City Water Quality Rankings in Colorado
186 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#145
Monte Vista
County, CO
68 C
#146 Woodland
County, CO
68 C
#147 Lasalle
County, CO
67 C
#148 Calhan
County, CO
66 C
#149 Wray
County, CO
66 C
#150 Del Norte
County, CO
64 C
#151 Dolores
County, CO
64 C
#152 Breckenridge
County, CO
63 C
#153 Florence
County, CO
62 C
#154 Administrative Contact
County, CO
61 C
#155 Winter Park
County, CO
60 C
#156 Julesburg
County, CO
58 D
#157 Rifle
County, CO
58 D
#158 Austin
County, CO
56 D
#159 Snowmass Village
County, CO
56 D
#160 Mancos
County, CO
53 D
#161 Cedaredge
County, CO
52 D
#162 Frisco
County, CO
52 D
#163 Nederland
County, CO
52 D
#164 Carbondale
County, CO
50 D
#165 Hayden
County, CO
50 D
#166 Strasburg
County, CO
49 D
#167 Norwood
County, CO
48 D
#168 Evergreen
County, CO
44 F
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.