Wisner Lagoon Wastewater Treatment Plant, Franklin Parish, Louisiana

Wisner Lagoon is a wastewater treatment facility located in Franklin Parish, Louisiana, United States. The plant serves a small community of approximately 1,112 residents, providing advanced treatment to ensure effluent quality meets regulatory standards. As a lagoon-based system, it utilizes natural processes to treat wastewater before discharge. The plant operates with an advanced treatment level, which goes beyond secondary treatment to remove nutrients and other pollutants. With a designed capacity of 359.61 thousand gallons per day and a current discharge volume of 340.69 thousand gallons per day, it operates near its capacity. Under the U.S. Clean Water Act, such facilities are regulated through National Pollutant Discharge Elimination System (NPDES) permits, which set effluent limits to protect water quality. The treated effluent from Wisner Lagoon is discharged into local streams and rivers that are part of the Mississippi River basin. These waters eventually flow into the Gulf of Mexico, contributing to the nutrient dynamics of the region. The plant plays a key role in protecting downstream aquatic ecosystems and maintaining water quality in the surrounding watershed.

Wisner Lagoon discharges into local waterways that are part of the larger Mississippi River basin, which ultimately drains into the Gulf of Mexico. The region's aquatic ecosystems support diverse fish and wildlife, and the plant's advanced treatment helps reduce nutrient loading that can contribute to hypoxic zones in the Gulf. The facility's location in rural Louisiana means it serves a community reliant on healthy water resources for agriculture and recreation.