Municipal storm water permits

Important information concerning the DNR’s MS4 General Permits

Effective May 1, 2014, the DNR has issued WPDES MS4 general permits WI-S050075-2 and WI-S050181-1.

WEPA Compliance Determination under s. NR 150.35(2), Wis. Adm. Code: The Department of Natural Resources has determined that the reissuance of WPDES MS4 General Permit No. WI-S050075-2 and the issuance of WPDES MS4 General Permit No. WI-S050181-1 are prior compliance actions under s. NR 150.20(3)(a)8., Wis. Adm. Code, and do not require additional environmental analysis under ch. NR 150, Wis. Adm. Code, because of prior environmental analysis documentation for ch. NR 216, Wis. Adm. Code, and WPDES MS4 General Permit No. WI-S050075-1.

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 11 2014