Williamson T STP and Onsites - Town of Williamson, New York Wastewater Treatment Plant

Williamson T STP and Onsites is a municipal wastewater treatment facility located in the Town of Williamson, Wayne County, New York. Serving a population of about 4,400, the plant is part of the region's infrastructure for managing domestic wastewater in a rural lakeside community. As a U.S. facility, the plant operates under the Clean Water Act, with 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, and the designed capacity of 1.00 million gallons per day suggests it is sized for the local population. The plant's treated effluent discharges into the Lake Ontario basin, a major Great Lake that supports diverse aquatic life and provides drinking water for millions. The facility plays a key role in protecting the lake's water quality from nutrient pollution and pathogens, particularly given the sensitive coastal environment.

The plant discharges into the Lake Ontario watershed, which drains into the St. Lawrence River and eventually the Atlantic Ocean. Lake Ontario is a critical freshwater resource supporting fisheries, recreation, and municipal water supplies. The facility's location within 50 km of the coast underscores the importance of effective treatment to prevent eutrophication and protect nearshore habitats.