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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#49
Berthoud
County, CO
94 A
#50
Dacono
County, CO
94 A
#51
Fountain
County, CO
94 A
#52
Greeley
County, CO
94 A
#53
Keystone
County, CO
94 A
#54
Lakewood
County, CO
94 A
#55
Platteville
County, CO
94 A
#56
Usaf Academy
County, CO
94 A
#57
Wiggins
County, CO
94 A
#58
Arvada
County, CO
93 A
#59
Littleton
County, CO
93 A
#60
Silverthorne
County, CO
93 A
#61
Watkins
County, CO
93 A
#62
Westminster
County, CO
93 A
#63
Windsor
County, CO
93 A
#64
Aurora
County, CO
92 A
#65
Bayfield
County, CO
92 A
#66
Craig
County, CO
92 A
#67
Crestone
County, CO
92 A
#68
Denver
County, CO
92 A
#69
Frederick
County, CO
92 A
#70
Georgetown
County, CO
92 A
#71
Limon
County, CO
92 A
#72
Montrose
County, CO
92 A

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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