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
76–100 of 569City of Aberdeen
WA5300050 · 22,867 served
Pud #1 of Asotin County
WA5393343 · 21,930 served
King County Water District #125
WA5341998 · 21,904 served
Washington State University
WA5393200 · 21,506 served
City of Washougal
WA5393400 · 21,441 served
City of West Richland
WA5394900 · 21,231 served
Ridgefield Public Works
WA5372400 · 21,225 served
Consolidated Irrig Dist 19 System 2
WA5310221 · 21,220 served
Ellensburg Water Dept
WA5322950 · 20,900 served
City of Arlington
WA5302950 · 20,418 served
King County Water District No 90
WA5341150 · 20,100 served
Ferndale
WA5324850 · 19,305 served
Spo Co Water Dist 3 Sys 1
WA5393351 · 18,983 served
Modern Electric Water Co
WA5355600 · 18,487 served
City of Poulsbo
WA5369150 · 18,400 served
Lynden Water Department
WA5349150 · 17,969 served
City of Sunnyside
WA5385400 · 17,194 served
Eastern Washington University
WA5321900 · 17,108 served
City of Port Townsend
WA5369000 · 17,053 served
City of Cheney
WA5312400 · 16,954 served
Naval Base Kitsap at Bangor
WA5302714 · 16,828 served
City of Yelm
WA5399350 · 16,733 served
Naval Air Station/whidbey Island
WA5303420 · 16,595 served
Gig Harbor Water Dept
WA5327600 · 16,510 served
North Peninsula
WA5305122 · 16,449 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
City of Aberdeen
Violation history, PFAS records, and official source links
Pud #1 of Asotin County
Violation history, PFAS records, and official source links
King County Water District #125
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