Miles City, MT vs Missoula, MT

When comparing tap water quality between Miles City, MT and Missoula, MT, Missoula currently holds a substantial 58-point lead in average WaterQ score, with a score of 94 out of 100 versus 36 for Miles City. Miles City, MT carries an F grade while Missoula, MT carries an A. A WaterQ score reflects an aggregate of EPA-reported violations, monitoring data, and compliance history across all public water systems serving each city, so a higher score generally indicates fewer recent violations and a stronger compliance record, though it does not guarantee that every tap in the city tests identically.

Missoula, MT is the larger of the two, with 78,563 more residents than Miles City. Missoula is served by 6 public water systems, compared with 1 in Miles City — a difference of 5 systems. A larger number of systems often reflects a more fragmented distribution network spanning multiple utilities, suburbs, or rural service areas, while a single large utility serving a big population can benefit from economies of scale in treatment and monitoring, but may also face more complex, aging infrastructure to maintain.

For residents of either Miles City or Missoula, the most useful next step is to look up the specific water system that serves your address, since city-wide averages combine results from every system in the area. Visit the Miles City or Missoula city pages below for a breakdown of local systems, recent violations, and contaminant-specific data, or browse WaterQ's contaminants directory to learn what each measured substance means for health.