Thurston County · System ID 63381 · Community water system
Is Classic Heights’ water safe? PFAS test results (Thurston County, WA)
PFAS above Washington’s state action level
Classic Heights detected PFAS in 2 of its 2 tested water sources, with at least one result above Washington’s state action level (latest test May 2026).
Community water system serving Thurston County · 182 connections · about 480 people.
At least one individual sample measured at or above a federal MCL value (4 ng/L for PFOA/PFOS; 10 ng/L for PFHxS, PFNA, HFPO-DA). Compliance with the federal standard is judged on running annual averages at the tap — a single source sample at that level is a flag, not a violation.
PFAS results on record for Classic Heights
| Analyte | Highest result | WA action level | Federal MCL | Detected at source |
|---|---|---|---|---|
| PFPeA Perfluoropentanoic acid | 34 ng/L | — | — | WELL #1 AAF122, WELL #2 AAA963 - 96125/ WFE WELL #1 |
| PFHxA Perfluorohexanoic acid | 20 ng/L | — | — | WELL #1 AAF122, WELL #2 AAA963 - 96125/ WFE WELL #1 |
| PFOA Perfluorooctanoic acid | 12 ng/L above SAL | 10 ng/L | 4 ng/L | WELL #1 AAF122, WELL #2 AAA963 - 96125/ WFE WELL #1 |
| PFBS Perfluorobutanesulfonic acid | 6 ng/L | 345 ng/L | — | WELL #1 AAF122, WELL #2 AAA963 - 96125/ WFE WELL #1 |
| PFBA Perfluorobutanoic acid | 4 ng/L | — | — | WELL #1 AAF122, WELL #2 AAA963 - 96125/ WFE WELL #1 |
| PFHpA Perfluoroheptanoic acid | 2 ng/L | — | — | WELL #2 AAA963 - 96125/ WFE WELL #1 |
What this means
A Washington state action level (SAL) is the concentration at which the state requires a water system to notify its customers and take action — typically treating the affected source, blending it, or taking it offline. PFAS was detected in 2 of the 2 sources tested for this system, and at least one result was above a SAL. Ask the utility what it has done with the affected sources since the sample date — the table above shows which sources were affected.
For PFAS at the drinking tap, the fix 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: 2026-05-21. 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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