Pierce County · System ID 26300 · Community water system
Is Fox Island Mutual Water Assoc’s water safe? PFAS test results (Pierce County, WA)
PFAS detected — below state action levels
Fox Island Mutual Water Assoc detected PFAS in 4 of its 10 tested water sources; every result in the current state dataset (2021–present) is below Washington’s state action levels (latest test August 2025).
Community water system serving Pierce County · 1,396 connections · about 3,255 people.
PFAS results on record for Fox Island Mutual Water Assoc
| Analyte | Highest result | WA action level | Federal MCL | Detected at source |
|---|---|---|---|---|
| PFHxA Perfluorohexanoic acid | 22 ng/L | — | — | WELL 14 |
| PFPeA Perfluoropentanoic acid | 22 ng/L | — | — | WELL 14 |
| PFBS Perfluorobutanesulfonic acid | 14 ng/L | 345 ng/L | — | WELL 11, WELL 14, WELL 22, WELLS 11 & 22 |
| PFBA Perfluorobutanoic acid | 4 ng/L | — | — | WELL 14 |
| PFHxS Perfluorohexanesulfonic acid | 4 ng/L | 65 ng/L | 10 ng/L | WELL 11, WELL 22, WELLS 11 & 22 |
What this means
PFAS was detected in 4 of the 10 sources tested for this system, and every result in the current state dataset (2021–present) is below Washington’s state action levels — the thresholds at which the state requires customer notification and action. Detected-but-below-action-level is exactly what it sounds like: PFAS is present in at least one source at low levels, and the state does not currently require the utility to act on it.
If you’d rather not drink detectable PFAS at any level, the at-the-tap option we plan to offer is under-sink reverse osmosis — manufacturer test data shows RO membranes reduce PFAS. See the planned systems.
These results describe the water system’s sources (wells, intakes), not any individual tap — utilities blend, treat, and rotate sources. Data: Washington State Department of Health public PFAS results and Drinking Water Service Areas, dataset updated 2026-07-22. Latest test on record for this system: 2025-08-04. Informational only — not a certification of water quality and not health advice. If you have concerns about your drinking water, contact your utility or the WA DOH Office of Drinking Water.
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