Suffolk Co SCSD 12 Birchwood_Holebrook Wastewater Treatment Plant, Holtsville, New York

Suffolk Co SCSD 12 Birchwood_Holebrook is an advanced wastewater treatment facility located in Holtsville, Suffolk County, New York. The plant serves a population of 2,010 and operates as part of the Suffolk County Sewer District 12 system, providing essential wastewater services to the Birchwood and Holebrook communities. The plant employs advanced treatment processes, which go beyond secondary treatment to remove nutrients and other pollutants. With a designed capacity of 681.37 thousand gallons per day and a discharge volume of 529.96 thousand gallons per day, the facility operates efficiently within its capacity. As a US-based plant, it 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. The treated effluent is discharged into local waterways that drain into the Atlantic Ocean via the Great South Bay or Long Island Sound. The plant's proximity to the coast (within 10 km) means its discharge can affect sensitive coastal ecosystems, including salt marshes and estuarine habitats that support diverse marine life. Advanced treatment helps minimize nutrient loading and protects water quality in these ecologically important areas.

The plant discharges into the coastal watershed of Long Island, with treated effluent ultimately reaching the Atlantic Ocean. The receiving waters include the Great South Bay and Long Island Sound, which are ecologically sensitive estuarine environments that support shellfish, finfish, and migratory birds. The advanced treatment process reduces nitrogen and phosphorus loads, helping to mitigate eutrophication and algal blooms in these coastal waters.