Westchester Co Yonkers Joint STP - Major Wastewater Treatment Plant in Yonkers, New York

Westchester Co Yonkers Joint STP is a major wastewater treatment facility located in the City of Yonkers, Westchester County, New York. Serving a population of nearly 480,000, it is one of the larger treatment plants in the region, handling municipal wastewater from a densely populated urban area along the Hudson River. As a large-scale facility in the United States, the plant is subject to the National Pollutant Discharge Elimination System (NPDES) under the Clean Water Act. This regulatory framework requires permits that set effluent limits to protect water quality. Plants of this size typically employ secondary or advanced treatment to meet permit requirements. The plant discharges treated effluent into the Hudson River estuary, a major tidal waterway that flows south to New York Harbor and the Atlantic Ocean. The Hudson River supports diverse aquatic life, including migratory fish species such as striped bass and American shad. The plant's operations are critical to maintaining water quality in this ecologically sensitive urban estuary.

The plant discharges into the Hudson River, which flows through the New York metropolitan area into New York Harbor and the Atlantic Ocean. The lower Hudson is a tidal estuary with significant ecological importance, supporting fish migration, wetlands, and diverse aquatic habitats. The plant's treated effluent must meet stringent water quality standards to protect this sensitive environment.