DPW - Environmental Division - StormWater & Water Quality Management

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An illegal discharge, also known as an illicit discharge, is a discharge to the municipal separate storm sewer system (MS4) that is not composed entirely of stormwater. Exceptions to this rule include waters used for fire-fighting purposes, air conditioning condensate and water used for irrigation purposes. A complete list of allowable non-stormwater discharges can be found in table 10-2 of the Stormwater Management Plan which is located below.

Illicit discharges can result from numerous different sources to include illicit connections from a sanitary sewer, improper disposal of hazardous materials, soapy water from car washing, leaking vehicles, and pet waste left on the ground. Simple pollution prevention and good housekeeping techniques can be put in place to mitigate illicit discharges from these sources and activities. Examples include properly covering hazardous materials when they are not in use, cleaning up after pets, washing cars in grassy areas or car washes, and placing drip pans under leaking vehicles. For more information on how an illicit discharge can be avoided, contact the Directorate of Public Works Environmental Compliance Branch at 573-596-0882.

If an illegal discharge is observed or suspected, please report it by notifying the Directorate of Public Works Environmental Compliance Division at 573-596-0882 and completing the first portion of the Illicit Discharge Report Form (located below). If you have difficulty completing the Form, let the Environmental Compliance know and they will assist in the completion. Once the form has been completed please use the "SUBMIT" button on the form to send it to the Environmental Division.


Report an Illegal Storm Water Discharge

Spill Prevention and Response

Hazardous and Special Waste Management

NPDES Industrial Operating Permit MO-0117251

MS4 General Permit MO-R040088 (7/2009)

MS4 Permit Management Plan (05/2014)

Stormwater Pollution Prevention Plan (09/2013)

Land Disturbance Permit Process

Stormwater Information/Brief Sheet


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