Washington drinking water compliance.
Public water systems in Washington must meet both federal Safe Drinking Water Act requirements and Washington's state drinking water program requirements.
Read the Washington Drinking Water Compliance Guide →
Who regulates water systems in Washington
Washington State Department of Health serves as the primacy agency for Washington public water systems.
Official state drinking water program →
Federal baseline requirements — coliform monitoring, lead and copper, disinfection byproducts, Consumer Confidence Reports, PFAS, and lead service line inventories — apply to Washington systems alongside state rules.
What Washington systems typically track
- Routine coliform sampling on a state-approved siting plan
- Lead and copper tap sampling and service line inventory updates
- Consumer Confidence Report delivery (community systems)
- Operator certification renewals
- PFAS monitoring under the 2024 federal rule
- Sanitary survey corrective actions
Water systems in Washington
City level compliance and funding guides for the largest public water systems in Washington.
Recent developments affecting Washington systems
| Update | Jurisdiction | Published |
|---|---|---|
| Emergency preparedness: EPA updates small-system incident response resources | Federal | Jul 29, 2026 |
| Disinfection byproducts: Stage 2 compliance monitoring reminders | Federal | Jul 21, 2026 |
| Cybersecurity guidance for water systems after Section 1433 assessments | Federal | Jul 08, 2026 |
| UCMR 6 planning: next unregulated contaminant monitoring cycle | Federal | Jun 10, 2026 |
| Operator certification: EPA training resources and state reciprocity | Federal | Jun 02, 2026 |
| EPA proposes extending PFOA/PFOS compliance deadline to 2031 | Federal | May 14, 2026 |
| Consumer Confidence Report (CCR) Rule revisions take effect | Federal | Apr 21, 2026 |
| Lead and Copper Rule Improvements (LCRI) final rule in effect | Federal | Mar 02, 2026 |
| America's Water Infrastructure Act: risk assessments cycle for large CWSs | Federal | Feb 17, 2026 |
| EPA Water System Restructuring Assessment authority now in effect | Federal | Feb 03, 2026 |
Find your Washington water system
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