Thompson T Sackett Lake SD STP - Sullivan County, New York Wastewater Treatment Plant

Thompson T Sackett Lake SD STP is a municipal wastewater treatment plant located on State Highway 42 in the Town of Thompson, Sullivan County, New York. It serves a population of approximately 6,257 residents in the surrounding community. The facility is part of the region's wastewater infrastructure, managing sewage from residential areas in the Catskill region. As a plant serving a small agglomeration, it operates under the U.S. Clean Water Act, which requires secondary treatment as a baseline for municipal wastewater facilities. The National Pollutant Discharge Elimination System (NPDES) permit program, administered by the New York State Department of Environmental Conservation, governs its discharge limits and monitoring requirements. Treatment processes typically include primary sedimentation followed by biological treatment to meet state water quality standards. The plant's treated effluent is discharged into nearby streams that flow into the Delaware River Basin, a major watershed supplying drinking water to millions in New York City and downstream communities. The receiving waters support diverse aquatic life and are part of a sensitive ecosystem that includes coldwater fisheries and recreational areas. Proper treatment helps protect water quality in this ecologically important region.

The plant discharges into local tributaries of the Delaware River, which flows southward to Delaware Bay and the Atlantic Ocean. The Delaware River Basin is a critical water source for the northeastern United States, supporting diverse aquatic habitats including trout streams and migratory fish runs. The watershed is ecologically sensitive, with forested headwaters and wetlands that require careful management of nutrient and pollutant loads to maintain water quality and ecosystem health.