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In 2006, Brown County was required to facilitate a Municipal Separate Storm Sewer System (MS4) permit that was issued by the Department of Natural Resources (WDNR). The purpose of the permit was to reduce storm water pollution from municipal storm water systems that are connected to streams, rivers, and lakes in the State of Wisconsin. The permit is on a five-year cycle, with reporting and specific activites completed annually during the permit period.

Brown County's MS4 permit includes county owned land (mostly county highway right-of-way) within the Urbanized Area of Brown County, based on the 2010 Census. The following is a link to a map of the Brown County Urbanized Area. 
Urbanized Area Map

MS4 permits include specific components to facilitate improved water quality. Two components include public education and public involvement. This web page was created to diseminate various components of the permit to the public. The components include:
  1. Public Education and Outreach
  2. Public Involvement and Participation
  3. Illicit Discharge and Elimination
  4. Construction Site Pollutant Control
  5. Post-Construction Storm Water Management
  6. Pollution Prevention Practices for the Municipality
  7. Developed Urbanized Area Standard
  8. Storm Sewer System Maps (Brown County does not maintain a storm sewer system as part of its highway facilities)
Brown County's annual MS4 report (below) details what the county is doing for the applicable components. 
water flowing through concrete culvert culvert with trash blocking the flow of water
Public Education Tip of the Month:
Northeast Wisconsin Stormwater Consortium - Vehicle Maintenance Website 
  • Visit the public education resources available on the NEWSC.org web site.
  • Consider Northeast Wisconsin Stormwater Consortium (NEWSC) membership. Work together with 53 other municipalities and consultants when developing your MS4 permit.
  • Seek advice from the WDNR and Environmental Protection Agency (EPA) web sites.

ProgramsMS4 Ordinances
Current MS4 Outfall Maps
The following links are to the Brown County MS4 Outfall Maps.
Annual MS4 Report
2023 Annual Report
2023 Annual Report Public Meeting Notice - April 12, 2024

MS4 Maps