Not sampled	0
Sun Valley Water and Sewer Dist	Sun Valley	3,400	None found	0
City of Bonners Ferry	Bonners Ferry	3,367	Not sampled	0
Idoc Sbx Complex	Boise	3,309	Not sampled	0
City of Homedale	Homedale	3,300	Not sampled	0
Grangeville Water Dept	Grangeville	3,151	None found	0
City of Heyburn	Heyburn	3,000	None found	0
Fort Hall	Fort Hall	2,850	None found	1
City of Potlatch	Potlatch	812	None found	1
Kooskia Water Dept	Kooskia	607	None found	0
City of Pierce	Pierce	467	None found	1
Cougar Bay Water Association	Coeur D'Alene	230	None found	0
Kaniksu Shores Estates	Sandpoint	93	None found	1
Moreland Country Court	Chubbuck	60	None found	2
Utilities EPA sampled under UCMR 5, plus any other community system serving 3,300 people or more. Smaller systems appear in ZIP code results. Data: EPA SDWIS 2026 Q2 and UCMR 5.