Washington Water Quality Ratings
TapWaterSafety has rated 39 public water systems in Washington, serving a combined 7,178,219 residents. The statewide average grade is D.
State average grade
D
Total utilities rated
39
Population served
7,178,219
Most recent test
2024
🇪🇺 Would fail EU standards
1 of 39
Top water quality concerns in Washington
- Haloacetic acids (HAA9) significantly above health guideline
- Haloacetic acids (HAA5) significantly above health guideline
- Total trihalomethanes (TTHMs) significantly above health guideline
- Arsenic significantly above health guideline
- PFAS contamination
Cities in Washington
Browse tap water quality reports by city. Click any city to see its grade, what's in the water, and recommended filters.
Grade distribution
All rated utilities in Washington
Sorted by score, highest first. Click any utility to see the full grade card.