Philadelphia V STP Wastewater Treatment Plant, Village of Philadelphia, New York

Philadelphia V STP is a municipal wastewater treatment facility located in the Village of Philadelphia, Jefferson County, New York. The plant serves a population of approximately 1,602 residents, classifying it as a small-scale treatment facility under U.S. EPA guidelines. The plant provides secondary treatment, which is the standard level required by the Clean Water Act for municipal wastewater facilities in the United States. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The plant has a designed capacity of 757.08 cubic meters per day and discharges an average volume of 541.31 cubic meters per day, indicating operational capacity below design limits. The treated effluent from Philadelphia V STP is discharged into a local waterway that drains into the St. Lawrence River watershed. This river system supports diverse aquatic life and is an important migratory corridor for fish species. The plant's operations are subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the New York State Department of Environmental Conservation, ensuring compliance with water quality standards.

Philadelphia V STP discharges into a tributary of the St. Lawrence River, which flows northeast into the Gulf of St. Lawrence and ultimately the Atlantic Ocean. The St. Lawrence River is a major ecological corridor supporting diverse fish populations, including lake sturgeon and American eel. The plant's secondary treatment helps protect downstream water quality in this sensitive freshwater ecosystem.