City Water Quality Rankings in Washington
259 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#25
Maple Valley
County, WA
100 A
#26 Medical Lake
County, WA
100 A
#27 Moses Lake
County, WA
100 A
#28 Moxee
County, WA
100 A
#29 Mt Vernon
County, WA
100 A
#30 Mukilteo
County, WA
100 A
#31 Nas Whidbey Island
County, WA
100 A
#32 Newcastle
County, WA
100 A
#33 Newman Lake
County, WA
100 A
#34 Nooksack
County, WA
100 A
#35 North Bonneville
County, WA
100 A
#36 Okanogan
County, WA
100 A
#37 Palouse
County, WA
100 A
#38 Pasco
County, WA
100 A
#39 Prosser
County, WA
100 A
#40 Ridgefield
County, WA
100 A
#41 Sedro Woolley
County, WA
100 A
#42 Snoqualime
County, WA
100 A
#43 Steilacoom
County, WA
100 A
#44 Sumas
County, WA
100 A
#45 Tukwila
County, WA
100 A
#46 Twisp
County, WA
100 A
#47 Waitsburg
County, WA
100 A
#48 Washtucna
County, WA
100 A
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.