Washington
Water Quality Report
95 Excellent
Average Score
95/100
Water Systems
480
Population
9.1M
Violations
0 all resolved
Score Distribution
1 A
2 B
1 C
0 D
0 F
Top Contaminant Violations
Lowest Scoring Water Systems
Counties in Washington
Cities in Washington
View all 259 cities →Popular City Comparisons in Washington
Quickly compare major cities in Washington by water quality score and grade.
Frequently Asked Questions
Is tap water in Washington safe to drink?
Washington has an average WaterQ score of 95/100 across 480 public water systems. Safety can vary by city and system, so check your local report for recent violations and contaminants.
How many water systems are in Washington?
WaterQ currently tracks 480 public water systems in Washington.
Where can I compare cities in Washington?
Use the city list below to open detailed reports, or visit the compare tool to benchmark two cities side-by-side on score, grade, and system coverage.