The Charles River Pollution Control District is a regional wastewater treatment plant located in Medway, Massachusetts. The facility provides tertiary treatment of wastewater and septage from domestic, commercial, and industrial sources from the Towns of Medway, Franklin, Bellingham, and Millis. Septage is also accepted from the Towns of Norfolk, Sherborn, Dover, Wrentham, Weston, Holliston, and Sharon. The treated effluent discharges into the Upper Charles River and is regulated by a National Pollutant Discharge Elimination System (NPDES) permit which is jointly enforced by the US Environmental Protection Agency (US EPA) and the Massachusetts Department of Environmental Protection (MassDEP). The facility is designed to treat 5.7 million gallons per day (mgd).