Every two years, MPCA creates a list of impaired waters that do not meet water quality standards. Learn more: Defining impaired waters.
Stay informed. Have questions or need assistance? Sign up for updates or contact Miranda Nichols, 651-757-2614 or 800-657-3864 toll free.
Draft 2020 Impaired Waters List
Describes Minnesota's monitoring and assessment strategy, assessment tools, and the redesigned assessment process. The purpose of this guidance is to define the required data and information and lay out the criteria by which waterbodies are assessed to determine if beneficial uses are supported.
The comment period for the draft 2020 Impaired Waters List and Assessment Guidance Manual has closed (Nov. 12, 2019, through Jan. 14, 2020).
The MPCA is working on responses to comments. All comments received during that period, and agency responses, will be forwarded to EPA, along with the proposed list and accompanying documentation, for their review and approval on or before April 1, 2020.
See the Impaired Waters Viewer (IWAV) for all impaired waters, including those just listed, delisted, and corrected for the new list.
The MPCA held four public meetings to discuss the content of the 2020 Impaired Waters List with special focus on waters assessed in the region in the last two years. Meetings were recorded and posted here. Contact Miranda Nichols for additional information.
Central: December 11
Upper Mississippi River Basin except for the Twin Cities watershed
West: December 12
Basins: Missouri River, Des Moines River, Minnesota River, and Red River of the North
North: December 17
Basins: Rainy River and Lake Superior
Metro/Southeast: December 19
Basins: Mississippi River – Twin Cities watershed, and the St. Croix River, Lower Mississippi River, and Cedar River
- Webex: December 19
- Presentation: Metro/Southeast Minnesota Impaired Waters List public meeting (wq-iw1-65e)
Also known as the 305(b) Integrated Report, combines two requirements of the Clean Water Act to report to Congress on the quality of Minnesota's waters.
For GIS professionals: Go to MPCA's spatial data webpage to download shapefiles on Minnesota's impaired waters.