City Water Quality Rankings in Colorado
186 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#121
Palmer Lake
County, CO
79 B
#122 Ordway
County, CO
78 B
#123 Bennett
County, CO
76 B
#124 Creede
County, CO
76 B
#125 Las Animas
County, CO
76 B
#126 Mount Crested Butte
County, CO
76 B
#127 Silverton
County, CO
76 B
#128 Sterling
County, CO
76 B
#129 Yuma
County, CO
75 B
#130 Log Lane Village
County, CO
74 C
#131 Pagosa Springs
County, CO
74 C
#132 Akron
County, CO
73 C
#133 Conifer
County, CO
73 C
#134 Johnstown
County, CO
73 C
#135 Poncha Springs
County, CO
73 C
#136 Idaho Springs
County, CO
72 C
#137 Olathe
County, CO
72 C
#138 Trinidad
County, CO
72 C
#139 Fort Lupton
County, CO
71 C
#140 Louisville
County, CO
71 C
#141 New Castle
County, CO
71 C
#142 Towoac
County, CO
71 C
#143 Manitou Springs
County, CO
70 C
#144 Wellington
County, CO
70 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.