County · Washington
Walla Walla County, Washington: drinking water records
This overview covers 8 ZIP codes and 33 community water systems in Walla Walla 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 |
|---|---|---|---|---|---|
| Walla Walla Water Division WA5392500 | 42,959 | 120 | 0 | 27 | 4.4 ppb |
| College Place Water Dept WA5314050 | 8,147 | 300 | 0 | 0 | 2.1 ppb |
| Snake River Housing Water System WA5300710 | 3,036 | 120 | 0 | 0 | 0 ppb |
| Great Basin Water Burbank WA5331477 | 656 | 0 | 0 | 5 | 0 ppb |
| Dixie Water Association WA5319480 | 240 | 0 | 0 | 1 | 0 ppb |
| Westbourne Acres WA5395047 | 94 | 0 | 0 | 3 | 6.7 ppb |
| Prospect Heights Comm Water Assn WA5369700 | 40 | 0 | 0 | 1 | 15 ppb |
| Waitsburg City of WA5392250 | 1,817 | 0 | 0 | 0 | 1.7 ppb |
| Consolidated Irrigation Dist 14 WA5314650 | 1,555 | 0 | 0 | 0 | 0 ppb |
| Walla Walla University WA5392470 | 1,273 | 0 | 0 | 0 | 0 ppb |
| Valle Lindo Homes WA5392475 | 787 | 0 | 0 | 0 | 0 ppb |
| Veterans Affair Med Ctr Dept of WA5390542 | 785 | 0 | 0 | 0 | 1 ppb |
| Green Tank Irr District 11 WA5329550 | 553 | 0 | 0 | 0 | 0.6 ppb |
| Burbank Irrigation District 4 WA5309300 | 527 | 0 | 0 | 0 | 0 ppb |
| Prescott Town of WA5369250 | 522 | 0 | 0 | 0 | 1.2 ppb |
| Columbia View Water System WA5314176 | 500 | 0 | 0 | 0 | 1.1 ppb |
| Arlenes Addition WA5302942 | 480 | 0 | 0 | 0 | 2.2 ppb |
| Artesian Water District 8 WA5303150 | 302 | 0 | 0 | 0 | 1.5 ppb |
| Hydro Irrigation District No 9 WA5335275 | 260 | 0 | 0 | 0 | 0 ppb |
| Blalock Orchard Dist 10 WA5307350 | 250 | 0 | 0 | 0 | 0 ppb |
| Wallula Water District WA5392600 | 200 | 0 | 0 | 0 | 0 ppb |
| Blalock Orchards Dist 12 WA5307400 | 193 | 0 | 0 | 0 | 3 ppb |
| Sun Harbor Water District #3 WA5385129 | 187 | 0 | 0 | 0 | 0.4 ppb |
| Burbank Heights WA5309350 | 177 | 0 | 0 | 0 | 2.8 ppb |
| Sydney Heights Water Assn WA5386647 | 130 | 0 | 0 | 0 | 0 ppb |
ZIP reports in Walla Walla 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: 99360.
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.