Jefferson STP Wastewater Treatment Plant, Chesterfield County, South Carolina

Jefferson STP is a municipal wastewater treatment facility located in Chesterfield County, South Carolina, United States. It serves a small population of approximately 1,025 residents, reflecting its role in a rural or small community setting. The plant is situated inland, away from coastal zones, and operates under the regulatory framework of the US Clean Water Act. The facility provides advanced treatment, which goes beyond the secondary treatment standard typically required by the US Environmental Protection Agency (EPA) for municipal plants. Advanced treatment processes often include nutrient removal or additional filtration to further reduce pollutants before discharge. The plant treats an annual wastewater volume of 405.04 million gallons, indicating consistent operation to meet community needs. The treated effluent is discharged into a local waterway that ultimately drains into the Pee Dee River basin, which flows through South Carolina to the Atlantic Ocean. The advanced treatment level helps protect downstream aquatic ecosystems, including the Pee Dee River and its tributaries, which support diverse fish and wildlife populations. By maintaining high treatment standards, the plant contributes to the overall health of the watershed.

The plant discharges into a tributary of the Pee Dee River, which flows southeast through South Carolina to Winyah Bay and the Atlantic Ocean. The Pee Dee River basin supports diverse aquatic life, including migratory fish species, and provides habitat for freshwater mussels and other sensitive organisms. Advanced treatment at this plant helps minimize nutrient loading and protects downstream water quality in this ecologically important river system.