Illicit Discharge Detection and Elimination - Minimum Control Measure #3

MCM 3 is Illicit Discharge Detection and Elimination. Illicit discharges are discharges into the storm sewer system (e.g. storm drains, ditches, ponds) that are not entirely composed of stormwater. SMS4s are required to screen outfall pipes for illicit discharges, respond to reports of illegal discharges, and map the storm sewer system to be able to track the sources of illicit discharges. SMS4s must address illegal discharges because stormwater runoff is not treated at a treatment plant before discharging into our waterways.

Examples of illegal discharges include: chemical spills, failing septic systems, overflowing grease traps, leaking trash dumpsters, washing paint or construction waste down the storm drain, and depositing pet waste into storm drains or ditches. Examples of exceptions are firefighting activities or water utility line flushing. For more information, click here.

For a copy of Horry County's Illicit Discharge Detection and Elimination Field Guide, click here.
If you find an illicit discharge and want to report it, contact our Hotline at 843-381-8000 or submit an online form by clicking here.

To report hazardous chemical spills, oil spills, or fish kills, contact SC DHEC Emergency Response at 1-888-481-0125.