City of Indianapolis MS4 stormwater program

The City of Indianapolis operates a Municipal Separate Storm Sewer System (MS4) stormwater program administered by the Department of Public Works under an Indiana Department of Environmental Management (IDEM) permit. The program requires public education, illicit discharge detection and elimination, construction site runoff controls, and post-construction stormwater management within Indianapolis/Marion County. Residents can report stormwater complaints and illicit discharges through the city's 311 reporting system and DPW online resources.