Olla WWTP - Secondary Wastewater Treatment in Olla, Louisiana

Olla WWTP is a municipal wastewater treatment plant located in Olla, LaSalle Parish, Louisiana. Serving a population of approximately 1,410 residents, the facility is part of the region's infrastructure for managing domestic wastewater in a rural setting. The plant provides secondary treatment, which is the standard level required under the U.S. Clean Water Act for municipal facilities. With a designed capacity of 681.37 thousand gallons per day and an average discharge volume of 605.67 thousand gallons per day, the plant operates within its capacity. As a U.S. facility, it operates under a National Pollutant Discharge Elimination System (NPDES) permit issued by the Louisiana Department of Environmental Quality, ensuring compliance with effluent limits. The treated effluent is discharged into a local waterway that flows through the Ouachita River basin, ultimately reaching the Mississippi River and the Gulf of Mexico. The plant plays a key role in protecting downstream water quality and aquatic habitats in this inland watershed.

The plant discharges into a tributary of the Ouachita River, which flows south through Louisiana to the Mississippi River and into the Gulf of Mexico. This inland watershed supports diverse aquatic life and is important for regional water quality. The secondary treatment process reduces organic pollutants and suspended solids, helping to maintain the ecological health of the receiving waters.