171 plants indexed.
Maryland's wastewater treatment is regulated by the Maryland Department of the Environment. Major plants include Blue Plains (serving the DC metro) and Back River (Baltimore). UtilityRadar indexes 171 wastewater treatment plants in Maryland with a combined designed capacity of 58,285 m³/day. The largest plant on file is Winebrenner WWTP, treating 3,785 m³/day.
Maryland's wastewater treatment is regulated by the Maryland Department of the Environment. Major plants include Blue Plains (serving the DC metro) and Back River (Baltimore).
UtilityRadar's directory currently lists 171 wastewater treatment plants across Maryland. Together these plants represent a combined designed capacity of approximately 58,285 m³/day.
By treatment level, the directory contains 56 secondary, 38 advanced, 1 primary-treatment plants. Secondary treatment (typically activated sludge with biological nutrient removal) is the most common standard.
The largest plant indexed for Maryland is Winebrenner WWTP, with a designed capacity of 3,785 m³/day.
Plant records are aggregated from publicly available regulatory data (US EPA ECHO, EU UWWTD reporting, national water authority publications), augmented by direct operator information and verified via Google Maps coordinates. Each record includes location, treatment level, capacity where known, operator and operational status. To browse plants by treatment level worldwide, see our secondary and advanced filter views, or read our guide to how sewage treatment works.
Prince Frederick WWTP I is an advanced treatment plant serving 1,665 people in Buena Vista Hills, Maryland. It discharges 700.30 units of treated wastewater daily, with a designed capacity of 1703.43 units.
Woodsboro STP is an advanced wastewater treatment plant in Woodsboro, Maryland, serving a population of 1,000. It discharges 302.83 cubic meters per day and has a designed capacity of 946.35 cubic meters per day.
TRAPPE WWTP in Locust Grove, Maryland, serves 1,201 people with advanced treatment. It discharges 382.33 million gallons annually and has a designed capacity of 757.08 million gallons.
Millington_Sandfield WWTP is a secondary treatment plant serving 470 people in Sudlersville, Maryland. It discharges 208.20 units of treated wastewater daily, with a designed capacity of 397.47 units.
Betterton WWTP is a secondary treatment plant in Betterton, Maryland, serving 510 people. It discharges 94.64 m³/day of treated wastewater within 10 km of the Chesapeake Bay coast.
ACCIDENT WWTP is an advanced treatment facility serving 365 people in Accident, Maryland. It discharges 439.11 units of treated wastewater daily, with a designed capacity of 567.81 units.
Myersville WWTP is an advanced treatment plant serving 2,600 people in Summers, Maryland. It discharges 798.72 units of treated wastewater daily, with a designed capacity of 1,135.62 units.
Vienna WWTP is a secondary treatment facility serving 548 people in Vienna, Maryland. It discharges 147.63 million gallons per year and has a designed capacity of 518.60 million gallons.
Twin Cities WWTP in Dorchester County, Maryland, serves a small population of 998 with secondary treatment. The plant discharges 423.97 units of treated wastewater and has a designed capacity of 1063.70 units.
Fort Frederick State Park wastewater treatment plant in Four Locks, Maryland serves approximately 100 people with secondary treatment. It discharges 37.85 m³/day into the local watershed.
Assateague State Park TP is an advanced wastewater treatment plant in Franklin Heights, Maryland, serving 425 people. It discharges 37.85 m³/day and is located within 10 km of the Atlantic coast.
Cheltenham WWTP is a secondary treatment facility serving 220 people in Cheltenham, Maryland. It discharges treated wastewater into the local watershed, contributing to the Chesapeake Bay basin.
Poplar Hill wastewater treatment plant in Royal Oak, Maryland serves 250 people with primary treatment. It discharges 90.85 million gallons per year near the Chesapeake Bay.
Victor Cullen WWTP is a secondary treatment plant in Sabillasville, Maryland, serving 135 people. It discharges 68.14 thousand cubic meters per year into local waterways.
PORT DEPOSIT WWTP is an advanced treatment plant serving Port Deposit, Maryland, USA. It discharges 454.25 million gallons per year and has a designed capacity of 567.81 million gallons per year.
Greenridge Forestry Camp in Allegany County, Maryland, treats wastewater with advanced processes for a small population of 304. The plant discharges 37.85 million gallons per year, operating under U.S. Clean Water Act regulations.
Rocky Gap State Park wastewater treatment plant serves 2,542 people in Allegany County, Maryland, with advanced treatment and a capacity of 454.25 units. It discharges treated effluent into the local watershed, supporting the Chesapeake Bay ecosystem
Bowie State College STP in Upper Marlboro, Maryland, serves 3,857 people with advanced treatment. The plant discharges 681.37 thousand cubic meters annually, operating under US EPA NPDES regulations.
Deep Creek Lake State Park wastewater treatment plant in Garrett County, Maryland, serves a small population with advanced treatment. It discharges treated water into the local watershed, supporting the region's environmental health.
New Germany State Park wastewater treatment plant in Maryland serves 600 people with secondary treatment. It discharges 37.85 m³/day and has a designed capacity of 113.56 m³/day.
UtilityRadar indexes 171 wastewater treatment plants in Maryland, with treatment level, capacity, operator and discharge data on each record.
Among the indexed plants, Prince Frederick WWTP I has the highest designed capacity at 1,703 m3/day.