Reissuing the municipal stormwater general permit

The municipal stormwater general permit (also called the MS4 general permit) must be reissued every five years. The current permit has expired and the MPCA has drafted a proposed new permit.

MPCA has posted the comments submitted during the public comment period (Nov. 12, 2019, through Jan. 11, 2020). The MPCA is in the process of reviewing these comments and plans to provide written responses by summer 2020.

Resources

The agency has compiled some resources to assist interested parties.

PDF icon Draft municipal stormwater general permit - highlighted version (wq-strm4-93c)

Draft municipal stormwater general permit with the requirements that the MPCA finds notable highlighted, such as requirements where additional specificity was included from the 2013 MS4 General Permit.

PDF icon Draft municipal stormwater general permit - redline version (wq-strm4-93)

Shows where edits were made to the permit language since the release of the early draft of the permit, from May 7, 2019 through June 6, 2019.

PDF icon Summary of significant new requirements in the draft MS4 general permit (wq-strm4-93d)

A high-level overview of new requirements in the draft MS4 general permit.

PDF icon Summary: Response to comments on early draft MS4 permit (wq-strm4-93a)

Overview of common themes in and MPCA responses to comments on the early draft MS4 General Permit

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

Flowchart to assist in complying with MCM 5: Post-construction stormwater management, a requirment of the municipal stormwater general permit

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

Applicable waste load allocations for each municipality covered by the municipal stormwater general permit


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

Informational webinar

HTML icon Video: Informational webinar on the draft MS4 General Permit (Dec. 11)

The MPCA held an interactive webinar in December 2019, providing an overview of new draft permit requirements and answers to questions to ensure the expectations of the new requirements are clear.