Alexandria Bay V STP - Wastewater Treatment Plant in Village of Alexandria Bay, New York

Alexandria Bay V STP is a municipal wastewater treatment facility located in the Village of Alexandria Bay, Jefferson County, New York. The plant serves a population of about 7,088 residents and has a designed capacity of 1.00 million gallons per day, indicating it is a small to medium-sized facility typical of rural communities in the region. As a publicly owned treatment works (POTW) in the United States, the plant operates under the Clean Water Act's National Pollutant Discharge Elimination System (NPDES) permit program. Plants of this scale commonly employ secondary treatment, which includes biological processes to reduce organic matter and suspended solids, meeting EPA standards. The plant's treated effluent is discharged into the St. Lawrence River watershed, which flows northeast through the Thousand Islands region and eventually into the Gulf of St. Lawrence and the Atlantic Ocean. This area is ecologically significant, supporting diverse aquatic life and serving as a critical migratory corridor for fish and birds. The plant's operations help protect water quality in this sensitive freshwater ecosystem.

The plant discharges into the St. Lawrence River, which flows from Lake Ontario to the Gulf of St. Lawrence and the Atlantic Ocean. This watershed is part of the Great Lakes Basin, a globally significant freshwater system. The Thousand Islands region supports diverse aquatic habitats, including wetlands and spawning grounds for fish species such as walleye and northern pike. Protecting water quality here is essential for maintaining ecological balance and recreational uses.