Municipal storm water permits

Important information concerning the DNR’s MS4 General Permits

The DNR is in the process of issuing WPDES MS4 general permits WI-S050075-2 and WI-S050181-1. The public comment period on the proposed MS4 general permits ended Friday, March 14, 2014. The DNR is in the process of responding to comments and finalizing the general permits. Information on the status of finalizing and issuing the general permits will be provided as it becomes available.

The DNR previously held a public informational webinar for each proposed general permit. A recording of each webinar is available.

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: Wednesday March 19 2014