WaterQ

City Water Quality Rankings in Washington

257 cities ranked by drinking water quality.

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Popular city water quality comparisons

Anderson Island, WA vs Asotin, WA Compare → Bainbridge Island, WA vs Bellevue, WA Compare → Blaine, WA vs Bridgeport, WA Compare → Burien, WA vs Clarkston, WA Compare →

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#49
Colfax
County, WA
99 A
#50
Colville
County, WA
99 A
#51
Connell
County, WA
99 A
#52
Dupont
County, WA
99 A
#53
Elma
County, WA
99 A
#54
Entiat
County, WA
99 A
#55
Ferndale
County, WA
99 A
#56
Goldendale
County, WA
99 A
#57
Granger
County, WA
99 A
#58
Greenacres
County, WA
99 A
#59
Joint Base Lewis-Mcchord
County, WA
99 A
#60
Langley
County, WA
99 A
#61
Mabton
County, WA
99 A
#62
Monroe
County, WA
99 A
#63
Montesano
County, WA
99 A
#64
Mountlake Terrace
County, WA
99 A
#65
North Bend
County, WA
99 A
#66
Packwood
County, WA
99 A
#67
Renton
County, WA
99 A
#68
Rochester
County, WA
99 A
#69
Rock Island
County, WA
99 A
#70
Sammamish
County, WA
99 A
#71
Tenino
County, WA
99 A
#72
Toledo
County, WA
99 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.

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