Understanding the MS4 Stormwater System

An MS4—short for municipal separate storm sewer system—carries stormwater from its inlet all the way to the outfall. It can take in roads with drainage systems, municipal streets, catch basins, curbs and gutters, ditches, man-made channels, and storm drains.

The City of Forest Lake holds an MS4 designation. Under this mandate, the City was required to secure an NPDES permit and prepare a SWPPP by February 2007. 

Revisions to the Surface Water Management Plan are currently being reviewed.