WaterQ

City Water Quality Rankings in Colorado

186 cities ranked by drinking water quality.

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Popular city water quality comparisons

Clifton, CO vs Commerce City, CO Compare → Edgewater, CO vs Erie, CO Compare → Federal Heights, CO vs Firestone, CO Compare → Gilcrest, CO vs Gunnison, CO Compare →

Trending Cities

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#73
Niwot
County, CO
92 A
#74
Ault
County, CO
91 A
#75
Buena Vista
County, CO
91 A
#76
Canon City
County, CO
91 A
#77
Evans
County, CO
91 A
#78
Monument
County, CO
91 A
#79
Dillon
County, CO
90 A
#80
Lamar
County, CO
90 A
#81
Palisade
County, CO
90 A
#82
Springfield
County, CO
90 A
#83
Fort Morgan
County, CO
89 B
#84
Hillrose
County, CO
89 B
#85
Parker
County, CO
89 B
#86
Rangely
County, CO
89 B
#87
Superior
County, CO
89 B
#88
Thornton
County, CO
89 B
#89
Colorado Springs
County, CO
88 B
#90
Cortez
County, CO
88 B
#91
Durango
County, CO
88 B
#92
Englewood
County, CO
88 B
#93
Larkspur
County, CO
88 B
#94
Penrose
County, CO
88 B
#95
Severance
County, CO
88 B
#96
Vail
County, CO
88 B

Frequently Asked Questions

How are city water quality rankings calculated in Colorado?

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 Colorado?

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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