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Guidance for Investigating and Remediating PFAS Contamination in Washington State

Publication number Date Published Date Revised
22-09-058December 2022June 2023
VIEW NOW Guidance for Investigating and Remediating PFAS Contamination in Washington State (Number of pages: 195) (Publication Size: 1997KB)
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Author(s) Mark Gordon, P.E., Toxics Cleanup Program
Description This guidance is intended for people and companies that are responsible for investigating and cleaning up PFAS contamination.

PFAS are per- and polyfluorinated compounds that consist of thousands of unique synthetic organic chemicals that are extremely stable and persistent in the environment. This guidance provides information and direction on:

* Known PFAS impacts across Washington * Soil and groundwater cleanup levels * Sampling options for PFAS compounds * Approaches to minimize cross-contamination * Protective concentrations for ecological receptors * Field demonstrated treatment technologies.

Background: The Washington State Department of Ecology works to prevent and clean up contamination that can threaten human health and the environment. We do this work under Washington’s environmental cleanup law called the Model Toxics Control Act (MTCA). In June 2022, we concluded that PFAS compounds fall under MTCA and any PFAS releases need to be assessed for cleanup. This guidance gives potentially liable persons, cleanup project managers, and consultants a practical approach for cleaning up PFAS contamination at Washington sites under MTCA.


June 28, 2023: Published final guidance.
Dec 15, 2022-March 3, 2023: Draft for public comment. In January and February 2023, we extended the original comment period twice.

The mission of the Department of Ecology is to protect, preserve, and enhance Washington’s environment. To help us meet that goal, please consider the environment before you print or request a copy.

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Contact Toxics Cleanup Program at 360-407-7170
Keywords Aqueous Film Forming Foam (AFFF), Per- and polyfluoroalkyl substances (PFAS), Model Toxics Control Act (MTCA), cleanup levels, drinking water, sampling, groundwater, soil screening levels, groundwater screening levels, state action levels (SALs), Washington State Department of Health
WEB PAGE PFAS at cleanup sites

Focus on: PFAS Cleanup Levels

Focus on PFAS