City Water Quality Rankings in Washington
257 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#241
Waterville
County, WA
84 B
#242 Kennewick
County, WA
83 B
#243 Tulalip
County, WA
83 B
#244 Seattle
County, WA
82 B
#245 Gig Harbor
County, WA
81 B
#246 Pasco
County, WA
78 B
#247 Arlington
County, WA
69 C
#248 Naches
County, WA
65 C
#249 Westport
County, WA
61 C
#250 Suquamish
County, WA
60 C
#251 Mesa
County, WA
58 D
#252 Deer Park
County, WA
55 D
#253 Marshall
County, WA
49 D
#254 Ashford
County, WA
46 D
#255 Taholah
County, WA
45 D
#256 Neah Bay
County, WA
0 F
#257 Ritzville
County, WA
0 F
Frequently Asked Questions
How are city water quality rankings calculated in Washington?
WaterQ city rankings are based on EPA SDWIS data across local public water systems, including contaminant detections, compliance violations, and recency-weighted score signals.
Can I compare two cities in Washington?
Yes. Use the city comparison links on this page or open the Compare tool to evaluate two cities side by side on score, grade, and water system coverage.
How often does WaterQ refresh city data?
City-level metrics refresh when new EPA data is processed. Check city pages for latest score and violation context.