City Water Quality Rankings in Colorado
186 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#97
Lakewood
County, CO
88 B
#98 Limon
County, CO
88 B
#99 Westcliffe
County, CO
88 B
#100 Aspen
County, CO
86 B
#101 Center
County, CO
86 B
#102 Conejos
County, CO
86 B
#103 Denver
County, CO
86 B
#104 Durango
County, CO
86 B
#105 Eagle
County, CO
85 B
#106 Flagler
County, CO
85 B
#107 Fort Carson
County, CO
85 B
#108 Milliken
County, CO
85 B
#109 Eaton
County, CO
84 B
#110 Kremmling
County, CO
84 B
#111 Thornton
County, CO
84 B
#112 Fraser
County, CO
83 B
#113 Wheat Ridge
County, CO
83 B
#114 Parachute
County, CO
82 B
#115 Cripple Creek
County, CO
81 B
#116 Lafayette
County, CO
81 B
#117 Minturn
County, CO
81 B
#118 Black Hawk
County, CO
80 B
#119 Sterling
County, CO
80 B
#120 Bennett
County, CO
79 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.