Indianapolis Southport WWTP - Major Wastewater Treatment Plant in Indianapolis, Indiana

Indianapolis Southport WWTP is a major wastewater treatment facility located in Indianapolis, Marion County, Indiana. It serves a population of approximately 310,000, classifying it as a large agglomeration under US regulatory standards. The plant is situated along the South White River Parkway West Drive, near the White River. As a large municipal plant in the United States, it operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the Indiana Department of Environmental Management. These permits set effluent limits to protect water quality. Plants of this scale typically employ secondary treatment as a minimum, with potential advanced treatment for nutrient removal. The plant's treated effluent is discharged into the White River, which flows southward to join the Wabash River, then the Ohio River, and ultimately the Mississippi River to the Gulf of Mexico. The White River watershed supports diverse aquatic life and is an important ecological corridor in central Indiana. The plant plays a critical role in maintaining water quality in this river system.

The plant discharges into the White River, a major tributary of the Wabash River, which flows into the Ohio River and then the Mississippi River to the Gulf of Mexico. The White River watershed supports diverse aquatic species and provides habitat for fish and wildlife. Downstream ecosystems benefit from the plant's treatment, which helps reduce nutrient loading and protect water quality in this ecologically significant river system.