Backyard Conservation

Chanhassen residents value the natural environment, especially their water bodies. The way each person manages their land effects the natural environment for everyone. The following information is designed to help you and your neighbors maintain, restore, and manage Chanhassen’s surface water resources.

Managing Water Run Off

Stormwater runoff is the number one source of water pollution. This is according to the 1996 National Water Quality Inventory Report to Congress. Urbanization leads to increased runoff volumes and rates as there is no way for precipitation to infiltrate through these impervious surfaces. As a result, we are seeing accelerated stream flows, stream bank and shoreline erosion and a decline in aquatic habitat. This also leads to increased stormwater runoff pollutant loads and concentrations.

The pollutants most commonly associated with stormwater runoff that enter our surface and groundwater include pesticides, herbicides, fertilizers, oils, heavy metals, salt, sediment and pathogens. These accumulate on driveways, parking lots, sidewalks and other hard surfaces and are transported with the stormwater runoff.

To combat these stormwater runoff issues the City of Chanhassen has adopted the Stormwater Program for Municipal Separate Storm Sewer System (MS4). The intent of this system to reduce the pollutant load to water resources from storm sewer systems to the “maximum extent practicable.” Stormwater discharges are regulated through National Pollution Discharge Elimination System (NPDES) permits. Through this permit, Chanhassen, as an owner/operator of a storm sewer system, must develop a Stormwater Pollution Prevention Program (SWPPP) that uses a variety of best management practices (BMPs) to achieve this goal.