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All 4 cities ranked by water quality score
How Washington's 4 cities are distributed by water quality grade
4 out of 4 cities meet or exceed a B grade for water quality
The best water quality in Washington is found in Seattle with a score of 95/100 and a grade of A+. This puts Seattle among the top-performing cities in the country for drinking water safety.
The most concerning water quality is in Vancouver scoring 95/100 with a grade of A+. Residents may want to consider home water testing and filtration options.
The statewide average score is 95/100, which is 23 points above the national average of 72/100. A strong majority (100%) of Washington cities exceed the national average, indicating generally good water infrastructure across the state.
Seattle has the best water quality in Washington with a score of 95/100 and a grade of A+. This score is based on contaminant levels, EPA compliance history, and infrastructure quality. Seattle ranks among the top cities nationally for water quality.
Water quality varies across Washington. The state average score is 95/100. 100% of Washington cities have good water quality (grade B or better). All cities in Washington maintain at least a C-grade, though individual results can vary by neighborhood and home plumbing. Always check your specific city's water quality report for the most accurate local information.
Of the 4 cities tracked in Washington, 0 cities have a D or F grade, indicating significant water quality concerns. 4 out of 4 cities (100%) score above the national average of 72/100. Residents concerned about their water quality can check their city's detailed report for specific contaminant information.
State water quality summary and key statistics
Top 20 cities with the cleanest water
Top-ranked cities nationwide
Cities with the most concerning water
Compare water quality across all 50 states
Side-by-side water quality comparison