County · Idaho
Kootenai County, Idaho: drinking water records
This overview covers 11 ZIP codes and 112 community water systems in Kootenai County. It also stands in for 0 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 |
|---|---|---|---|---|---|
| Post Falls City of ID1280147 | 20,285 | 540 | 0 | 1 | 1 ppb |
| Coeur D Alene City of ID1280053 | 54,115 | 660 | 1 | 0 | 2 ppb |
| East Greenacres Irrigation Dist ID1280064 | 11,165 | 180 | 0 | 0 | 3 ppb |
| Rathdrum City of ID1280152 | 10,358 | 300 | 2 | 0 | 1 ppb |
| Hayden Lake Irrigation Dist ID1280087 | 9,375 | 360 | 0 | 0 | 0 ppb |
| Ross Point Water Dist ID1280163 | 8,965 | 300 | 0 | 0 | 2 ppb |
| Avondale Irrigation Dist ID1280008 | 8,785 | 240 | 0 | 0 | 0 ppb |
| Dalton Water Assn INC ID1280059 | 2,602 | 0 | 0 | 1 | 6 ppb |
| Kootenai County Water Dist 1 ID1280106 | 843 | 0 | 0 | 2 | 9 ppb |
| Worley City of ID1280206 | 591 | 0 | 0 | 5 | 2 ppb |
| Cave Bay Community System ID1280041 | 458 | 0 | 0 | 1 | 2 ppb |
| Harrison City of ID1280083 | 456 | 0 | 0 | 1 | 6 ppb |
| Conkling Park Water Assn ID1280054 | 309 | 0 | 0 | 2 | 17 ppb |
| Rose Lake Water Assn ID1280161 | 300 | 0 | 0 | 1 | 0 ppb |
| Cougar Bay Water Association ID1280309 | 230 | 120 | 0 | 0 | 4 ppb |
| Upper Twin Lakes Water Company INC ID1280194 | 227 | 0 | 0 | 1 | 10 ppb |
| Woodland Shores Water and Sewer Assn ID1280203 | 210 | 0 | 0 | 2 | 2 ppb |
| Ohio Match Estates ID1280127 | 118 | 0 | 0 | 2 | 0 ppb |
| Highway 54 Water Association, INC ID1280221 | 100 | 0 | 0 | 1 | 0 ppb |
| Lake Forest Homes Assn INC ID1280109 | 98 | 0 | 0 | 1 | 5 ppb |
| Parkview Water Assn ID1280135 | 90 | 0 | 0 | 1 | 9 ppb |
| Ramsey Estates ID1280285 | 88 | 0 | 0 | 9 | 0 ppb |
| Mountain View at Farragut Park ID1280308 | 62 | 0 | 0 | 1 | 0 ppb |
| Gotham Bay Estates ID1280311 | 61 | 0 | 0 | 1 | 1 ppb |
| Gem State - Happy Valley Water System ID1280220 | 60 | 0 | 0 | 1 | 1 ppb |
ZIP reports in Kootenai County
No ZIP report in this county is published yet.
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.