Drinking water / ID
PFAS in Idaho drinking water
61 Idaho public water systems tested under UCMR5. 9 detected at least one PFAS compound; 52 detected none at the reporting thresholds. Values are the highest single result per compound, in ng/L (parts per trillion). The federal limit for PFOA and PFOS is 4 ng/L.
| Water system | Serves | Highest results (ng/L) | Reading |
|---|---|---|---|
| CAPITOL WATER CORP ID4010022 | Ada | PFNA 51PFOS 9.8 *PFOA 5.9 *PFHxS 5.5 | above final limit |
| GARDEN CITY WATER AND SEWER SYSTEM ID4010066 | Ada | PFOS 28.2 *PFHxS 25.4PFNA 8.2PFBS 6.7 | above final limit |
| MERIDIAN WATER DEPT ID4010097 | Ada | PFOS 4.9 *PFHxS 3.8 | above final limit |
| COEUR D ALENE CITY OF ID1280053 | Kootenai | PFPeA 3.4 | detected |
| LEWISTON CITY OF ID2350014 | Nez Perce | PFBS 5.6PFPeA 4.7PFHxA 4.3 | detected |
| MOUNTAIN HOME AIR FORCE BASE ID4200054 | Elmore | PFHxA 13PFHxS 10PFPeA 6.7PFBS 4.8 | detected |
| PAYETTE CITY OF ID3380009 | Payette | PFPeA 4.3PFHxA 3.6 | detected |
| RATHDRUM CITY OF ID1280152 | Kootenai | PFPeA 8PFHxA 4.2 | detected |
| SHELLEY CITY OF ID6060071 | Bingham | PFBS 3 | detected |
* exceeds the final federal MCL for that compound. Detections of compounds whose limits EPA proposed to rescind in May 2026 are shown for information.
Systems with no PFAS detected
52 tested systems reported no PFAS above the laboratory reporting limits. Each has its own page with its sampling detail.
- AMERICAN FALLS CITY OF
- AMMON CITY OF
- AVONDALE IRRIGATION DIST
- BLACKFOOT CITY OF
- BUHL CITY OF
- BURLEY WATER DEPT
- CALDWELL CITY OF
- CENTRAL SHOSHONE COUNTY WATER DIST
- CHUBBUCK CITY OF
- COUGAR BAY WATER ASSOCIATION
- EAGLE, CITY OF (EASTERN ZONE)
- EAGLE, CITY OF (WESTERN ZONE)
- EAST GREENACRES IRRIGATION DIST
- EMMETT CITY OF
- FALLS WATER COMPANY INC
- FRUITLAND CITY OF
- GOODING CITY OF
- GRANGEVILLE WATER DEPT
- HAILEY WATER AND SEWER
- HAYDEN LAKE IRRIGATION DIST
- HEYBURN CITY OF
- IDAHO FALLS CITY OF
- JEROME CITY OF
- KANIKSU SHORES ESTATES
- KETCHUM CITY OF
- KOOSKIA WATER DEPT
- KUNA CITY OF
- LEWISTON ORCHARDS IRRIGATION DIST
- MCCALL CITY OF
- MIDDLETON CITY OF
- MORELAND COUNTRY COURT
- MOSCOW WATER DEPT
- MOUNTAIN HOME CITY OF
- NAMPA CITY OF
- PIERCE CITY OF
- POCATELLO CITY OF
- POST FALLS CITY OF
- POTLATCH CITY OF
- PRESTON CITY OF
- REXBURG CITY OF
- RIGBY CITY OF
- ROSS POINT WATER DIST
- RUPERT CITY OF
- SANDPOINT PUBLIC WORKS DEPT
- ST ANTHONY
- STAR SEWER AND WATER DIST WATER SYSTEM
- SUN VALLEY WATER AND SEWER DIST
- TWIN FALLS CITY OF
- UNIVERSITY OF IDAHO
- Veolia Eagle
- Veolia Water ID
- WEISER CITY OF
A detection at the system level does not tell you what reaches one specific tap: levels vary by entry point, treatment train and plumbing. A certified lab test of your own tap settles it. Testing and treatment options