Municipal Separate Storm Sewer System (MS4) permittees must submit annual reports to the MPCA. Permittees provide information about their MS4 activities, including education efforts, inspections, enforcement, trainings, progress towards Total Maximum Daily Load (TMDL) waste load allocations (WLAs), and more. There will be no MS4 annual report submission by June 30, 2024. Please read below for more details.

MS4 Annual Report Update

The MPCA is in the process of developing a new e-service for the MS4 annual report. All MS4 permittees covered by the 2020 MS4 General Permit will not need to submit an annual report for calendar year 2022 and 2023, by June 30, 2024. Instead, annual reporting is deferred until the e-service is available.

As part of the e-service development, the MPCA is updating many annual report questions to align with the requirements in the 2020 MS4 General Permit and meet the requirements of the federal National Pollutant Discharge Elimination System (NPDES) Electronic Reporting Rule. The MPCA will communicate to MS4 permittees when the new e-service becomes available.

To best prepare for resuming annual report submittal when the e-service becomes available, MS4 permittees covered by the 2020 MS4 General Permit should ensure they are tracking information required in permit item 25.3, which includes:

  1. Status of compliance with permit requirements (Example: Permittee indicates whether they have the regulatory mechanisms required in Minimum Control Measures 3, 4, and 5)
  2. Documentation required in Sections 13-24 of the permit (Examples: Education and outreach activities, public participation events, number of construction site inspections conducted, number and types of enforcement tools issued, training events, number of inspections conducted for ponds, outfalls, and structural stormwater BMPs, etc.)
  3. Best management practices (BMPs) implemented to make progress towards achieving applicable WLAs and associated pollutant loading reductions. This includes a status update of the BMPs included in the permittee’s WLA compliance schedule, which was submitted as part of the permit application. See the TMDL annual report webpage for more information.
  4. Any partnerships with other MS4 permittees
  5. Changes made to the permittee’s Stormwater Pollution Prevention Program (SWPPP) over the reporting year
  6. The permittee’s plans for the next reporting year

View questions in the MS4 Annual Report for 2021 (outdated--for reference only)

The file below is an example of questions contained in the old version of the MS4 annual report which reflects the requirements of the 2013 MS4 General Permit. The document is for historical reference purposes only.

File:MS4 question worksheet for 2021 annual report.docx

Questions about the annual report?

Contact Cole Landgraf (

For questions related to the TMDL annual report, contact Anna Bosch (

This page was last edited on 23 January 2024, at 19:34.