Illicit Discharge Elimination Program
The Phase II Stormwater Regulations include measures that must be met by municipal separate storm sewer system (MS4) owners. One of the required components of the regulations is the Illicit Discharge Elimination Program (IDEP). To address this requirement, MS4's need to develop an IDEP Plan that is designed to prohibit and effectively eliminate illicit discharges and connections, including discharges of sanitary wastewater to the permittee's separate storm sewer system.
An approved MS4 IDEP Plan contains the following necessary requirements:
- A program to find, prioritize and eliminate illicit discharges and illicit connections identified during dry weather screening activities.
- A description of a program to minimize infiltration of seepage from sanitary sewers and on-site sewage disposal systems into the storm sewer drainage system.
- A method for determining the effectiveness of the illicit discharge elimination activities, which shall result in the inspection of each storm water point source a minimum of every five years unless an alternative schedule is approved.
- An updated map showing the location of each known stormwater point source (outfall) and the respective receiving water or drainage system.
The City of Kalamazoo prepared an IDEP Plan as part of its Stormwater NPDES Permit Application in March 2003 and a revised plan in December 2004. The City is performing dry weather screenings of the outfalls to identify illicit connections, and performing facility inspections.