City Water Quality Rankings in Washington
259 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#241
Point Roberts
County, WA
88 B
#242 White Salmon
County, WA
88 B
#243 Tulalip
County, WA
87 B
#244 Cathlamet
County, WA
86 B
#245 Kingston
County, WA
86 B
#246 Chelan
County, WA
84 B
#247 Skokomish Nation
County, WA
84 B
#248 Oakville
County, WA
83 B
#249 Gig Harbor
County, WA
82 B
#250 Kennewick
County, WA
82 B
#251 Seattle
County, WA
82 B
#252 Mesa
County, WA
81 B
#253 Arlington
County, WA
77 B
#254 Naches
County, WA
67 C
#255 Suquamish
County, WA
67 C
#256 Westport
County, WA
64 C
#257 Ashford
County, WA
46 D
#258 Taholah
County, WA
41 F
#259 Neah Bay
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.