NAPOLEONVILLE STP - Advanced Wastewater Treatment in Napoleonville, Louisiana

NAPOLEONVILLE STP is a municipal wastewater treatment facility located in Napoleonville, Assumption Parish, Louisiana. The plant serves a population of approximately 1,900 residents, providing advanced treatment to protect public health and the environment in this rural community within the Mississippi River Delta region. The plant employs advanced treatment processes, exceeding the secondary treatment standards typically required under the U.S. Clean Water Act. With a designed capacity of 1,135.62 thousand cubic meters per year and an average discharge volume of 870.65 thousand cubic meters per year, the facility operates at about 77% capacity, indicating adequate headroom for current demand. As a publicly owned treatment works (POTW), it operates under a National Pollutant Discharge Elimination System (NPDES) permit issued by the Louisiana Department of Environmental Quality. The treated effluent from NAPOLEONVILLE STP is discharged into local streams that flow into Bayou Lafourche, a distributary of the Mississippi River. This waterway ultimately drains into the Gulf of Mexico, supporting diverse aquatic life and contributing to the nutrient dynamics of the Mississippi River plume. The advanced treatment helps reduce nutrient loading, which is critical for mitigating hypoxia in the Gulf.

The plant discharges into Bayou Lafourche, a historic Mississippi River distributary that flows through southeastern Louisiana into the Gulf of Mexico. This watershed supports a rich ecosystem of wetlands, swamps, and estuarine habitats that are vital for fish, shellfish, and migratory birds. The advanced treatment at this facility helps reduce nutrient and pollutant loads, contributing to the health of the Gulf's coastal waters and addressing concerns about seasonal hypoxia.