County · Oklahoma
Washington County, Oklahoma: drinking water records
This overview covers 6 ZIP codes and 11 community water systems in Washington 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 |
|---|---|---|---|---|---|
| Bartlesville OK1021401 | 34,748 | 120 | 2 | 1 | 3.6 ppb |
| Dewey Public Works Authority OK3007402 | 3,490 | 240 | 1 | 4 | 2.6 ppb |
| Ramona Public Works Authority OK3007408 | 564 | 120 | 1 | 3 | 2.7 ppb |
| Washington Co Rwd #2 OK3007403 | 2,250 | 0 | 0 | 1 | 1.8 ppb |
| Washington Co Rwd #5 OK3007409 | 900 | 0 | 0 | 1 | 3.2 ppb |
| Le Ann Water OK3007407 | 750 | 0 | 0 | 3 | 1.2 ppb |
| Copan Pwa OK1021417 | 733 | 0 | 0 | 47 | 2.3 ppb |
| Ochelata Utility Authority OK3007414 | 494 | 0 | 0 | 1 | 0 ppb |
| Washington Co Rwd #7 OK3007415 | 258 | 0 | 0 | 11 | 4.7 ppb |
| Bar-Dew Water Assoc INC OK3007406 | 130 | 0 | 0 | 1 | 1.9 ppb |
| Washington Co Rwd #1 OK3007401 | 1,375 | 0 | 0 | 0 | 3.8 ppb |
ZIP reports in Washington 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.