EUNICE STP - Eunice, Louisiana Wastewater Treatment Plant

EUNICE STP is a municipal wastewater treatment plant located at 807 College Road in Eunice, St. Landry Parish, Louisiana. The facility serves a population of about 11,500 people, placing it in the small-to-medium agglomeration category for U.S. wastewater infrastructure. As a U.S. facility, the plant operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permitting. For plants serving this population range, secondary treatment is typically required, involving biological processes to reduce organic matter and suspended solids before discharge. The plant's treated effluent is discharged into local waterways that drain into the Mermentau River basin, which flows into the Gulf of Mexico. This region supports diverse aquatic life and is part of the larger Mississippi River Delta ecosystem, making proper treatment essential for downstream water quality.

The plant discharges into the Mermentau River basin, which flows through south-central Louisiana and empties into the Gulf of Mexico. This coastal watershed supports important fisheries and migratory bird habitats. The region's flat terrain and slow-moving waterways make it sensitive to nutrient loading, requiring effective treatment to protect downstream ecosystems.