Systems with a yearly average above an EPA comparison level
3.3%2 of 61 active community water systems
All 61 systems met the sampling requirement for a yearly average. Of those systems, 2 had at least one yearly average above an EPA comparison level and 59 did not.
EPA-based study benchmark: a fixed, unrounded research cutoff used to reproduce EPA’s final UCMR 5 technical-assistance classification based on the April 2024 federal levels. It is not a current federal or state standard. The label does not determine compliance, household exposure, or health risk.
State rules: The labels on this page use fixed research cutoffs based on the April 2024 federal levels. Idaho may use different current standards or guidance. These UCMR 5 results do not determine current federal or state compliance. Find the official Idaho drinking-water program →
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A ZIP code finds possible public water systems for an area; it cannot identify the supplier for a specific home. Confirm the provider using a water bill or utility record.
Compound summary
System counts in Idaho
Each count shows how many included water systems had a yearly average above the named EPA comparison level.
| EPA rounding cutoff | Systems above comparison level | Water systems included | Percent |
|---|---|---|---|
| PFOA: 4 ppt level; unrounded average ≥4.05 ppt after applying EPA rounding | 1 | 61 | 1.6% |
| PFOS: 4 ppt level; unrounded average ≥4.05 ppt after applying EPA rounding | 2 | 61 | 3.3% |
| PFHxS: 10 ppt level; unrounded average ≥15 ppt after applying EPA rounding | 1 | 61 | 1.6% |
| PFNA: 10 ppt level; unrounded average ≥15 ppt after applying EPA rounding | 1 | 61 | 1.6% |
| HFPO-DA: 10 ppt level; unrounded average ≥15 ppt after applying EPA rounding | 0 | 61 | 0.0% |
| Hazard Index: 1 level; unrounded index ≥1.5 and at least two detected components | 2 | 61 | 3.3% |
System directory
Community water systems with complete monitoring
“Complete monitoring” means at least one sampling location had every required sample needed to calculate a yearly average. It does not mean every location or home was tested. Each PWSID appears once, preventing double counting across ZIP associations.
| Public water system | PWSID | Population served | Primary source | Sampling locations | EPA comparison result |
|---|---|---|---|---|---|
| AMERICAN FALLS CITY OF | ID6390001 | 4,863 | Ground water | 6 | No available average above comparison levels |
| AMMON CITY OF | ID7100004 | 17,338 | Ground water | 4 | No available average above comparison levels |
| AVONDALE IRRIGATION DIST | ID1280008 | 8,785 | Ground water | 4 | No available average above comparison levels |
| BLACKFOOT CITY OF | ID6060007 | 13,224 | Ground water | 7 | No available average above comparison levels |
| BUHL CITY OF | ID5420007 | 4,518 | Ground water | 5 | No available average above comparison levels |
| BURLEY WATER DEPT | ID5160008 | 10,345 | Ground water | 5 | No available average above comparison levels |
| CALDWELL CITY OF | ID3140013 | 74,000 | Ground water | 15 | No available average above comparison levels |
| CAPITOL WATER CORP | ID4010022 | 9,000 | Ground water | 4 | Above an EPA comparison level |
| CENTRAL SHOSHONE COUNTY WATER DIST | ID1400089 | 6,098 | Groundwater under influence of surface water | 2 | No available average above comparison levels |
| CHUBBUCK CITY OF | ID6030008 | 15,842 | Ground water | 5 | No available average above comparison levels |
| COEUR D ALENE CITY OF | ID1280053 | 54,115 | Ground water | 11 | No available average above comparison levels |
| COUGAR BAY WATER ASSOCIATION | ID1280309 | 230 | Ground water | 2 | No available average above comparison levels |
| EAGLE, CITY OF (EASTERN ZONE) | ID4010201 | 3,702 | Ground water | 2 | No available average above comparison levels |
| EAGLE, CITY OF (WESTERN ZONE) | ID4010222 | 6,108 | Ground water | 3 | No available average above comparison levels |
| EAST GREENACRES IRRIGATION DIST | ID1280064 | 11,165 | Ground water | 3 | No available average above comparison levels |
| EMMETT CITY OF | ID3230012 | 6,700 | Ground water | 3 | No available average above comparison levels |
| FALLS WATER COMPANY INC | ID7100030 | 22,650 | Ground water | 7 | No available average above comparison levels |
| FORT HALL | 101612109 | 2,850 | Ground water | 2 | No available average above comparison levels |
| FRUITLAND CITY OF | ID3380005 | 7,458 | Surface water | 1 | No available average above comparison levels |
| GARDEN CITY WATER AND SEWER SYSTEM | ID4010066 | 12,500 | Ground water | 8 | Above an EPA comparison level |
| GOODING CITY OF | ID5240009 | 3,706 | Ground water | 4 | No available average above comparison levels |
