City Water Quality Rankings in Montana
83 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#49
Cut Bank
County, MT
88 B
#50 Troy
County, MT
88 B
#51 Polson
County, MT
87 B
#52 Boulder
County, MT
86 B
#53 Harlowton
County, MT
86 B
#54 Hungry Horse
County, MT
86 B
#55 Deer Lodge
County, MT
85 B
#56 Helena
County, MT
85 B
#57 Malta
County, MT
85 B
#58 Poplar
County, MT
85 B
#59 Ronan
County, MT
85 B
#60 Roundup
County, MT
85 B
#61 East Helena
County, MT
84 B
#62 Hingham
County, MT
84 B
#63 Browning
County, MT
83 B
#64 Forsyth
County, MT
80 B
#65 Lame Deer
County, MT
80 B
#66 Malmstrom Air Force Base
County, MT
80 B
#67 Crow Agency
County, MT
79 B
#68 Fairview
County, MT
78 B
#69 Hardin
County, MT
74 C
#70 White Sulphur Springs
County, MT
72 C
#71 Box Elder
County, MT
70 C
#72 Pablo
County, MT
68 C
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.