Illicit discharges are any discharges that go into the storm sewer system that are not composed entirely of stormwater, with some exceptions. Some examples of illicit discharges:
Dewatering of sediment-laden water from construction sites
Improper washing of equipment, vehicles, or other maintenance activities
Improper connection of sanitary sewers
Dumping or spilling of paint, household cleaners and chemicals, yard waste, fertilizer, oil and other hazardous materials in or near the storm drain
These discharges are considered ‘illicit’ because public stormwater systems are not designed to accept non-stormwater wastes. Stormwater systems do not treat stormwater in the same way that sanitary sewage or waste water is treated. These wastes are treated at a wastewater treatment plant to achieve a legally specific water quality standard before being discharged to our surface waters.
City Code makes exceptions for activities such as water line flushing and other potable water sources, landscape irrigation, foundation or footing drains, firefighting activities, and any other water source not containing pollutants.
To Report an Illicit Discharge
If there is an immediate threat to human health or safety, call 911 first.
Contact the Minnesota Duty Officer at 651-649-5451 or 1-800-422-0798
Krista Spreiter, Natural Resources Coordinator Email Krista Spreiter Office Phone: 651-255-1123 Fax: 651-452-8940
Mendota Heights Police Department Phone: 651-452-1366
For more information on Illicit Discharges, and how you can prevent stormwater pollution: