City Water Quality Rankings in Colorado
186 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#121
Mosca
County, CO
79 B
#122 Palmer Lake
County, CO
79 B
#123 Florence
County, CO
78 B
#124 Idaho Springs
County, CO
78 B
#125 Las Animas
County, CO
78 B
#126 Manitou Springs
County, CO
78 B
#127 Ordway
County, CO
78 B
#128 Akron
County, CO
77 B
#129 Johnstown
County, CO
77 B
#130 Olathe
County, CO
77 B
#131 Creede
County, CO
76 B
#132 Mt Crested Butte
County, CO
76 B
#133 Fort Lupton
County, CO
75 B
#134 Redvale
County, CO
75 B
#135 Log Lane Village
County, CO
74 C
#136 Pagosa Springs
County, CO
74 C
#137 Carbondale
County, CO
73 C
#138 Silverton
County, CO
73 C
#139 Boulder
County, CO
72 C
#140 Trinidad
County, CO
72 C
#141 Louisville
County, CO
71 C
#142 New Castle
County, CO
71 C
#143 Wellington
County, CO
71 C
#144 Wray
County, CO
71 C
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.