Lower Grand Watershed Interactive Tool (WIT) - Stormwater Management

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One of the most significant, yet unrecognized groups of water contaminants is storm water pollutants. When it rains, storm water runs over yards, streets, roads, highways, parking lots, parks, and playgrounds, carrying with it everything in its path, including debris and pollutants. Eventually, the water will travel to a stream, either over land or via a storm drain. Storm drains are frequently located alongside streets and parking lots. Unlike sanitary sewers that divert water to a treatment plant directly from your home, storm drains lead directly to surrounding lakes and rivers without any type of treatment. All the debris and pollutants that were picked up by storm water runoff, end up in your lakes and streams!
Lower Grand River Watershed Storm Water Savvy Display Board (High Resolution PDF, 3.8mb)
Lower Grand River Watershed Storm Water Savvy Display Board (Low Resolution PDF, 1.4 mb)
National Pollutant Discharge Elimination System (NPDES) Phase II Program

The Clean Water Act of 1972 set up the NPDES. The NPDES program required communities around the country with urbanized areas to begin tackling the issue of storm water pollution. In recent years, several communities in Kent and Ottawa Counties were required to develop an illicit discharge elimination program (IDEP). The IDEP was required to include an investigation of the waters of the state to identify, and eventually eliminate, illicit discharges and connections to the storm sewer.

What is an Illicit Discharge or Connection?
An illicit discharge is any discharge to the storm sewer system that is not composed entirely of rain water or groundwater. Examples include dumping of motor vehicle fluids, household hazardous wastes, grass clippings, leaf litter, industrial waste, restaurant wastes, or other non-storm water materials into a storm sewer system via a pipe or other direct connection. Sources of illicit connections may include sanitary sewer taps, wash water for laundromats or car washes, and other similar sources.

Click the image for an animated demonstration of an incorrect connection.

How Do I Spot an Illicit Discharge or Connection?

  • Look for makeshift pipes or hoses that lead to storm drain or body of water.
  • Watch for stains, unusual odors, structural damage to streets or gutters, and abnormal vegetative growth in nearby lakes and streams.
  • If you see an illicit discharge or connection, REPORT IT to your community. The Illicit Discharge and Connection Ordinance, adopted by your community, gives them legal authority to inspect and sample discharge, as well as enforce sanctions for violations.

Click the image for an animated demonstration of a correct connection.

Click on this link to download a copy of the 2007 Lower Grand River Watershed Managment Plan prepared for the Grand Valley Metro Council by Fishbeck, Thompson, Carr, and Huber, Inc. for the NPDES Phase II Storm Water Program.

*Text and graphics for this page were obtained from the MDOT Storm Water Management Brochure: Together...Better Roads, Cleaner Streams.


Grand Valley Metro Council
40 Pearl St. NW, Ste. 410 Grand Rapids, MI 49503 (616) 776-3876 [email protected]

Page last modified November 18, 2011