City Water Quality Rankings in Montana
83 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#73
Glendive
County, MT
62 C
#74 Libby
County, MT
59 D
#75 Havre
County, MT
45 D
#76 Colstrip
County, MT
39 F
#77 Miles City
County, MT
36 F
#78 Virginia City
County, MT
25 F
#79 Chinook
County, MT
8 F
#80 White Sulphur Springs
County, MT
4 F
#81 Harlem
County, MT
0 F
#82 Philipsburg
County, MT
0 F
#83 Whitehall
County, MT
0 F
Frequently Asked Questions
How are city water quality rankings calculated in Montana?
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 Montana?
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.