Leesburg San Sewer System | Wastewater Treatment in Leesburg, Virginia

Leesburg San Sewer System is a municipal wastewater treatment facility located at 1378 East Market Street in Leesburg, Virginia. It serves a population of about 32,712 residents in Loudoun County, placing it in the medium-agglomeration category. Under the US Clean Water Act, plants of this scale are required to meet secondary treatment standards through National Pollutant Discharge Elimination System (NPDES) permits issued by the Virginia Department of Environmental Quality. These permits set effluent limits for biochemical oxygen demand, total suspended solids, and other pollutants to protect water quality. The plant discharges treated wastewater 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. Nutrient removal is a key concern in this region to reduce impacts on the bay's ecosystem.

The plant's treated effluent flows into tributaries of the Potomac River, which empties into the Chesapeake Bay. The Chesapeake Bay is the largest estuary in the United States and supports a rich ecosystem including blue crabs, oysters, and migratory fish. Nutrient pollution from wastewater is a major concern, driving advanced treatment requirements in sensitive areas.