Illicit discharges are generally any discharges into a storm drain system that are not composed entirely of stormwater, and are restricted by Federal, State, and local laws. Illicit discharges are a problem because, unlike wastewater that flows to a wastewater treatment plant, stormwater generally flows to waterways without any additional treatment. Illicit discharges often include pathogens, nutrients, surfactants, and various toxic pollutants. Visible sewage waste, foul odor, suds or other evidence of contamination, are indicators that an illicit discharge is contaminating the storm sewer.
What are examples of illicit discharge?
Soil or material discharge into storm drains from remodeling, construction, or industrial/commercial areas
Illegal dumping, spills, and other polluted sources
Vehicle washing wastewater
Any car liquids from vehicle maintenance or service stations
Autobody/repair facility, or car wash wastewater
Carpet cleaning wastewater
Open sewage/sanitary sewer disrupted connection waste
Fertilizer, grass clippings, or yard waste
Laundry or household product waste
What are not examples of illicit discharge?
Discharges from firefighting activities
De-chlorinated water flushing or draining
Water from crawl space pumps
Uncontaminated water from the foundation, sump pumps, or footing drains
Routine external building or street washing without detergents or solvents