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Illicit Discharge Detection and Elimination Program (IDDEP)
Illicit discharges are improper non-stormwater discharges into NCDOT's stormwater drainage system which have the potential to compromise the quality of NCDOT's stormwater runoff.  Examples of illicit discharges include straight piping of sanitary wastewater or greywater, car wash wastewater, and disposal of used motor oil or left over paint into the stormwater drainage system.  NCDOT field staff are trained to recognize and report these discharges.  NCDOT works in partnership with the NC Department of Environmental Quality to eliminate verified illicit discharges.


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