ST LOUIS SEWERAGE PROJECT - Advanced Wastewater Treatment in Leesburg, Virginia

The ST LOUIS SEWERAGE PROJECT is a wastewater treatment facility located in Leesburg, Loudoun County, Virginia. Serving a small population of 377, the plant provides advanced treatment to protect local water quality. It operates as part of the municipal infrastructure for the Leesburg area. The plant employs advanced treatment processes, which go beyond secondary treatment to remove nutrients and other pollutants. With a designed capacity of 340.69 units and a current discharge volume of 151.42 units, the facility operates well within its capacity. As a US plant, it is subject to the Clean Water Act and likely operates under an NPDES permit issued by the Virginia Department of Environmental Quality, ensuring compliance with effluent limits. The treated effluent from the plant is discharged into local waterways that ultimately drain into the Potomac River and Chesapeake Bay. The Chesapeake Bay watershed is ecologically significant, supporting diverse aquatic life and important fisheries. Advanced treatment helps reduce nutrient loading, which is critical for mitigating hypoxia in the Bay.

The plant discharges into the Potomac River basin, which flows into the Chesapeake Bay, the largest estuary in the United States. The Chesapeake Bay supports a complex ecosystem including blue crabs, oysters, and migratory fish. Nutrient pollution from wastewater is a key concern, and advanced treatment helps reduce nitrogen and phosphorus loads that contribute to algal blooms and dead zones.