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PFAS in Idaho drinking water

62 community water systems tested

4.8%
of tested systems detected PFOA or PFOS
(3/62)

PFAS — “forever chemicals” — are synthetic compounds that accumulate in the body and are linked to cancer, liver damage and immune effects. In 2024 the EPA set enforceable limits of 4 parts per trillion each for PFOA and PFOS. These are the only nationwide PFAS measurements, from the EPA’s UCMR-5 program.

Water systems

PFAS value per system, 2023–2025. EPA limit — 4 ppt (0.004 µg/L) for PFOA and PFOS, set in 2024. Systems that detected PFOA or PFOS are highlighted and listed first. “Not detected” means the contaminant was measured but not found.
SystemCityPopulationPFAS (ug/L)
GARDEN CITY WATER AND SEWER SYSTEM 12,500 0.0282 ug/L
CAPITOL WATER CORP 9,000 0.0098 ug/L
MERIDIAN WATER DEPT 147,340 0.0049 ug/L
VEOLIA WATER IDAHO 264,978 Not detected
NAMPA CITY OF 100,200 Not detected
CALDWELL CITY OF 74,000 Not detected
IDAHO FALLS CITY OF 69,450 Not detected
POCATELLO CITY OF POCATELLO 58,231 Not detected
TWIN FALLS CITY OF 56,121 Not detected
COEUR D ALENE CITY OF 54,115 Not detected
REXBURG CITY OF 40,695 Not detected
KUNA CITY OF 32,038 Not detected
MOSCOW WATER DEPT 26,000 Not detected
FALLS WATER COMPANY INC 22,650 Not detected
POST FALLS CITY OF 20,285 Not detected
LEWISTON ORCHARDS IRRIGATION DIST 20,000 Not detected
AMMON CITY OF 17,338 Not detected
CHUBBUCK CITY OF 15,842 Not detected
LEWISTON CITY OF 15,001 Not detected
MOUNTAIN HOME, CITY OF 14,651 Not detected
STAR SEWER AND WATER DIST WATER SYSTEM 14,000 Not detected
BLACKFOOT CITY OF 13,224 Not detected
MIDDLETON CITY OF 13,190 Not detected
JEROME CITY OF 13,135 Not detected
SANDPOINT PUBLIC WORKS DEPT 12,284 Not detected
EAST GREENACRES IRRIGATION DIST 11,165 Not detected
RATHDRUM CITY OF 10,358 Not detected
BURLEY WATER DEPT 10,345 Not detected
HAYDEN LAKE IRRIGATION DIST 9,375 Not detected
ROSS POINT WATER DIST 8,965 Not detected
AVONDALE IRRIGATION DIST 8,785 Not detected
UNIVERSITY OF IDAHO 8,589 Not detected
PAYETTE CITY OF 8,127 Not detected
HAILEY WATER AND SEWER 8,000 Not detected
MOUNTAIN HOME AIR FORCE BASE 7,500 Not detected
FRUITLAND CITY OF 7,458 Not detected
EMMETT CITY OF 6,700 Not detected
EAGLE, CITY OF (WESTERN ZONE) 6,108 Not detected
CENTRAL SHOSHONE COUNTY WATER DIST 6,098 Not detected
RUPERT CITY OF 5,796 Not detected
WEISER CITY OF 5,630 Not detected
PRESTON CITY OF 5,591 Not detected
RIGBY CITY OF 5,400 Not detected
HYDE PARK CITY WATER SYSTEM 5,200 Not detected
AMERICAN FALLS CITY OF 4,863 Not detected
BUHL CITY OF 4,518 Not detected
MCCALL CITY OF 4,423 Not detected
SHELLEY CITY OF 4,409 Not detected
GOODING CITY OF 3,706 Not detected
EAGLE, CITY OF (EASTERN ZONE) 3,702 Not detected
ST ANTHONY 3,606 Not detected
KETCHUM CITY OF 3,555 Not detected
SUN VALLEY WATER AND SEWER DIST 3,400 Not detected
GRANGEVILLE WATER DEPT 3,151 Not detected
HEYBURN CITY OF 3,000 Not detected
FORT HALL FORT HALL 2,850 Not detected
POTLATCH CITY OF 812 Not detected
KOOSKIA WATER DEPT 607 Not detected
PIERCE CITY OF 467 Not detected
COUGAR BAY WATER ASSOCIATION 230 Not detected
KANIKSU SHORES ESTATES 93 Not detected
MORELAND COUNTRY COURT 60 Not detected