Corcoran MS4 Area Information

Rain and snow melt run over impervious surfaces — roads, sidewalks, driveways, parking lots, roof tops, etc — and pick up pesticides, fertilizers, oils, metals, bacteria, salt, sediment, trash, and other pollutants and carry them into storm drains. Storm drains discharge these pollutants into lakes rivers, streams, and wetlands; stormwater runoff is a leading source of water pollution. 

In addition, stormwater runoff from impervious surfaces travels faster and in larger quantities, which results in damage to rivers, streams, and wetlands; destruction of aquatic habitats; and elevated pollutant levels reaching surface waters. Impervious surfaces also prevent stormwater from soaking into the ground and recharging groundwater.
Cities like Corcoran, that own or operate a municipal separate storm sewer systems (MS4), play a key role in preventing stormwater runoff from harming Minnesota’s valuable water resources. The Minnesota Pollution Control Agency (MPCA) permits cities through the National Pollutant Discharge Elimination System (NPDES) Municipal Stormwater Program.
The City of Corcoran has developed a Stormwater Pollution Prevention Plan (SWPPP) to comply with its permit and reduce the amount of sediment and other pollutants that discharge to our water bodies.

If you have questions or would like to provide any input on the City of Corcoran’s Stormwater program, please contact us at [email protected].

2020 MS4 Annual Report

MS4 Permit and Stormwater Prevention Plan
City of Corcoran National Pollutant Discharge Elimination System (NPDES) MS4 Phase 2 Permit and Stormwater Pollution Prevention Plan

2021 MS4 Permit City of Corcoran - Part 1

2021 MS4 SWPPP Permit City of Corcoran - Part 2
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