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Municipal storm water permits

Important information concerning the MS4 program

MS4 general permit reissued
The DNR has reissued WPDES Municipal Separate Storm Sewer System (MS4) General Permit No. WI–S050075–3, effective May 1, 2019, which replaces previous coverage under expired WPDES MS4 General Permits No. WI–S050075–2 and WI–S050181–1.
WPDES MS4 General Permit WI–S050075–3 [PDF]
Response to Comments [PDF]
Final Determination [PDF]
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.


  • Permit overview
    Municipal permit program information
  • Find permit information
    Look up municipal permittees
  • Publications/technical guidance
    Obtain technical guidance on storm water management planning and practices, and find guidance on grass swales and rain gardens
  • Standards/models
    Find information on technical standards for management practices, SLAMM model, P8 Model, MS4 modeling guidance and West Nile Virus concerns with storm water management
  • Presentations
    View presentations from past workshops on municipal storm water management
  • Grants
    Learn about grants to municipalities for planning and constructing storm water projects and download application materials
  • MS4 eReporting
    Municipal permittees are required to submit an annual/biennial reports and permit compliance documents to the DNR to document progress and compliance with the permit requirements.
  • Who’s Pond is it Anyway?
  • DNR storm water contacts
Last revised: Wednesday May 01 2019