Washington tap water
20 of 239 Washington water systems with full PFAS testing (8%) averaged above a 2024 federal PFAS level at one or more sampling points.
- 2,309 active community water systems in the EPA file; 216 serve 3,300+ people and have a full PFAS set.
- 144 systems had at least one health-based violation since 2021-10-26.
- 24 systems report a lead 90th percentile above 15 ppb (some results are old; check each system page).
Largest systems
| System | People served | PFAS above a 2024 level? | Health-based violations since 2021-10-26 |
|---|---|---|---|
| Seattle Public Utilities | 1,161,961 | No | 0 |
| Tacoma Water Division City of | 446,245 | No | 0 |
| Vancouver City of | 373,047 | Yes, at one or more sampling points | 0 |
| Spokane City of | 346,138 | No | 0 |
| Bellevue City of | 321,349 | No | 0 |
| Alderwood Water District | 245,715 | No | 0 |
| Everett Public Works dept. City of | 215,774 | No | 0 |
| Kent Water department | 166,421 | No | 0 |
Counties
King County39 systems with full PFAS testingPierce County28 systems with full PFAS testingSpokane County22 systems with full PFAS testingSnohomish County18 systems with full PFAS testingKitsap County16 systems with full PFAS testingYakima County11 systems with full PFAS testing
All 43 utilities with a page in Washington
- Alderwood Water District 245,715
- Auburn City of 107,655
- Bellevue City of 321,349
- Bellingham-Water Division City of 141,127
- Bonney Lake Water department City 43,371
- Bremerton City of 72,951
- Clark Public Utilities 153,526
- Covington Water District 56,172
- Everett Public Works dept. City of 215,774
- Highline Water District 100,170
- Issaquah Water System 43,584
- Kennewick City of 118,164
- Kent Water department 166,421
- King County Water District #20 48,469
- Kirkland City of 69,243
- Lacey Water department 105,178
- Lakehaven Water and Sewer District 148,809
- Lakewood Water District 82,425
- Longview Water department 57,617
- Lynnwood City of 68,204
- Marysville Utilities 88,582
- Northshore Utility District 99,789
- Olympia City of 126,966
- Pasco Water department 115,102
- Puyallup City of 94,520
- Redmond Water System City of 163,335
- Renton City of 108,091
- Richland City of 106,499
- Sammamish Plateau Water & Sewer 79,362
- Seattle Public Utilities 1,161,961
- Silver Lake Water & Sewer District 65,033
- Skagit County Pud 1 Judy Res 111,415
- Sno Pud 1 - Lake Stevens 67,710
- Soos Creek Water & Sewer District 74,172
- Southwood 64,155
- Spokane City of 346,138
- Tacoma Water Division City of 446,245
- Tumwater City of 51,924
- Vancouver City of 373,047
- Walla Walla Water Division 42,959
- Wenatchee City of 43,690
- Woodinville Water District 66,699
- Yakima Water Division City of 112,858
Why not "the state's water quality"? You drink from one utility, not a state. Rollups count systems, not people, so one large utility counts the same as a small one. Use the system pages for your actual water.
Not medical or legal advice. UCMR 5 results are screening data, not compliance determinations.
Sources and freshness
Public-water-system facts, violations and lead/copper results: EPA ECHO SDWA download (SDWIS snapshot 2026-10-13). PFAS and lithium results: EPA UCMR 5 final data (sampling 2023–2025). Both are U.S. government works, downloaded 2026-10-26. Numbers are computed by the published method; the same fields are in the open data files.