CONEWAGO TWP STP - Advanced Wastewater Treatment in Conewago Township, Pennsylvania

CONEWAGO TWP STP is a municipal wastewater treatment facility located in Conewago Township, York County, Pennsylvania. The plant serves a population of 2,629 residents and operates under the regulatory framework of the United States Clean Water Act, which requires National Pollutant Discharge Elimination System (NPDES) permits for all point source discharges. The plant provides advanced treatment, which goes beyond secondary treatment to remove additional nutrients and contaminants. Its designed capacity is 1,324.89 megaliters, with an actual discharge volume of 946.35 megaliters, indicating operational headroom. As a US facility, it must comply with EPA effluent guidelines and state water quality standards. The treated effluent is discharged into a local water body that ultimately drains into the Susquehanna River basin and then to the Chesapeake Bay. The Chesapeake Bay is a large estuary with significant ecological importance, supporting diverse aquatic life and serving as a critical habitat for migratory birds and fish species.

The plant discharges into a tributary of the Susquehanna River, which flows into the Chesapeake Bay, the largest estuary in the United States. The Chesapeake Bay watershed is ecologically sensitive, supporting diverse aquatic life including blue crabs, oysters, and striped bass. Nutrient pollution from wastewater can contribute to algal blooms and hypoxia, making advanced treatment important for protecting downstream water quality.