Charles County’s Municipal Stormwater Permit

Charles County operates its storm water system under National Pollutant Discharge Elimination System (NPDES) Municipal Separate Storm Sewer System (MS4) Permit Number 22-DP-3322.  The Maryland Department of the Environment (MDE) is the state agency responsible or issuing all NPDES permits in Maryland, including MS4 Permits, on behalf of the Environmental Protection Agency. 

MS4 Permits are issued in five (5) year cycles. Charles County’s current permit has an effective period December 30, 2022, through December 29, 2027. The overarching goal of the permit is to restore and maintain the chemical, physical, and biological integrity of the waterways. 

Charles County NPDES MS4 Annual Report(s)