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MS4 Permits - 2010 Census Urbanized Area Maps
The MS4 program requires a permit to discharge from an MS4 located in an urbanized area with a qualifying population. The Census Bureau updated the urbanized area boundaries to reflect the 2010 Census. The Department completed maps delineating each urbanized area in Michigan. These maps are used to assist with identifying which MS4s are located in an urbanized area and may require coverage by an MS4 permit. In Michigan, MS4 permittees may include cities, townships, villages, county agencies, universities, and school districts. Most permittees are covered under a general permit based on their storm water management approach, either jurisdictionally-based or watershed-based.
- Ann Arbor
- Battle Creek
- Bay City
- Benton Harbor - St. Joseph
- Elkhart Indiana - Michigan
- Grand Rapids
- Michigan City Indiana - Michigan
- Port Huron
- South Bend, Indiana, Michigan
- South Lyon - Howell - Brighton
- Toledo Ohio - Michigan