Municipal stormwater: MS4 public notice process

The Minnesota Pollution Control Agency (MPCA) reissued the Authorization to Discharge Stormwater Associated with Small Municipal Separate Storm Sewer Systems (MS4) under the National Pollutant Discharge Elimination System/State Disposal System (NPDES/SDS) Permit MNR040000 (MS4 General Permit), effective August 1, 2013. The MS4 General Permit requires MS4 owners to develop and implement a stormwater pollution prevention program (SWPPP) to reduce the discharge of pollutants from their storm sewer system to the maximum extent practicable. In late 2013 and early 2014, the MPCA provided public notice of Part 2 of the Application (also known as the SWPPP Document) for 233 small MS4s regulated under the previous MS4 General Permit. It is the responsibility of the small MS4 owner and/or operator to comply with the requirements of the MS4 General Permit and their SWPPP Document.


As required by a 2003 Minnesota Court of Appeals ruling, the MPCA provides public notice and the opportunity for hearing on proposed SWPPP Documents. Owners and operators of regulated small MS4s must submit a complete SWPPP Document that includes best management practices for stormwater applicable to their MS4 and measurable goals to address the six minimum control measures described in the MS4 General Permit. The SWPPP Documents are the subject of this public notice process.

Process for public notice of SWPPPs

The following summarizes the process for public notice of SWPPP Documents. The MPCA provides public notice and opportunity for hearing on the SWPPP Documents in accordance with Minn. R. ch 7001 and the procedures of the MS4 General Permit.

  1. Submittal and Review of SWPPP Documents
    In the fall of 2016, the 21 new applicants submitted their SWPPP Documents. The MPCA MS4 staff review the SWPPP Documents for completeness, adequacy, and to make a preliminary determination to issue coverage to the applicant under the MS4 General Permit.
  2. Public notice of SWPPPs
    SWPPP Documents are public noticed on the MPCA Public Notices page after MPCA review is complete. Information on how to submit comments or petitions to the MPCA is provided in the public notice.
  3. Response to comments
    When the 30 day public notice period ends, the MPCA MS4 staff review all public comments and forward them to the appropriate MS4 applicant for consideration and resolution. The MS4 applicant is required to provide resolution of comments to MPCA MS4 staff.
  4. Issuance of MS4 permit coverage
    When the applicant satisfactorily addresses all public comments, MPCA staff make a final determination to issue permit coverage to the applicant.