Parkway STP Wastewater Treatment Plant, Laurel, Maryland

Parkway STP is a municipal wastewater treatment plant located in Laurel, Prince George's County, Maryland, United States. The facility serves a population of about 27,202, placing it in the medium-agglomeration category under U.S. regulatory frameworks. Its designed capacity is 1.00 million gallons per day, indicating a plant sized for a community of this scale. As a U.S. facility, Parkway STP 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. These permits set effluent limits to protect water quality. Plants of this size typically employ secondary treatment, which is the minimum required for municipal wastewater in the U.S. The plant's treated effluent discharges into the Patuxent River basin, a major tributary of the Chesapeake Bay. The Patuxent River supports diverse aquatic life and is an important ecological corridor. The Chesapeake Bay, the largest estuary in the United States, is highly sensitive to nutrient pollution, making effective wastewater treatment critical for downstream water quality and ecosystem health.

Parkway STP discharges into the Patuxent River, which flows into the Chesapeake Bay. The Patuxent River watershed supports a variety of fish, birds, and plant species, and the bay is a vital habitat for blue crabs, oysters, and migratory waterfowl. Nutrient loading from wastewater can contribute to algal blooms and hypoxia in the bay, so the plant's treatment performance is important for maintaining the ecological balance of this sensitive estuary.