Results from entry points (water leaving treatment, not household taps) of public water systems sampled under EPA's Fifth Unregulated Contaminant Monitoring Rule. Click a county to see every water system serving it, or turn on service areas and click a location to see the systems that serve that spot.
63 of the 1,017 public water systems listed for Idaho were sampled. Sorted by the highest single result relative to EPA's 2024 limits. Each name links to a page with all of that system's results. All 1,017 Idaho systems, including those not tested · Download all Idaho results (CSV, gzip)
| System | PWSID | City | Population | PFOA (ppt) | PFOS (ppt) | HI | Highest single result |
|---|---|---|---|---|---|---|---|
| Garden City Water And Sewer System | ID4010066 | Garden City | 12,500 | <MRL | 28.2 | 3.363 | PFOS ≥ 3 × its limit |
| Capitol Water Corp | ID4010022 | Boise | 9,000 | 5.9 | 9.8 | 5.61 | Hazard Index ≥ 3 × its limit |
| Meridian Water Dept | ID4010097 | Meridian | 152,070 | <MRL | 4.9 | 0.38 | PFOS 1–3 × its limit |
| Mountain Home Air Force Base | ID4200054 | Mountain Home Afb | 7,500 | <MRL | <MRL | 1.002 | Hazard Index 1–3 × its limit |
| Lewiston City Of | ID2350014 | Lewiston | 15,001 | <MRL | <MRL | 0.003 | Hazard Index below its limit |
| Shelley City Of | ID6060071 | Shelley | 4,409 | <MRL | <MRL | 0.002 | Hazard Index below its limit |
| Coeur D Alene City Of | ID1280053 | Coeur D Alene | 54,115 | <MRL | <MRL | 0 | Other PFAS detected |
| Payette City Of | ID3380009 | Payette | 8,127 | <MRL | <MRL | 0 | Other PFAS detected |
| Rathdrum City Of | ID1280152 | Rathdrum | 10,358 | <MRL | <MRL | 0 | Other PFAS detected |
| American Falls City Of | ID6390001 | American Falls | 4,863 | <MRL | <MRL | 0 | No PFAS detected |
| Ammon City Of | ID7100004 | Ammon | 17,338 | <MRL | <MRL | 0 | No PFAS detected |
| Avondale Irrigation Dist | ID1280008 | Hayden | 8,785 | <MRL | <MRL | 0 | No PFAS detected |
| Blackfoot City Of | ID6060007 | Blackfoot | 13,224 | <MRL | <MRL | 0 | No PFAS detected |
| Buhl City Of | ID5420007 | Buhl | 4,518 | <MRL | <MRL | 0 | No PFAS detected |
| Burley Water Dept | ID5160008 | Burley | 10,345 | <MRL | <MRL | 0 | No PFAS detected |
| Caldwell City Of | ID3140013 | Caldwell | 78,740 | <MRL | <MRL | 0 | No PFAS detected |
| Central Shoshone County Water Dist | ID1400089 | Kellogg | 6,455 | <MRL | <MRL | 0 | No PFAS detected |
| Chubbuck City Of | ID6030008 | Chubbuck | 15,842 | <MRL | <MRL | 0 | No PFAS detected |
| Cougar Bay Water Association | ID1280309 | Coeur D'Alene | 230 | <MRL | <MRL | 0 | No PFAS detected |
| Eagle, City Of (Eastern Zone) | ID4010201 | Eagle | 3,702 | <MRL | <MRL | 0 | No PFAS detected |
| Eagle, City Of (Western Zone) | ID4010222 | Eagle | 6,108 | <MRL | <MRL | 0 | No PFAS detected |
| East Greenacres Irrigation Dist | ID1280064 | Post Falls | 11,165 | <MRL | <MRL | 0 | No PFAS detected |
| Emmett City Of | ID3230012 | Emmett | 6,700 | <MRL | <MRL | 0 | No PFAS detected |
| Falls Water Company Inc | ID7100030 | Idaho Falls | 22,650 | <MRL | <MRL | 0 | No PFAS detected |
| Fort Hall | 101612109 | Fort Hall | 2,850 | <MRL | <MRL | 0 | No PFAS detected |
| Fruitland City Of | ID3380005 | Fruitland | 7,458 | <MRL | <MRL | 0 | No PFAS detected |
| Gooding City Of | ID5240009 | Gooding | 3,706 | <MRL | <MRL | 0 | No PFAS detected |
| Grangeville Water Dept | ID2250023 | Grangeville | 3,151 | <MRL | <MRL | 0 | No PFAS detected |
