Suffolk Co SCSD21 SUNY STP - Stony Brook, New York Wastewater Treatment Plant

Suffolk Co SCSD21 SUNY STP is a municipal wastewater treatment facility located on North Entrance Road in Stony Brook, New York, within Suffolk County. The plant serves a population of approximately 44,937 people, placing it in the medium agglomeration category. It is situated near the State University of New York (SUNY) Stony Brook campus. 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. For a plant of this scale, secondary treatment is typically required, with possible additional nutrient removal to protect sensitive coastal waters. The plant's proximity to the coast (within 50 km) means its discharge ultimately reaches the Atlantic Ocean via local waterways. The receiving water body is likely a tributary of Long Island Sound, an ecologically significant estuary that supports diverse marine life, including shellfish and migratory fish. The plant's operations are critical to protecting water quality in this sensitive coastal environment.

The plant discharges into a local waterway that drains into Long Island Sound, a major estuary on the Atlantic coast. Long Island Sound supports diverse aquatic life, including finfish, shellfish, and migratory birds, and is an important recreational and economic resource. The plant's location within 50 km of the coast underscores the need for effective treatment to prevent nutrient pollution and protect downstream ecosystems.