Prior Lake Spring Lake Watershed District
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Home» Projects and Programs » Municipal Separate Storm Sewer System (MS4)

Municipal Separate Storm Sewer System (MS4)

Storm Water Pollution Prevention Plan (SWPPP)

Municipal Separate Storm Sewer Systems (MS4s) are required to develop and implement a Stormwater Pollution Prevention Plan (SWPPP) to reduce the discharge of pollutants from their storm sewer system to the maximum extent practicable. The SWPPP must cover six minimum control measures: Public Education & Outreach, Public Participation/Involvement, Illicit Discharge Detection & Elimination, Construction Site Runoff & Control, Post-Construction Stormwater Management, Pollution Prevention/Good Housekeeping.

The MS4 must identify best management practices (BMPs) and measurable goals associated with each minimum control measure. An annual report on the implementation of the SWPPP must be submitted each year.  (excerpted from MPCA).

The Minnesota Pollution Control Agency (MPCA) issued coverage under the Small Municipal Separate Storm Sewer System MNR04000 (MS4 General Permit) to the Prior Lake-Spring Lake Watershed District MS4, effective October 15, 2021. The General Permit expires at midnight on November 15, 2025.

  • Click here for the PLSLWD’s 2020 Small Municipal Separate Storm Sewer Systems (MS4) General Permit and SWPPP.

MS4 Reporting:

  • MS4 2021 Report
  • MS4 2020 Report
  • MS4 2019 Report
  • MS4 2015 Report
  • MS4 Annual Report for 2014
  • 2014 MS4 Permit Application & SWPPP Document

Prior Lake – Spring Lake Watershed District

The District covers about 42 square miles in Scott County, MN. Water in the PLSLWD flows mainly from the southwest to the northeast through Spring, Upper Prior and Lower Prior Lakes, and then north through the Prior Lake Outlet Channel to the Minnesota River near Valley Fair amusement park.
Clean Water Land & Legacy Amendment

Prior Lake - Spring Lake Watershed District
4646 Dakota Street SE
Prior Lake, MN 55372

Phone: (952) 447-4166
Email: info@plslwd.org

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