ZWOLLE STP - Advanced Wastewater Treatment Plant in Zwolle, Louisiana

ZWOLLE STP is an advanced wastewater treatment facility located in Zwolle, Sabine Parish, Louisiana, United States. The plant serves a population of about 1,780 people and is situated near the Toledo Bend Reservoir, a major regional water body. As an advanced treatment plant, it goes beyond secondary treatment to remove nutrients and other pollutants, ensuring high-quality effluent. The plant has a designed capacity of 3,028.32 cubic meters per day and currently discharges approximately 662.45 cubic meters per day. Under the U.S. Clean Water Act, such facilities operate under National Pollutant Discharge Elimination System (NPDES) permits issued by the Louisiana Department of Environmental Quality, which set limits on effluent quality to protect receiving waters. The treated effluent from ZWOLLE STP likely discharges into a tributary of the Sabine River, which flows southward to Sabine Lake and eventually the Gulf of Mexico. The plant's advanced treatment helps protect the ecologically sensitive Sabine River basin, which supports diverse aquatic life and provides habitat for migratory birds and fish species.

ZWOLLE STP discharges into the Sabine River watershed, which drains into Sabine Lake and then the Gulf of Mexico. The Sabine River basin is ecologically significant, supporting diverse fish populations and serving as a migratory corridor for waterfowl. The plant's advanced treatment helps reduce nutrient loading, protecting downstream water quality in this important coastal ecosystem.