Columbia Sewerage System - Secondary Wastewater Treatment in Columbia, Louisiana

The Columbia Sewerage System is a municipal wastewater treatment facility located in Columbia, Caldwell Parish, Louisiana. Serving a small population of 480 residents, the plant provides secondary treatment to meet state and federal water quality standards under the US Clean Water Act. The plant has a designed capacity of 189.27 megaliters and currently discharges 151.42 megaliters annually. As a secondary treatment facility, it uses biological processes to reduce organic matter and suspended solids before discharge. For small communities like Columbia, secondary treatment is the standard requirement under the National Pollutant Discharge Elimination System (NPDES) permitting program. The treated effluent is discharged into local streams that flow into the Ouachita River basin, eventually reaching the Mississippi River and the Gulf of Mexico. The plant plays a key role in protecting downstream water quality in this ecologically sensitive region, which supports diverse aquatic life and recreational uses.

The plant discharges into local waterways within the Ouachita River basin, which flows into the Mississippi River and ultimately the Gulf of Mexico. The region's aquatic ecosystems support diverse fish and wildlife, making proper wastewater treatment essential for maintaining water quality and habitat health.