Washington
Water Quality Report
94 Excellent
Average Score
94/100
Water Systems
480
Population
9.4M
Violations
1230 321 unresolved
Score Distribution
230 A
24 B
1 C
2 D
3 F
Top Contaminant Violations
| Contaminant | Violations |
|---|---|
| Copper (90th percentile) | 2 |
| Lead (90th percentile) | 2 |
Lowest Scoring Water Systems
0
Trident Seafoods Corp. Akutan F
AK2261193 Seattle, WA 1,400 served
17
Kopachuck Middle & Voyager Elem Ws F
WA5305549 Gig Harbor, WA 1,150 served
28
Badger Mountain Irrigation District F
WA5322617 Kennewick, WA 2,331 served
51
River Rock Tobacco And Fuel D
105338114 Arlington, WA 2,117 served
57
Angel Of The Winds D
105311105 Arlington, WA 2,303 served
Counties in Washington
Cities in Washington
View all 257 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 94/100 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.