Northwestern Lancaster County Authority Wastewater Treatment Plant, Manheim, Pennsylvania

The Northwestern Lancaster County Authority wastewater treatment plant is located in Manheim, Pennsylvania, within the Susquehanna River basin. It serves a small community of 2,422 residents, providing advanced treatment to protect local water quality. As an advanced treatment facility, it goes beyond secondary treatment standards, likely incorporating nutrient removal or other tertiary processes. The plant has a designed capacity of 2,460.51 megaliters and currently discharges 757.08 megaliters annually, indicating operational headroom. Under the US Clean Water Act, such facilities must comply with National Pollutant Discharge Elimination System (NPDES) permits issued by the Pennsylvania Department of Environmental Protection. The treated effluent is discharged to a local waterway that ultimately drains into the Susquehanna River and then to the Chesapeake Bay. The Chesapeake Bay watershed is a large and ecologically significant estuary, and advanced treatment helps reduce nutrient loads that contribute to eutrophication.

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 supports diverse aquatic life, including blue crabs, oysters, and migratory fish. Advanced treatment at this plant helps reduce nitrogen and phosphorus loads, mitigating harmful algal blooms and hypoxia in the bay.