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.
Willards WWTP is an advanced treatment facility serving 940 people in Willards, Maryland. It discharges 302.83 units of treated wastewater, operating under U.S. Clean Water Act regulations.
Smithsburg WWTP is a secondary treatment plant serving 1,826 residents in Smithsburg, Maryland. It discharges 779.80 thousand cubic meters of treated wastewater annually, with a designed capacity of 2,271.24 thousand cubic meters.
Hancock STP is an advanced wastewater treatment plant serving 1,700 people in Hancock, Maryland. It discharges treated water into the Potomac River watershed, contributing to Chesapeake Bay water quality.
Funkstown WWTP is a secondary treatment plant in Washington County, Maryland, serving 1,214 people. It discharges 348.26 million gallons per year and operates under U.S. EPA NPDES regulations.
Clear Spring WWTP is an advanced treatment plant serving 570 people in Washington County, Maryland. It discharges 268.76 units of treated wastewater daily, with a designed capacity of 1135.62 units.
Sandy Hook WWTP is a secondary treatment facility in Sandy Hook, Maryland, serving 145 people. It discharges 49.21 million gallons per year and has a designed capacity of 113.56 million gallons.
Antietam WWTP in Sharpsburg, Maryland, serves 1,373 people with secondary treatment. The plant discharges 605.67 million gallons per year into the Potomac River watershed.
Winebrenner WWTP is an advanced treatment facility in Highfield Cascade, Maryland, serving 3,157 people. It discharges 522.39 volume units daily with a designed capacity of 3,785.40 units.
Oxford WWTP is a secondary treatment plant serving 750 people in Oxford, Maryland. It discharges treated wastewater near the Chesapeake Bay, a major estuary on the U.S. East Coast.
Martingham Wastewater Treatment System serves 719 people in Saint Michaels, Maryland, discharging secondary-treated wastewater near the Chesapeake Bay.
Talbot County Region V WWTP is a secondary treatment plant serving 900 people in Tilghman Island, Maryland. It discharges treated wastewater near the Chesapeake Bay, a major estuary on the U.S. East Coast.
Tylerton WWTP is an advanced treatment plant serving 173 people in Tylerton, Maryland, USA. It discharges 22.71 m³/day of treated wastewater near the Chesapeake Bay.
FAIRMOUNT STP is a secondary treatment plant serving 570 people in Landonville, Maryland. It discharges 98.42 million gallons per day and is located within 10 km of the coast.
Ewell Rhodes Point WWTP is a secondary treatment plant serving 600 people in Rhodes Point, Maryland. It discharges 75.71 million gallons annually and is located within 10 km of the coast.
Chopticon High School WWTP in Morganza, Maryland, serves 1,844 people with advanced treatment. The plant discharges 3.79 million gallons per day into local waterways near the Chesapeake Bay.
Wicomico Shores WWTP is an advanced treatment plant in Barbers Quarter, Maryland, serving 1,254 people. It discharges 420.18 units of treated wastewater and operates near the Chesapeake Bay.
Forest Farm WWTF is an advanced treatment plant in Saint Mary's County, Maryland, serving 882 people. It discharges treated wastewater near the Chesapeake Bay, supporting local water quality.
St Clement s Shores WWTP is an advanced treatment plant in Compton, Maryland, serving 706 people. It discharges 321.76 units of treated wastewater near the Chesapeake Bay.
QUEENSTOWN WWTP is a secondary treatment plant serving 617 people in Queenstown, Maryland. It discharges 238.48 units of treated wastewater daily, with a designed capacity of 757.08 units.
Rock Hall WWTP is an advanced treatment facility serving 1,945 people in Rock Hall, Maryland. It discharges treated wastewater into the Chesapeake Bay watershed, operating under U.S. EPA NPDES regulations.
UtilityRadar indexes 171 wastewater treatment plants in Maryland, with treatment level, capacity, operator and discharge data on each record.
Among the indexed plants, Winebrenner WWTP has the highest designed capacity at 3,785 m3/day.