Roxana Village of Wastewater Treatment Plant, South Roxana, Illinois

The Roxana Village of wastewater treatment plant is located in South Roxana, Illinois, a community in Madison County. The facility serves a population of approximately 4,800 residents, placing it in the small-to-medium agglomeration category under US regulatory standards. As a US-based plant, it operates under the Clean Water Act, administered by the Illinois Environmental Protection Agency (IEPA). Plants of this scale typically require secondary treatment as a minimum standard, with National Pollutant Discharge Elimination System (NPDES) permits governing discharge limits to protect water quality. The plant's treated effluent is discharged into local waterways that ultimately drain into the Mississippi River system. The Mississippi River watershed supports diverse aquatic life and provides drinking water for millions downstream, making effective wastewater treatment critical for maintaining water quality in this major river basin.

The plant discharges into tributaries of the Mississippi River, which flows into the Gulf of Mexico. The Mississippi River basin is one of the largest watersheds in North America, supporting extensive aquatic ecosystems and providing habitat for numerous fish and migratory bird species. Effective treatment helps reduce nutrient loading that can contribute to hypoxic zones in the Gulf.