Illicit Discharge

Illicit Discharge is any flow to a municipal separate storm sewer system (or MS4) that is not composed entirely of stormwater, barring a couple of exceptions deemed safe by the Environmental Protection Agency (EPA). Collections from a study in California have indicated that significant volumes of illicit materials can often be found in MS4s. Pollutants often include oil, metals, viruses and bacteria that are harmful to wildlife and human health. Illicit discharge is strictly prohibited and community members have a responsibility to report such violations.