City Water Quality Rankings in Washington
257 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#217
Mount Vernon
County, WA
91 A
#218 Vashon
County, WA
91 A
#219 Cashmere
County, WA
90 A
#220 Humptulips
County, WA
90 A
#221 Mattawa
County, WA
90 A
#222 Othello
County, WA
90 A
#223 Port Townsend
County, WA
90 A
#224 Spanaway
County, WA
90 A
#225 Stanwood
County, WA
90 A
#226 Auburn
County, WA
89 B
#227 Joyce
County, WA
89 B
#228 Republic
County, WA
89 B
#229 Roslyn
County, WA
89 B
#230 Wellpinit
County, WA
89 B
#231 Coupeville
County, WA
88 B
#232 Olympia
County, WA
87 B
#233 Point Roberts
County, WA
87 B
#234 Cathlamet
County, WA
86 B
#235 Kingston
County, WA
86 B
#236 Ocean Park
County, WA
85 B
#237 South Bend
County, WA
85 B
#238 Chelan
County, WA
84 B
#239 Oakville
County, WA
84 B
#240 Skokomish Nation
County, WA
84 B
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.