South WWTP Luling | Secondary Wastewater Treatment in Luling, Texas

South WWTP Luling is a municipal wastewater treatment facility located on Club Drive in Luling, Caldwell County, Texas. The plant serves a population of approximately 2,700 residents, classifying it as a small-scale treatment facility within the state's wastewater infrastructure. The plant provides secondary treatment, which is the standard level required by the US Clean Water Act for most municipal facilities. With a designed capacity of 1,892.70 cubic meters per day and an average discharge volume of 984.21 cubic meters per day, the plant operates at roughly 52% capacity. As a US facility, it operates under an EPA National Pollutant Discharge Elimination System (NPDES) permit issued by the Texas Commission on Environmental Quality, which sets effluent limits to protect water quality. The treated effluent from South WWTP Luling discharges into the San Marcos River watershed, which flows into the Guadalupe River and eventually to the San Antonio Bay and the Gulf of Mexico. The plant plays a key role in protecting the local aquatic ecosystem and downstream water quality in the Guadalupe River basin.

South WWTP Luling discharges into the San Marcos River, a tributary of the Guadalupe River, which flows into the San Antonio Bay and the Gulf of Mexico. The Guadalupe River basin supports diverse aquatic life, including several fish species and migratory birds. The plant's secondary treatment helps reduce nutrient loads and organic pollutants, protecting downstream habitats from eutrophication and maintaining water quality for recreational and ecological uses.