State Hub
Washington Water Quality
569
Utilities in database
9.2M
Residents served
0
With open violations
233
PFAS monitored
Quick Answer
Washington public drinking water is served by 569 EPA-tracked water systems, providing service to approximately 9.2 million residents through public utilities. No open health-based violations are currently recorded across tracked systems in the EPA federal database. 233 systems have official PFAS monitoring records from the EPA UCMR 5 program (2023–2025). About 22% of WA residents use private wells, which fall outside federal utility compliance monitoring.
No open health-based violations are currently recorded in the EPA SDWIS database for Washington's tracked water systems. Always verify with your utility's Consumer Confidence Report for annual test results.
Drinking Water in Washington
Washington has 569 community water systems serving approximately 9.2 million residents. Primary water sources include groundwater. The most commonly reported contaminants include disinfection byproducts, lead. 22% of Washington residents rely on private wells. DOH holds primary enforcement authority under the Safe Drinking Water Act.
Safest Large Utilities
Washington systems with no open health violations serving 10,000+ residents.
Utilities in Washington
51–75 of 569North City Water District
WA5339600 · 32,847 served
City of Moses Lake
WA5356300 · 32,428 served
Spanaway Water Company
WA5382850 · 31,908 served
Camas Municipal Water Sewer System
WA5310800 · 31,794 served
Mukilteo Water & Wastewater Distr
WA5357550 · 31,437 served
City of Pullman Water Department
WA5369880 · 31,315 served
City of Mercer Island
WA5353640 · 31,057 served
City of Battle Ground Water Dept
WA5304700 · 30,237 served
Parkland Light & Water Company
WA5366200 · 29,595 served
Fife Dept of Public Works
WA5325050 · 29,091 served
West Sound Utility District #1
WA5302600 · 28,930 served
Cedar River Water & Sewer District
WA5341800 · 28,671 served
Centralia Public Works - Water
WA5312200 · 28,164 served
City of Port Angeles
WA5368550 · 28,067 served
Whitworth Water District 2
WA5396601 · 26,883 served
East Wenatchee Water District
WA5321800 · 26,519 served
City of Mountlake Terrace
WA5357250 · 26,402 served
Cross Valley Water District
WA5316270 · 24,695 served
Vera Water & Power
WA5391450 · 24,692 served
North Perry Ave Water District
WA5360950 · 24,402 served
Lake Meridian Water District
WA5341900 · 24,231 served
City of Oak Harbor
WA5362650 · 23,767 served
Monroe Water System
WA5355820 · 23,467 served
Enumclaw Water Department
WA5323600 · 23,276 served
City of Anacortes
WA5302200 · 22,995 served
Key Contaminant Concerns in Washington
These contaminants appear most frequently in Washington utility records or pose elevated risk in this region based on EPA data.
Lead
Lead is a naturally occurring heavy metal that was widely used in plumbing infrastructure until it was banned for new installations in 1986. An estimated 9.2 million lead service lines still connect homes to public water mains across the United States, along with millions of homes with lead solder in their internal plumbing. Critically, a utility's water quality report can show zero detected lead at the treatment plant while your specific tap still delivers elevated lead — because the contamination happens inside the distribution system and your home's plumbing, not at the source.
EPA limit: 15 ppb (action level)
DBPs
When utilities add chlorine to water to kill pathogens, it reacts with dissolved organic matter — leaves, algae, soil — to produce disinfection byproducts (DBPs). Over 600 DBPs have been identified. The EPA regulates two groups: total trihalomethanes (TTHMs, including chloroform) and haloacetic acids (HAA5). DBP levels tend to be highest in surface water systems and in warm months when organic matter is elevated.
EPA limit: 80 µg/L (TTHMs) / 60 µg/L (HAA5)
City Water Reports in Washington
Tap water quality pages for Washington cities — violations, PFAS records, utility profiles, and official source links.
Washington PFAS Watchlist — all utilities with official recordsIndependent Water Testing
Find a certified lab in Washington
Utility compliance records show what water systems report to the EPA. An independent test from a certified laboratory confirms what's actually in your tap water. Washington labs can test for PFAS, lead, nitrates, bacteria, and dozens of other contaminants.
Explore Water Quality in Washington
North City Water District
Violation history, PFAS records, and official source links
City of Moses Lake
Violation history, PFAS records, and official source links
Spanaway Water Company
Violation history, PFAS records, and official source links
PFAS monitoring records — Washington
233 water systems in Washington with EPA UCMR 5 records
Lead in Washington drinking water
State-specific lead data, violation utilities, and testing guidance
PFAS in Washington drinking water
State-specific PFAS data, MCL context, and treatment options
Certified water testing labs in Washington
Labs certified for PFAS (EPA 533/537.1), lead, and bacteria testing
Water treatment options
Reverse osmosis, activated carbon, and filtration guides with cost ranges
Data sources and methodology
How WaterUtilityReport.com sources and validates official EPA data
Common Questions About Washington Drinking Water
Does Washington drinking water have PFAS?
233 Washington water systems have EPA UCMR 5 PFAS monitoring records (2023–2025)
Which Washington water utilities have open violations?
Browse Washington utility compliance records and violation history
How do I test my water in Washington?
State-certified labs for PFAS (EPA 533/537.1), lead, nitrate, and bacteria testing
What treatment removes PFAS from WA tap water?
Reverse osmosis removes PFAS, lead, arsenic, and nitrates — cost, maintenance, and NSF certification explained
What do Washington PFAS records tell me about my water?
EPA limits, health context, and what UCMR 5 detection above MRL means for your water
How is Washington water quality data sourced here?
EPA SDWIS violations, UCMR 5 PFAS records, and CCR data — sources, accuracy notes, and limitations
Washington Water FAQs
Data sources: Utility compliance and violation data from EPA SDWIS (Safe Drinking Water Information System). PFAS monitoring records from EPA UCMR 5 (Unregulated Contaminant Monitoring Rule 5, 2023–2025). Contaminant data from EPA and ATSDR public references. This page summarizes public records — it is not a compliance determination. Methodology →
Last updated: 2026-04-18