# Washington — PFOS — PFAS drinking water concentration limits by US state — MCLs, notification levels, action levels, and health advisories for PFOA, PFOS, and other per- and polyfluoroalkyl substances

For Washington, state–chemical pair is Washington — PFOS; pfas compound is PFOS; concentration limit (ppt) is 15; regulation type is notification level; stricter than federal mcl is no, recorded from its source on 2026-08-14.

- **State–chemical pair:** Washington — PFOS
- **State:** Washington
- **PFAS compound:** PFOS _(verified: appears in the quote below)_
- **Concentration limit (ppt):** 15 _(verified: appears in the quote below)_
- **Regulation type:** notification level
- **Stricter than federal MCL:** no _(our reading, not quoted from the source)_
- **Regulatory citation:** WAC 246-290

## What the source says

> Concentration level 15 ppt Chemical(s) and type of regulation PFOS (Notification)

## Source

- https://www.bclplaw.com/en-US/events-insights-news/pfas-drinking-water-standards-state-by-state-regulations.html

Last verified: 2026-08-14. Review by: 2027-02-10.
Part of [PFAS drinking water concentration limits by US state — MCLs, notification levels, action levels, and health advisories for PFOA, PFOS, and other per- and polyfluoroalkyl substances](https://referencesource.org/pfas-drinking-water-limits-by-state/).