The Municipal Separate Storm Sewer System (MS4) Annual Report must be submitted to the MPCA by June 30th of each calendar year, as required by the MS4 General Permit.

In 2014, the MS4 Annual Report was reformatted to be an online questionnaire, accessible by a login username and password. You must click the 'Submit' button on the final page of the questionnaire to submit your responses to the MPCA. After you submit your MS4 Annual Report, please allow up to three business days to receive a confirmation email from the MPCA.

MS4 Annual Report for 2021

The MPCA released the Annual Report in February 2022. On February 7, 2022, the login information to access the Annual Report was emailed to each MS4 General Contact. This email is from the sender, "MPCA MS4 Permit Program" (, with the subject line, "MS4 Annual Report for 2021 – Login Information." Click the link in the email to access the login page for the MS4 Annual Report for 2021 (the link is also available below). If you are unable to find your login information, contact one of these MS4 staff.

Permittees may access the MS4 Annual Report for 2021 login webpage here.

If you have been assigned a Waste Load Allocation (WLA) in a Total Maximum Daily Load (TMDL) that was approved by the USEPA prior to August 1, 2013, and were not meeting that WLA(s) at the time of your permit application, you must also fill out your TMDL Annual Report Form and upload it to the online questionnaire when prompted. Guidance for the TMDL Annual Report Form is available here.

Note: The annual report questions remain unchanged from the previous annual report because MS4 permittees were covered under the 2013 MS4 Permit for the majority of 2021. In the next annual report, permittees will be required to report on activities completed to meet requirements under the 2020 MS4 Permit.

View all possible annual report questions

For your convenience, you may view a complete list of questions for the MS4 Annual Report for 2021. As you complete the online questionnaire, you may not see all of the questions listed here.

File:MS4 question worksheet for 2021 annual report.docx

Saving a copy of your annual report

See the page Guidance for saving MS4 annual reports

Questions about the annual report?

Contact Cole Landgraf (, 651-757-2880).

For questions related to the TMDL Annual Report Form, contact Anna Bosch (, 218-316-3929)