2020 MS4 general permit

The issuance date of the new MS4 General Permit (MNR040000) is November 16, 2020.

PDF icon 2020 MS4 General Permit (wq-strm4-94)

For reference only: PDF icon Expired -  2013 MS4 general permit (wq-strm4-59k)

Applying for the permit

Existing MS4 permittees will have 150 days (April 15, 2021) to complete and submit the permit application forms.

Application materials

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Application requirements and process

In the permit application forms, MS4 permittees will need to describe:

  • Current stormwater pollution prevention program (SWPPP)
  • Status of meeting permit requirements in the six minimum control measures (MCMs)
  • Best management practices (BMPs) to address total maximum daily load (TMDL) waste load allocations (WLAs)
  • Names or position titles responsible for implementing each required component of the SWPPP

Once an MS4 permittee completes the permit application, they must submit it to the MPCA for preliminary review. If the application is incomplete, MPCA staff will notify the MS4 permittee of the deficiencies in writing. If MPCA staff determine the application is complete, the application will go on public notice for 30 days. Once the MS4 permittee has addressed any applicable public comments or hearing requests, the MPCA will make a final determination and issue coverage under the new permit. The MS4 permittee has 12 months from the date coverage is extended to meet the new permit requirements.


Use the MS4 mapping tool to view MS4 boundaries, defined urban areas, impaired waters, outstanding resource value waters, trout waters, and approved TMDL study areas. Note: This is best viewed with pop-up blockers disabled and screen resolution set to 1024x768 or higher.

PDF icon 2020 MS4 general permit - highlighted version (wq-strm4-94a)

The 2020 MS4 General Permit with "highlighting" of requirements that the MPCA finds notable, such as new requirements or where additional specificity was included from the 2013 MS4 General Permit.

PDF icon Responses to comments on the draft MS4 General Permit (wq-strm4-96)

PDF icon Minimum control measure (MCM) 5 flowchart (wq-strm4-92)

Flowchart to assist in complying with MCM 5: Post-construction stormwater management, a requirement of the 2020 MS4 General Permit.

File 2020 Municipal stormwater permit TMDL wasteload allocations list (wq-strm4-93b)

Approved waste load allocations for each municipality that will be covered by the 2020 MS4 General Permit.

The Minnesota Stormwater Manual also has multiple guidance documents related to permit requirements.