East Prospect STP - Lower Windsor Township, Pennsylvania Wastewater Treatment

East Prospect STP is a municipal wastewater treatment facility located in Lower Windsor Township, York County, Pennsylvania. The plant serves a population of approximately 2,999 people, placing it in the small community category under U.S. regulatory frameworks. As a U.S. facility, the plant operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the Pennsylvania Department of Environmental Protection. For small agglomerations, secondary treatment is typically required to meet effluent standards for biochemical oxygen demand and total suspended solids. The plant discharges treated wastewater into a local waterway within the Susquehanna River basin, which ultimately flows into the Chesapeake Bay. The Chesapeake Bay watershed is ecologically significant, supporting diverse aquatic life and requiring nutrient management to prevent eutrophication.

The plant's treated effluent enters a tributary of the Susquehanna River, which drains into the Chesapeake Bay. The Chesapeake Bay is the largest estuary in the United States and supports critical habitats for fish, crabs, and migratory birds. Nutrient loading from wastewater treatment plants in the basin is a key concern for bay health.