L Mahanoy Twp Dalmatia STP - Advanced Wastewater Treatment in Lower Mahanoy Township, Pennsylvania

L Mahanoy Twp Dalmatia STP is a municipal wastewater treatment facility located on Ridge Road in Lower Mahanoy Township, Northumberland County, Pennsylvania. The plant serves a small community of 720 residents and operates under the regulatory framework of the US Clean Water Act, which requires National Pollutant Discharge Elimination System (NPDES) permits for all discharges. The plant provides advanced treatment, which goes beyond the secondary treatment standard typically required for municipal plants. With a designed capacity of 321.76 thousand gallons per day and a current discharge volume of 264.98 thousand gallons per day, the facility operates below its capacity, indicating room for future growth. Advanced treatment processes often include nutrient removal to protect sensitive water bodies. The treated effluent is discharged into a local stream that flows into the Susquehanna River, a major tributary of the Chesapeake Bay. The Chesapeake Bay watershed is ecologically significant, supporting diverse aquatic life and fisheries. The plant's advanced treatment helps reduce nutrient loads that can cause algal blooms and hypoxia in the bay.

The plant discharges into a local tributary of the Susquehanna River, which flows south through Pennsylvania and Maryland into the Chesapeake Bay. The Chesapeake Bay is the largest estuary in the United States and supports a complex ecosystem of fish, crabs, and waterfowl. Nutrient pollution from wastewater and agriculture has historically caused eutrophication, making advanced treatment important for protecting downstream water quality.