WaterQ

City Water Quality Rankings in Colorado

186 cities ranked by drinking water quality.

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Popular city water quality comparisons

Avondale, CO vs Basalt, CO Compare → Clifton, CO vs Commerce City, CO Compare → Edgewater, CO vs Erie, CO Compare → Federal Heights, CO vs Firestone, CO Compare →

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#25
Holyoke
County, CO
98 A
#26
Kersey
County, CO
98 A
#27
La Junta
County, CO
98 A
#28
Peyton
County, CO
98 A
#29
Pierce
County, CO
98 A
#30
Rocky Ford
County, CO
98 A
#31
Grand Junction
County, CO
97 A
#32
Greeley
County, CO
97 A
#33
Greenwood Village
County, CO
97 A
#34
Broomfield
County, CO
96 A
#35
Burlington
County, CO
96 A
#36
Centennial
County, CO
96 A
#37
Crested Butte
County, CO
96 A
#38
Deer Trail
County, CO
96 A
#39
Delta
County, CO
96 A
#40
Elizabeth
County, CO
96 A
#41
Falcon
County, CO
96 A
#42
Glendale
County, CO
96 A
#43
Gypsum
County, CO
96 A
#44
Loveland
County, CO
96 A
#45
Mesa Verde
County, CO
96 A
#46
Byers
County, CO
95 A
#47
Copper Mountain
County, CO
95 A
#48
Windsor
County, CO
95 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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