The Water Map

Montana

Montana drinking water quality

Every public water system in Montana we've verified. Each report covers one calendar year and shows the utility's own measured contaminant levels against federal limits.

Want the national picture? See where Montana lands in our ranking of the states with the most open health-based water violations, pulled from the EPA's own records for every U.S. public water system.

1,063 water systems mapped in Montana · showing the 800 with the most contaminant flags — explore them all on the map

Browse all 1,063 systems A–Z:123