Monitoring Requirements for PFAS begin January 2023

Group A Community and non-transient non-community (NTNC) water systems are required to monitor for PFAS beginning January 2023. See our webpage, PFAS in Drinking Water—Monitoring and Analysis. Systems must collect samples at the entry point to the distribution system and have them analyzed by EPA Method 537.1 or 533 by a lab accredited for these analytes in Washington state.

Each water system’s Water Quality Monitoring Schedule lists the PFAS monitoring requirement starting in 2023. PFAS Monitoring and Follow Up Actions 331-668 outlines the monitoring requirements in the revised rule.

Transient non-community (TNCs) systems may be required to monitor if their source of supply is near a known PFAS contaminated site. We will notify affected TNCs when more information is known.

DOH still has a free PFAS sample program for Community and NTNC systems, continuing through early 2023. Results count toward state-required monitoring.
Water systems not currently signed up for this sampling program, can still sign up by email. We invited them to reach out to us with their interest in the program. Funding is limited. We may prioritize systems based on risk if volunteer systems exceed available funding.

Systems with detections must collect follow-up samples and comply with rule requirements. See PFAS in Drinking Water—Monitoring and Analysis for additional details.