| GRANGEVILLE WATER DEPT | ID2250023 | 3,151 | Ground water | 5 | No available average above comparison levels |
| HAILEY WATER AND SEWER | ID5070022 | 8,000 | Ground water | 5 | No available average above comparison levels |
| HAYDEN LAKE IRRIGATION DIST | ID1280087 | 9,375 | Ground water | 6 | No available average above comparison levels |
| HEYBURN CITY OF | ID5340006 | 3,000 | Ground water | 3 | No available average above comparison levels |
| IDAHO FALLS CITY OF | ID7100039 | 69,450 | Ground water | 15 | No available average above comparison levels |
| JEROME CITY OF | ID5270011 | 13,135 | Ground water | 4 | No available average above comparison levels |
| KANIKSU SHORES ESTATES | ID1090065 | 93 | Ground water | 1 | No available average above comparison levels |
| KETCHUM CITY OF | ID5070028 | 3,555 | Ground water | 6 | No available average above comparison levels |
| KOOSKIA WATER DEPT | ID2250032 | 607 | Ground water | 2 | No available average above comparison levels |
| KUNA CITY OF | ID4010085 | 32,038 | Ground water | 5 | No available average above comparison levels |
| LEWISTON CITY OF | ID2350014 | 15,001 | Surface water | 6 | No available average above comparison levels |
| LEWISTON ORCHARDS IRRIGATION DIST | ID2350015 | 20,000 | Ground water | 2 | No available average above comparison levels |
| MCCALL CITY OF | ID4430033 | 4,423 | Surface water | 1 | No available average above comparison levels |
| MERIDIAN WATER DEPT | ID4010097 | 147,340 | Ground water | 24 | No available average above comparison levels |
| MIDDLETON CITY OF | ID3140074 | 13,190 | Ground water | 7 | No available average above comparison levels |
| MORELAND COUNTRY COURT | ID6060049 | 60 | Ground water | 2 | No available average above comparison levels |
| MOSCOW WATER DEPT | ID2290023 | 26,000 | Ground water | 5 | No available average above comparison levels |
| MOUNTAIN HOME AIR FORCE BASE | ID4200054 | 7,500 | Ground water | 3 | No available average above comparison levels |
| MOUNTAIN HOME CITY OF | ID4200032 | 14,651 | Ground water | 9 | No available average above comparison levels |
| NAMPA CITY OF | ID3140080 | 100,200 | Ground water | 13 | No available average above comparison levels |
| PAYETTE CITY OF | ID3380009 | 8,127 | Ground water | 7 | No available average above comparison levels |
| PIERCE CITY OF | ID2180027 | 467 | Surface water | 1 | No available average above comparison levels |
| POCATELLO CITY OF | ID6030043 | 58,231 | Ground water | 6 | No available average above comparison levels |
| POST FALLS CITY OF | ID1280147 | 20,285 | Ground water | 9 | No available average above comparison levels |
| POTLATCH CITY OF | ID2290030 | 812 | Ground water | 3 | No available average above comparison levels |
| PRESTON CITY OF | ID6210014 | 5,591 | Ground water | 1 | No available average above comparison levels |
| RATHDRUM CITY OF | ID1280152 | 10,358 | Ground water | 5 | No available average above comparison levels |
| REXBURG CITY OF | ID7330022 | 40,695 | Ground water | 4 | No available average above comparison levels |
| RIGBY CITY OF | ID7260032 | 5,400 | Ground water | 5 | No available average above comparison levels |
| ROSS POINT WATER DIST | ID1280163 | 8,965 | Ground water | 5 | No available average above comparison levels |
| RUPERT CITY OF | ID5340017 | 5,796 | Ground water | 3 | No available average above comparison levels |
| SANDPOINT PUBLIC WORKS DEPT | ID1090121 | 12,284 | Surface water | 2 | No available average above comparison levels |
| SHELLEY CITY OF | ID6060071 | 4,409 | Ground water | 4 | No available average above comparison levels |
| ST ANTHONY | ID7220067 | 3,606 | Ground water | 2 | No available average above comparison levels |
| STAR SEWER AND WATER DIST WATER SYSTEM | ID4010220 | 14,000 | Ground water | 4 | No available average above comparison levels |
| SUN VALLEY WATER AND SEWER DIST | ID5070051 | 3,400 | Ground water | 11 | No available average above comparison levels |
| TWIN FALLS CITY OF | ID5420058 | 56,121 | Ground water | 2 | No available average above comparison levels |
| UNIVERSITY OF IDAHO | ID2290042 | 8,589 | Ground water | 2 | No available average above comparison levels |
| Veolia Water ID | ID4010016 | 264,978 | Surface water | 10 | No available average above comparison levels |
| WEISER CITY OF | ID3440011 | 5,630 | Surface water | 1 | No available average above comparison levels |
How the count works
What is included
Each active community water system with enough required samples for a yearly average is counted once, even if it is linked with several ZIP codes. Private wells are excluded, and UCMR 5 did not comprehensively monitor every small system.