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Municipal storm water permits

Important information concerning the MS4 program

MS4 general permits expire April 30, 2019
Section NR 216.09, Wis. Adm. Code, and the general permits require municipalities to re-apply 180 days prior to the expiration date of their general permit. For continued general permit coverage, municipalities must re-apply to the department via letter by November 1, 2018.
MS4 program updates webinar recording
The webinar held on September 12, 2018, provided a statewide summary of MS4 annual reports and proposed MS4 general permit revisions relating to the EPA Remand and eReporting Rules.
Storm water pond

Bioswales capture runoff for infiltration (DNR photo)

More than two hundred municipalities in Wisconsin that include cities, villages, towns and counties within urbanized areas are required to have Municipal Separate Storm Sewer System (MS4) permits under NR 216, Wis. Adm. Code [exit DNR]. Use the links below to find out who is affected, how municipalities comply with permit requirements, and technical assistance documents. Learn more about storm water runoff.


Last revised: Thursday September 13 2018