County · Washington
Whitman County, Washington: drinking water records
This overview covers 20 ZIP codes and 19 community water systems in Whitman 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 |
|---|---|---|---|---|---|
| Pullman Water Department City of WA5369880 | 31,315 | 300 | 0 | 0 | 2.1 ppb |
| Washington State University WA5393200 | 21,506 | 240 | 0 | 0 | 4.9 ppb |
| Colfax Water Department City of WA5314000 | 3,507 | 180 | 0 | 0 | 3.8 ppb |
| Palouse Water Dept City of WA5365800 | 1,298 | 0 | 0 | 0 | 3.2 ppb |
| Tekoa City of WA5387300 | 1,076 | 0 | 0 | 0 | 1.4 ppb |
| Rosalia Town of WA5374250 | 831 | 0 | 0 | 0 | 3.8 ppb |
| St John Town of WA5375300 | 800 | 0 | 0 | 0 | 2.2 ppb |
| Garfield Water Department WA5327200 | 694 | 0 | 0 | 0 | 0 ppb |
| Colton Water Department WA5314100 | 632 | 0 | 0 | 0 | 4.1 ppb |
| Albion Water Dept WA5300800 | 600 | 0 | 0 | 0 | 0 ppb |
| Oakesdale Town of WA5362700 | 492 | 0 | 0 | 0 | 1.3 ppb |
| Endicott Water Dept WA5323400 | 488 | 0 | 0 | 0 | 1.1 ppb |
| Uniontown Water Works WA5390400 | 366 | 0 | 0 | 0 | 1.7 ppb |
| Lacrosse Town of WA5343400 | 297 | 0 | 0 | 0 | 0.7 ppb |
| Malden Water Dept WA5350550 | 215 | 0 | 0 | 0 | 0 ppb |
| Steptoe Water/Sewer District WA5324881 | 210 | 0 | 0 | 0 | 4.1 ppb |
| Farmington Water Dept WA5324700 | 165 | 0 | 0 | 0 | 0.5 ppb |
| Lamont Water System WA5345650 | 136 | 0 | 0 | 0 | 2.7 ppb |
| Sunset Mobile Court WA5386130 | 51 | 0 | 0 | 0 | 0.5 ppb |
ZIP reports in Whitman 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: 99136, 99174, 99176, 99333.
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.