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Storm Water Management

Municipal Separate Storm Sewer System-MS4

The Municipal Separate Storm Sewer System (MS4) permit was created by the Minnesota Pollution Control Agency (MPCA) in order to comply with the Clean Water Act. Minnesota Rule 7090.1010 requires that cities with populations over 10,000 people must apply for coverage under the state general permit.

The City was granted coverage under the permit. The City Storm Water Pollution Prevention Plan (SWPPP) was approved along with the SWPPP.

The City of North Mankato's Erosion & Sediment Control Requirements:

MS4 Program Information:

The City of North Mankato's Enforcement Response Procedures (ERPs):

Stormwater Materials:

Snow Removal Tips to Improve Water Quality by Salt & Sand Reduction:

MPCA Video on Winter Maintenance for Small Sites












City of North Mankato MS4 and SWPPP Information:

Ordinance Chapter 54: Stormwater (Updated with Ordinance No. 82 on December 5, 2016)

MS4 SWPPP Application Reauthorization

Keep Our Lakes and Rivers Clean

Questions or comments concerning Storm Water and Erosion and Sediment Control issues, contact:


Public Works Director Nate Host


(507) 625-4141