Here you will find information about the quality of Montana's rivers, streams, and lakes 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.
View information about the quality of Montana's rivers, streams, and lakes in relation to water quality standards.
View surface water assessment, water quality monitoring, Total Maximum Daily Load (TMDL) planning areas and other data collected by an Interactive Map