County · Idaho
Idaho County, Idaho: drinking water records
This overview covers 12 ZIP codes and 19 community water systems in Idaho County. It also stands in for 3 ZIP codes whose utility has too little EPA data for a page of its own.
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems with the most complete records
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| Grangeville Water Dept ID2250023 | 3,151 | 300 | 0 | 0 | 2 ppb |
| Cottonwood Water Dept ID2250013 | 977 | 0 | 0 | 1 | 1 ppb |
| Kooskia Water Dept ID2250032 | 607 | 120 | 0 | 0 | 0 ppb |
| Pine Ridge Water and Sewer Dist ID2250134 | 390 | 0 | 0 | 1 | 2 ppb |
| Elk City Water and Sewer Assn ID2250017 | 320 | 0 | 0 | 39 | 9 ppb |
| Ferdinand City of ID2250019 | 133 | 0 | 0 | 4 | 0 ppb |
| Country Court Community ID2250014 | 89 | 0 | 0 | 7 | 5 ppb |
| Clearwater Water Dist ID2250011 | 80 | 0 | 0 | 28 | 0 ppb |
| Valley View Water and Sewer District ID2250065 | 70 | 0 | 0 | 1 | 1 ppb |
| Riggins City of ID2250053 | 434 | 0 | 0 | 0 | 2 ppb |
| Idoc North Idaho Correctional Institute ID2250041 | 425 | 0 | 0 | 0 | 2 ppb |
| Stites City of ID2250060 | 253 | 0 | 0 | 0 | 1 ppb |
| Helena RV and Mobile Home Park MT0000426 | 250 | 0 | 0 | 0 | 12 ppb |
| Kamiah Valley Company LLC ID2250033 | 250 | 0 | 0 | 0 | 0 ppb |
| Monastery of St Gertrudes ID2250045 | 200 | 0 | 0 | 0 | 0 ppb |
| White Bird City of ID2250068 | 125 | 0 | 0 | 0 | 1 ppb |
| Rapid River Water & Sewer Dist ID2250050 | 120 | 0 | 0 | 0 | 1 ppb |
| Fenn Community System ID2250018 | 30 | 0 | 0 | 0 | 3 ppb |
| Village 21 Water Dist ID2250066 | 25 | 0 | 0 | 0 | 0 ppb |
ZIP reports in Idaho County
No ZIP report in this county is published yet.
These ZIP codes are covered by this overview because their utility has too little EPA data for a separate page: 83533, 83542, 83547.
Sources and scope
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Page generated 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.