State
Washington: drinking water records
EPA lists 2,410 community water systems serving homes in Washington. 245 took part in EPA's national PFAS survey (UCMR 5), and 68 found at least one PFAS above the level laboratories can measure.
In focus2,410community water systems
Public records. Clearer context.
0
ZIP reports published
2,410
community water systems
260
systems with a health-based violation since 2016
78
systems that reached the lead action level since 2016
Counties
- Adams County 31 systems
- Asotin County 2 systems
- Benton County 43 systems
- Chelan County 46 systems
- Clallam County 68 systems
- Clark County 25 systems
- Columbia County 5 systems
- Cowlitz County 31 systems
- Douglas County 23 systems
- Ferry County 19 systems
- Franklin County 32 systems
- Garfield County 3 systems
- Grant County 81 systems
- Grays Harbor County 41 systems
- Island County 233 systems
- Jefferson County 27 systems
- King County 155 systems
- Kitsap County 155 systems
- Kittitas County 37 systems
- Klickitat County 24 systems
- Lewis County 51 systems
- Lincoln County 16 systems
- Mason County 125 systems
- Okanogan County 46 systems
- Pacific County 19 systems
- Pend Oreille County 16 systems
- Pierce County 228 systems
- San Juan County 44 systems
- Skagit County 50 systems
- Skamania County 14 systems
- Snohomish County 127 systems
- Spokane County 93 systems
- Stevens County 36 systems
- Thurston County 199 systems
- Wahkiakum County 4 systems
- Walla Walla County 33 systems
- Whatcom County 106 systems
- Whitman County 19 systems
- Yakima County 96 systems
ZIP reports
Sources
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.