Puget Sound · WA DOH public data
Is your tap water safe? PFAS results for 2,855 Puget Sound water systems
Washington publishes PFAS test results for public water systems — but by system ID, in agency formats. We compiled them into plain-English pages: 1,294 systems tested so far in our ten counties, 302 with at least one detection, 25 above a Washington state action level. The rest haven’t reported results yet — unknown, not clean.
Fastest route: enter your address in the free checker and we’ll match it to your system. Or browse by county below. Data: WA Department of Health PFAS results, updated 2026-07-22 — per water source, not per tap; informational only, not health advice.
Thurston County
967 systems · 207 tested · 72 with detections · 5 above action level
Pierce County
406 systems · 228 tested · 84 with detections · 10 above action level
Island County
282 systems · 227 tested · 35 with detections · 1 above action level
Whatcom County
267 systems · 97 tested · 21 with detections · 2 above action level
Mason County
230 systems · 137 tested · 17 with detections · 1 above action level
Kitsap County
176 systems · 113 tested · 19 with detections · 2 above action level
Snohomish County
158 systems · 84 tested · 15 with detections
Lewis County
157 systems · 63 tested · 9 with detections · 1 above action level
King County
126 systems · 103 tested · 29 with detections · 3 above action level
Skagit County
86 systems · 35 tested · 1 with detections