Jennings STP | Wastewater Treatment Plant in Jennings, Louisiana

Jennings STP is a municipal wastewater treatment plant located in Jennings, Louisiana, serving a population of around 11,305. The facility is situated inland in Jefferson Davis Parish, part of the state's southwestern region. As a publicly owned treatment works, it plays a key role in managing local wastewater and protecting public health. Under the U.S. Clean Water Act, municipal plants of this scale are typically required to provide secondary treatment, which removes at least 85% of biochemical oxygen demand and suspended solids. The National Pollutant Discharge Elimination System (NPDES) permit program governs discharge limits and monitoring, ensuring compliance with water quality standards. The plant is expected to meet these federal and state requirements. Treated effluent from Jennings STP is discharged into local waterways that ultimately drain into the Gulf of Mexico via the Mermentau River basin. This region supports diverse aquatic life and is part of the larger Mississippi River watershed. Proper treatment is essential to prevent nutrient pollution and protect downstream ecosystems, including coastal marshes and estuaries.

Jennings STP discharges into the Mermentau River basin, which flows southward into the Gulf of Mexico. The receiving waters support a variety of fish and wildlife, including migratory birds and aquatic species. The area's flat coastal plain and proximity to the Gulf make nutrient management critical to avoid algal blooms and hypoxia in downstream marine environments.