County · Washington
Grant County, Washington: drinking water records
This overview covers 14 ZIP codes and 81 community water systems in Grant County. It also stands in for 1 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 |
|---|---|---|---|---|---|
| Mattawa City of WA5352000 | 5,370 | 60 | 0 | 1 | 0 ppb |
| Warden City of WA5392850 | 4,674 | 240 | 0 | 1 | 0 ppb |
| Moses Lake City of WA5356300 | 32,428 | 1,080 | 5 | 0 | 3.2 ppb |
| Ephrata Water Department WA5323650 | 8,718 | 300 | 0 | 0 | 0 ppb |
| Quincy Water Department City of WA5370450 | 8,415 | 300 | 0 | 0 | 2.5 ppb |
| Pelican Point By Cascadia LLC WA5366800 | 1,357 | 0 | 0 | 1 | 0 ppb |
| Weiler-Martin Tracts Water Assn WA5394110 | 1,163 | 0 | 0 | 1 | 0 ppb |
| Parker Spring Acres Water Assoc WA5322881 | 255 | 0 | 0 | 10 | 0.7 ppb |
| Hartline Water System WA5331500 | 249 | 0 | 0 | 1 | 3 ppb |
| Grove Terrace MHP Two LLC WA5308520 | 220 | 0 | 0 | 2 | 0 ppb |
| Golden Valley Water Assn WA5328400 | 138 | 0 | 0 | 8 | 0 ppb |
| Beverly Water District WA5306350 | 120 | 0 | 0 | 2 | 0 ppb |
| T-11 Farmworker Housing WA53AC293 | 99 | 0 | 0 | 1 | 0 ppb |
| Mt View Water System WA5357000 | 44 | 0 | 0 | 4 | 1.7 ppb |
| Royal City Water WA5374700 | 3,389 | 0 | 0 | 0 | 1.2 ppb |
| Desert Aire Owner Assn WA5319056 | 2,856 | 0 | 0 | 0 | 1 ppb |
| Soap Lake Water Dept WA5381300 | 2,399 | 0 | 0 | 0 | 0 ppb |
| Electric City City of WA5322850 | 1,812 | 0 | 0 | 0 | 2.6 ppb |
| Sunland Estates Homeowners Assn WA5385240 | 1,480 | 0 | 0 | 0 | 0 ppb |
| Grand Coulee Water Dept City of WA5328700 | 1,428 | 0 | 0 | 0 | 0 ppb |
| Lakeview Park Water Assn WA5345350 | 1,259 | 0 | 0 | 0 | 0 ppb |
| Basin Water Sources INC WA5304600 | 1,158 | 0 | 0 | 0 | 0 ppb |
| Crescent Bar System WA5315950 | 1,108 | 0 | 0 | 0 | 0.5 ppb |
| George City of WA5327395 | 1,035 | 0 | 0 | 0 | 0 ppb |
| Sunserra at Crescent Bar WA53AA745 | 1,000 | 0 | 0 | 0 | 0 ppb |
ZIP reports in Grant 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: 98853.
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.