Municipalities affected by NR 216 Phase II Storm Water Rules

Municipalities included under Automatic (Urbanized Area) Nationwide Designation

The federal Phase II Final Rule requires nationwide coverage of Municipal Separate Storm Sewer Systems (MS4s) that are located within the boundaries of a Bureau of the Census-defined urbanized area based on the latest decennial Census. There are 16 urbanized areas in Wisconsin that include about 220 designated cities, villages, towns and counties.

• List of 16 urbanized areas and designated communities
• 20 municipalities with populations over 10,000

  NR 216 requires storm water permit coverage of all MS4s serving a population over 10,000 that are located outside of an urbanized area.

• EPA Web Sites

  Maps that determine automatic designation [exit DNR].
  federal requirements of the MS4 Phase II revisions [exit DNR]