Overview

A Municipal Separate Storm Sewer System (MS4) is a conveyance, or system of conveyances (i.e., municipal streets, catch basins, curbs, gutters, ditches, channels, etc.) that is designed to collect stormwater and is owned and operated by a public entity. Stormwater from an MS4 is regulated under the National Pollutant Discharge Elimination System (NPDES) MS4 permit to reduce pollution from conveyance systems. Chanhassen is a MS4 and is required to minimize pollutants that enter their systems through a Stormwater Pollution Prevention Plan (SWPPP). Each SWPPP includes six minimum control measures (MCM) that address the following areas:

1. Public education and outreach
2. Public participation and involvement
3. Illicit discharge detection and elimination
4. Construction site stormwater runoff control
5. Post-construction site management
6. Good housekeeping and pollution prevention

In order to comply with a section of MCM 2, the poster board providing information on the work and implementation of the city’s MS4 program in 2023 will be available for viewing on the city webpage. For each MCM, descriptions will be given on what the city did during the year to comply with the permit.