| Hailey Water And Sewer | ID5070022 | Hailey | 8,000 | <MRL | <MRL | 0 | No PFAS detected |
| Hayden Lake Irrigation Dist | ID1280087 | Hayden | 9,375 | <MRL | <MRL | 0 | No PFAS detected |
| Heyburn City Of | ID5340006 | Heyburn | 3,000 | <MRL | <MRL | 0 | No PFAS detected |
| Idaho Falls City Of | ID7100039 | Idaho Falls | 69,450 | <MRL | <MRL | 0 | No PFAS detected |
| Jerome City Of | ID5270011 | Jerome | 13,135 | <MRL | <MRL | 0 | No PFAS detected |
| Kaniksu Shores Estates | ID1090065 | Sandpoint | 93 | <MRL | <MRL | 0 | No PFAS detected |
| Ketchum City Of | ID5070028 | Ketchum | 3,555 | <MRL | <MRL | 0 | No PFAS detected |
| Kooskia Water Dept | ID2250032 | Kamiah | 514 | <MRL | <MRL | 0 | No PFAS detected |
| Kuna City Of | ID4010085 | Kuna | 32,038 | <MRL | <MRL | 0 | No PFAS detected |
| Lewiston Orchards Irrigation Dist | ID2350015 | Lewiston | 20,000 | <MRL | <MRL | 0 | No PFAS detected |
| Mccall City Of | ID4430033 | Mccall | 4,423 | <MRL | <MRL | 0 | No PFAS detected |
| Middleton City Of | ID3140074 | Middleton | 13,190 | <MRL | <MRL | 0 | No PFAS detected |
| Moreland Country Court | ID6060049 | Chubbuck | 60 | <MRL | <MRL | 0 | No PFAS detected |
| Moscow Water Dept | ID2290023 | Moscow | 26,000 | <MRL | <MRL | 0 | No PFAS detected |
| Mountain Home, City Of | ID4200032 | Mountain Home | 14,651 | <MRL | <MRL | 0 | No PFAS detected |
| Nampa City Of | ID3140080 | Nampa | 100,200 | <MRL | <MRL | 0 | No PFAS detected |
| Pierce City Of | ID2180027 | Pierce | 467 | <MRL | <MRL | 0 | No PFAS detected |
| Pocatello Airport | 101600009 | Pocatello | 423 | <MRL | <MRL | 0 | No PFAS detected |
| Pocatello City Of | ID6030043 | Pocatello | 58,231 | <MRL | <MRL | 0 | No PFAS detected |
| Post Falls City Of | ID1280147 | Post Falls | 20,285 | <MRL | <MRL | 0 | No PFAS detected |
| Potlatch City Of | ID2290030 | Potlatch | 812 | <MRL | <MRL | 0 | No PFAS detected |
| Preston City Of | ID6210014 | Preston | 5,591 | <MRL | <MRL | 0 | No PFAS detected |
| Rexburg City Of | ID7330022 | Rexburg | 40,695 | <MRL | <MRL | 0 | No PFAS detected |
| Rigby City Of | ID7260032 | Rigby | 5,400 | <MRL | <MRL | 0 | No PFAS detected |
| Ross Point Water Dist | ID1280163 | Post Falls | 10,473 | <MRL | <MRL | 0 | No PFAS detected |
| Rupert City Of | ID5340017 | Rupert | 5,796 | <MRL | <MRL | 0 | No PFAS detected |
| Sandpoint Public Works Dept | ID1090121 | Sandpoint | 12,284 | <MRL | <MRL | 0 | No PFAS detected |
| St Anthony | ID7220067 | St Anthony | 3,606 | <MRL | <MRL | 0 | No PFAS detected |
| Star Sewer And Water Dist Water System | ID4010220 | Star | 14,000 | <MRL | <MRL | 0 | No PFAS detected |
| Sun Valley Water And Sewer Dist | ID5070051 | Sun Valley | 3,400 | <MRL | <MRL | 0 | No PFAS detected |
| Twin Falls City Of | ID5420058 | Twin Falls | 56,121 | <MRL | <MRL | 0 | No PFAS detected |
| University Of Idaho | ID2290042 | Moscow | 8,589 | <MRL | <MRL | 0 | No PFAS detected |
| Veolia Eagle | ID4010049 | Boise | 10,539 | <MRL | <MRL | 0 | No PFAS detected |
| Veolia Water Idaho | ID4010016 | Boise | 264,978 | <MRL | <MRL | 0 | No PFAS detected |
| Weiser City Of | ID3440011 | Weiser | 5,630 | <MRL | <MRL | 0 | No PFAS detected |
Highest single result for each system; PFOA and PFOS in ppt (ng/L). Entry-point samples, not tap water; screening comparisons, not compliance determinations.