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Salish Water WorksPuget Sound · Water Treatment

Puget Sound PFAS results · county hub

Is King County’s tap water safe? PFAS results, system by system

Of the 126 public water systems with mapped service areas in King County, Washington, 103 have reported PFAS testing in the state’s public dataset, 29 had at least one PFAS detection, and 3 had a result above a Washington state action level. 23 systems have no public PFAS results yet — their status is unknown, not clean.

Source: Washington State Department of Health public PFAS results and Drinking Water Service Areas, dataset updated 2026-07-22. Results describe each system’s sources, not individual taps. Informational only — not health advice. Not sure which system serves you? Check your address free.

3Above a Washington state action level

At least one PFAS result above a level at which the state requires customer notification and action.

26PFAS detected — below state action levels

PFAS present in at least one tested source; all results below Washington’s action levels.

74No detections in tests to date

No PFAS detections in the sources and analytes tested so far — scope-limited, not a blanket all-clear.

23Not yet tested for PFAS

No public PFAS results yet. Unknown is not the same as clean — smaller systems are still working through the state’s testing schedule.

Why "waitlist" and not "book now": Salish Water Works is completing its Washington contractor registration (RCW 18.27). Until that's done, we don't offer, bid, or perform installation work, and nothing here is for sale. The waitlist is free and non-binding — it just holds your place for launch.

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← PFAS results for all ten Puget Sound counties