DUBACH SOUTH STP - Advanced Wastewater Treatment in Dubach, Louisiana

DUBACH SOUTH STP is a municipal wastewater treatment facility located in Dubach, Lincoln Parish, Louisiana, United States. The plant serves a population of approximately 961 residents, providing advanced treatment to protect local water quality. As a small-scale facility, it plays a vital role in managing wastewater for this rural community. The plant employs advanced treatment processes, which go beyond secondary treatment to remove nutrients and other pollutants. With a designed capacity of 529.96 thousand gallons per day and an average discharge volume of 302.83 thousand gallons per day, the facility operates well within its capacity. Under the U.S. Clean Water Act, such plants are regulated through National Pollutant Discharge Elimination System (NPDES) permits issued by the Louisiana Department of Environmental Quality, ensuring compliance with effluent limits. The treated effluent is discharged into local waterways that drain into the Ouachita River basin, ultimately reaching the Mississippi River and the Gulf of Mexico. The plant's advanced treatment helps reduce nutrient loading, which is critical for mitigating hypoxia in the Gulf. By maintaining high treatment standards, DUBACH SOUTH STP supports the ecological health of downstream aquatic habitats.

The plant discharges into tributaries of the Ouachita River, which flows into the Mississippi River and then the Gulf of Mexico. This watershed supports diverse aquatic life and is part of a larger basin that experiences seasonal hypoxia due to nutrient pollution. The advanced treatment at DUBACH SOUTH STP helps reduce nitrogen and phosphorus loads, contributing to the overall health of the Gulf ecosystem.