Alexandria STP Wastewater Treatment Plant, Alexandria, Virginia

The Alexandria STP is a key wastewater treatment facility serving the city of Alexandria, Virginia, with a population equivalent of roughly 258,000. Located near the Potomac River, the plant plays a critical role in managing municipal wastewater for this urban area within the Washington, D. C. metropolitan region. As a large agglomeration serving over 250,000 people, the plant is expected to meet advanced treatment standards under the U. S. Clean Water Act. Facilities of this scale typically employ secondary or tertiary treatment processes to comply with National Pollutant Discharge Elimination System (NPDES) permits issued by the Virginia Department of Environmental Quality. The designed capacity of 1.00 million gallons per day suggests a substantial infrastructure footprint. The plant's treated effluent ultimately discharges into the Potomac River, which flows into the Chesapeake Bay, the largest estuary in the United States. This downstream environment supports diverse aquatic life, including migratory fish and shellfish, and is ecologically sensitive to nutrient loading. The plant's performance is therefore important for regional water quality and bay restoration efforts.

The Alexandria STP discharges into the Potomac River, which flows into the Chesapeake Bay, a major estuary on the U. S. East Coast. The bay supports a complex ecosystem with species such as blue crabs, oysters, and striped bass, and is sensitive to nutrient pollution that can cause algal blooms and hypoxia. The plant's treatment level directly influences downstream water quality in this ecologically significant watershed.