Western Branch WWTP - Prince George's County, Maryland Wastewater Treatment Plant

Western Branch WWTP is a major wastewater treatment facility located in Prince George's County, Maryland, United States. It serves a population of approximately 164,252 people, making it a large agglomeration under US regulatory standards. The plant is situated near the Patuxent River watershed, which ultimately drains into the Chesapeake Bay. As a US facility of this scale, Western Branch WWTP operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the Maryland Department of the Environment. Plants serving populations over 100,000 typically employ advanced secondary or tertiary treatment to meet stringent nutrient removal requirements, particularly in the Chesapeake Bay watershed where nitrogen and phosphorus limits are strict. The plant's discharge enters the Western Branch of the Patuxent River, a tributary of the Chesapeake Bay. The Patuxent River is the longest river entirely within Maryland and supports diverse aquatic life, including migratory fish species. The Chesapeake Bay, as the largest estuary in the United States, is ecologically sensitive to nutrient pollution, making the plant's treatment performance critical for downstream water quality.

Western Branch WWTP discharges into the Western Branch of the Patuxent River, which flows into the Patuxent River and ultimately reaches the Chesapeake Bay. The Chesapeake Bay is a vast estuary that supports critical habitats for blue crabs, oysters, and migratory birds. Nutrient loading from wastewater treatment plants in this watershed is a key concern, as excess nitrogen and phosphorus contribute to algal blooms and hypoxia. The plant's location in the Chesapeake Bay watershed places it under the Chesapeake Bay Total Maximum Daily Load (TMDL) framework, which mandates significant nutrient reductions.