Here you will find information about the quality of Montana's rivers, streams, lakes, and wetlands in relation to Montana's Water Quality assessments. These assessments are derived from available statewide water monitoring data and information. The Clean Water Act Information Center also provides access to Montana's Water Quality Reports and List of Impaired Surface Waters, as well as online search and mapping tools.
Search water quality data
Use interactive map
View surface water assessment, water quality monitoring, TMDL planning areas and other data collected by interactive map
View Montana Water Quality Reports