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Environmental Services

Illicit Discharge Detection and Elimination (IDDE) Program

In order to prevent the discharge of illicit substances into the storm drain system, Prince William County instituted an IDDE Program. Through a permit from the Virginia Department of Environmental Quality and the Environmental Protection Agency, the County has the legal responsibility to control discharges and impose fines on anyone who knowingly allows or causes pollutants to enter the storm drain system.  The program requires us to:
·         Inventory and monitor storm water outfalls
·         Eliminate illicit discharges and prevent the improper disposal of waste
·         Educate the public and raise awareness
During periods of dry weather (>72hr without rainfall) outfalls are inspected around the county for flow. Since storm water is the only substance that should be flowing through the storm drain system, flow during dry weather is considered unlikely.  This can indicate the dumping of illicit substances in the storm drain system, illicit connections from sanitary or drinking water systems into the storm drain system, and/or damage to either of these systems causing leakage into the storm drain system.  

Industrial and High Risk Runoff Facilities Program

In addition to dry weather screening the County is also responsible for preventing the discharge of wastes from
industrial facilities into the MS4. These facilities include automotive related facilities, landfills and municipal facilities, raw earth material and cement facilities, and others, that have a high potential to release pollutants into the storm system due to the nature of their operations. Facilities are inspected for contaminated non-stormwater flows into the County’s MS4 and fall into two categories, those which are permitted by DEQ through the the Virginia Pollutant Discharge Elimination System (VPDES) for stormwater discharge, and those which are not. Permitted facilities are regulated and compliance is achieved through DEQ when needed. Facilities which do not have a VPDES permit are directed to DEQ to acquire applicable permits if applicable to ensure the proper control of pollutants entering the County’s stormwater system.


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