Williston STP - Wastewater Treatment Plant in Williston, South Carolina

Williston STP is a municipal wastewater treatment plant located in Williston, South Carolina, serving a population of about 4,400. The facility is situated in Barnwell County, an inland area in the southeastern United States. As a publicly owned treatment works (POTW) in the United States, the plant is subject to the National Pollutant Discharge Elimination System (NPDES) permit program under the Clean Water Act. For a community of this size, secondary treatment is typically required to meet effluent limits for biochemical oxygen demand and total suspended solids. The plant's treated effluent is discharged into a local water body that ultimately drains into the Savannah River Basin, which flows to the Atlantic Ocean. The facility plays a key role in protecting downstream water quality and aquatic habitats in this ecologically diverse region.

Williston STP discharges into a tributary of the Savannah River Basin, which flows through South Carolina and Georgia before reaching the Atlantic Ocean. The basin supports diverse aquatic life, including fish and macroinvertebrates, and provides drinking water for downstream communities. Protecting water quality in this watershed is essential for maintaining ecological balance and recreational uses.