County · Washington
Ferry County, Washington: drinking water records
This overview covers 9 ZIP codes and 19 community water systems in Ferry County. It also stands in for 4 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 |
|---|---|---|---|---|---|
| Inchelium Water District WA5335550 | 540 | 0 | 0 | 1 | 0 ppb |
| Nespelem Agency 105300007 | 445 | 0 | 0 | 1 | 0.8 ppb |
| Omak Hud 105300008 | 380 | 0 | 0 | 7 | 0 ppb |
| Keller 105300006 | 340 | 0 | 0 | 5 | 6.5 ppb |
| Rocky River Road Community Site 105300047 | 260 | 0 | 0 | 7 | 0 ppb |
| Lakeside Park WA5333489 | 180 | 0 | 0 | 4 | 1 ppb |
| Orient Water Company WA5364300 | 167 | 0 | 0 | 56 | 5 ppb |
| Seatons Grove 105300115 | 115 | 0 | 0 | 3 | 2.8 ppb |
| Martin Creek Community Assn WA5351877 | 108 | 0 | 0 | 10 | 0 ppb |
| Malott 105300033 | 95 | 0 | 0 | 6 | 0 ppb |
| Twin Lakes Hud 105300010 | 42 | 0 | 0 | 6 | 2.0 ppb |
| Republic City of WA5371900 | 1,673 | 0 | 0 | 0 | 2.2 ppb |
| Curlew Conservation Center WA53FS165 | 349 | 0 | 0 | 0 | 3.6 ppb |
| Curlew Water & Sewer District WA5316900 | 316 | 0 | 0 | 0 | 0.9 ppb |
| Curlew Kai Homeowner Water System WA5310581 | 133 | 0 | 0 | 0 | 8.7 ppb |
| North Twin Lakeview Assn WA5361480 | 88 | 0 | 0 | 0 | 33.3 ppb |
| New Horizons Mobile/Rv Park CA1000259 | 82 | 0 | 0 | 0 | 2.8 ppb |
| Riverwood Water System WA5373032 | 43 | 0 | 0 | 0 | 2 ppb |
| Fourth of July Creek Estates WA5331989 | 29 | 0 | 0 | 0 | not reported |
ZIP reports in Ferry 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: 99121, 99140, 99146, 99150.
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.