Westchester Co Mamaroneck SD STP - Village of Mamaroneck Wastewater Treatment Plant

Westchester Co Mamaroneck SD STP is a municipal wastewater treatment plant located in the Village of Mamaroneck, Westchester County, New York. It serves a population of approximately 93,865 residents in the surrounding area, making it a medium-to-large agglomeration under US regulatory standards. As a US facility, the plant operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the New York State Department of Environmental Conservation. These permits set effluent limits to protect water quality. The plant's designed capacity is 1.00 million gallons per day, reflecting its role in managing local wastewater flows. The plant discharges treated effluent into the Long Island Sound via the Mamaroneck River or nearby tributaries. The Long Island Sound is an ecologically important estuary that supports diverse marine life, including fish, shellfish, and migratory birds. The plant's operations help protect this sensitive coastal ecosystem from nutrient pollution and other contaminants.

The plant discharges into the Mamaroneck River, which flows into the Long Island Sound, a major estuary along the northeastern US coast. The Sound supports diverse aquatic life, including commercially important fish and shellfish species, and serves as a critical migratory corridor for birds. Protecting water quality in this watershed is essential for maintaining the ecological health of the Sound and its recreational and economic value.