August 2026 · Orevant Compliance Intelligence
Washington water system operators answer to two layers of regulation: the federal Safe Drinking Water Act (SDWA) enforced by the U.S. EPA, and state rules administered by the Washington State Department of Health (DOH) Office of Drinking Water under the Washington Administrative Code. A gap against either layer lands on your system's EPA SDWIS record — the same record a DOH inspector reviews before every sanitary survey.
Washington regulates roughly 4,000 Group A public water systems under WAC 246-290, plus thousands more Group B systems under WAC 246-291. Group A systems (15 or more connections, or 25 or more people served 60 or more days per year) carry the full monitoring and reporting burden. This guide focuses on Group A community water systems (CWS) and non-transient non-community (NTNC) systems — the operators with the highest obligations and the fewest staff.
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Community systems serving 25–1,000 people must collect at minimum one routine total coliform sample per month; larger systems have higher minimum frequencies. A positive routine sample triggers repeat sampling within 24 hours. Missed or late samples are the most common monitoring violation in Washington SDWIS data — and the most preventable.
The EPA's LCRI, finalized October 2024, required every community water system to submit a complete lead service line (LSL) inventory by the federal October 16, 2024 deadline. Under 40 CFR 141.84, service lines classified as "unknown" are treated as lead, triggering treatment technique requirements until the material is confirmed. Older communities across Washington with pre-1986 housing stock are at highest risk of incomplete inventories — and an incomplete inventory surfaces at your next sanitary survey as a significant deficiency.
The EPA PFAS National Primary Drinking Water Regulation (NPDWR), finalized April 2024, set MCLs of 4 ppt for PFOA and PFOS. There is no size exemption — every CWS and NTNC system must complete initial PFAS monitoring, with the initial monitoring window running through 2027 and MCL compliance required by 2029. Washington DOH has already conducted statewide PFAS sampling, and detections near airports, fire-training sites, and industrial areas have drawn enforcement attention.
Community water systems must distribute an annual CCR to all customers by July 1. The 2026 CCR adds mandatory disclosures: PFAS detection results (even below the MCL) and lead service line inventory status. A CCR that omits these elements — or wasn't distributed on time — is a reporting violation in SDWIS.
Washington's primary drinking water regulation is WAC 246-290, covering Group A public water supplies — from water quality standards and monitoring schedules to operator requirements and emergency response planning. DOH adds state-specific requirements on top of the federal floor, including routine monitoring frequencies and reporting through its Drinking Water Information System.
Washington requires water systems to have certified operators under WAC 246-292 (Waterworks Operator Certification). Certification levels correspond to system classification, and the certified operator must be current and on record with DOH. A lapsed certification — or failing to update DOH records after an operator change — is a routine sanitary survey finding and can trigger enforcement.
DOH conducts sanitary surveys of Group A systems on a schedule driven by system type and compliance history. The survey reviews source, treatment, storage, distribution, monitoring/reporting, and operator compliance. Uncorrected deficiencies from a prior survey become repeat findings with higher enforcement exposure at the next survey.
Your open violations, monitoring schedule, and inspection history are in the EPA SDWIS database; DOH also maintains public compliance history through its Drinking Water Watch portal. The fastest way to see your current federal status is a free lookup at orevant.com using your PWS ID — printed on any DOH correspondence. For the complete picture including DOH-specific obligations, the $199 compliance scan covers both federal SDWA and Washington-specific requirements for your system type and size.
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Yes. Washington-specific requirements including WAC 246-290 and WAC 246-292 are included alongside all applicable federal EPA standards.
We pull from EPA SDWIS regularly and map Washington-specific obligations for your system type and size.
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Orevant provides compliance information tools. Content on this page does not constitute legal advice. Compliance determinations should be verified with your state primacy agency.