National Pollutant Discharge Elimination System

The National Pollutant Discharge Elimination System (NPDES) Phase II permit program for Municipal Separate Storm Sewer Systems (MS4s) went into effect on March 10, 2003. The permit regulates stormwater discharges from cities. The permit requirements were established by the United States Environmental Protection Agency and are administered in Minnesota by the Minnesota Pollution Control Agency (MPCA).

City Storm Water Management

The City of Wayzata submitted its MS4 SWPPP Application for Reauthorization in 2021. The document outlines the City's approach to meeting the NPDES Phase II permit requirements. The permit requires each municipality to address stormwater management in 6 areas:

  • Public Education and Outreach
  • Public Information and Involvement
  • Illicit Discharge Detection and Elimination
  • Construction Site Stormwater Runoff Control
  • Post-Construction Stormwater Management
  • Pollution Prevention and Good Housekeeping

The education requirements are not only called out as a specific area, but are also required to be integrated into each of the other 5 areas.


The permit is valid for 5 years (until 11/15/25). The best management practices (BMPs) that are proposed by the city to address the 6 areas above will be implemented during this time. Not all BMPs will be in effect right away. Since each city is different, the permit allows for implementation within a time frame that makes sense for each city.

Stormwater Pollution Prevention Program Documents