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
476–500 of 569Scenic Shores Water Company
WA5376530 · 761 served
Northgate Terrace Community Club
WA5361750 · 750 served
Lewis Co Water Sewer Dist #6
WA5344240 · 740 served
Lake Holiday Association
WA5383600 · 740 served
Lost Lake Property Owners Assn
WA5348345 · 736 served
Stevens Co Pud - Clayton
WA5313450 · 725 served
Lynch Cove
WA5349100 · 721 served
Sun Cove Public Water System
WA5385124 · 716 served
Larch Corrections Center
WA5306461 · 705 served
Lyman Water Department
WA5349050 · 705 served
Union
WA5351920 · 700 served
Kittitas County Water District #5
WA5342704 · 699 served
Oak Park
WA5362675 · 695 served
Garfield Water Department
WA5327200 · 694 served
Mcneil Island Water
WA5352900 · 692 served
Grandview Condominiums
WA53AE050 · 679 served
Town of Cusick
WA5317000 · 672 served
Wilderness Ridge Community Club
WA5396876 · 664 served
Chinook Water District
WA5312800 · 664 served
Great Basin Water Burbank
WA5331477 · 656 served
Del Mar Community Service
WA5318580 · 654 served
Three Lakes Water District
WA5388140 · 650 served
City of Harrington
WA5331450 · 650 served
Vistaire Water System
WA5357414 · 647 served
Washington Soldiers Home Colony
WA5364700 · 643 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
Scenic Shores Water Company
Violation history, PFAS records, and official source links
Northgate Terrace Community Club
Violation history, PFAS records, and official source links
Lewis Co Water Sewer Dist #6
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