Ferriday Southwest WWTP - Concordia Parish, Louisiana Wastewater Treatment

Ferriday Southwest WWTP is a municipal wastewater treatment facility located in Concordia Parish, Louisiana, serving a population of about 4,111. The plant is situated inland, more than 50 km from the coast, and discharges into local waterways that ultimately drain into the Mississippi River system. As a small-scale facility in the United States, the plant is subject to the National Pollutant Discharge Elimination System (NPDES) permit program under the Clean Water Act. Plants of this size typically employ secondary treatment or equivalent to meet effluent limits. The population served suggests a moderate capacity. The plant's receiving water body is part of the Lower Mississippi River basin, which supports diverse aquatic life and provides critical habitat for fish and migratory birds. The treated effluent contributes to the overall water quality of the region, with downstream impacts on the Mississippi River and eventually the Gulf of Mexico.

The plant discharges into local tributaries of the Lower Mississippi River, which flows into the Gulf of Mexico. This watershed supports a rich ecosystem including bottomland hardwood forests and wetlands that provide habitat for numerous species. The Mississippi River delta is an ecologically sensitive area, and nutrient loading from wastewater can contribute to hypoxic zones in the Gulf.