Galesburg Sanitary District Wastewater Treatment Plant, Knox County, Illinois

Galesburg Sanitary District is a municipal wastewater treatment plant located in Knox County, Illinois, serving a population of about 39,000. The facility is situated near the Galesburg Regional Airport and is part of the region's infrastructure for managing domestic and industrial wastewater. As a U.S. plant of this scale, it operates under the Clean Water Act, requiring an NPDES permit issued by the Illinois Environmental Protection Agency. Such permits set effluent limits to protect water quality, and secondary treatment is typically mandated for municipal plants serving populations over 10,000. The plant's treated effluent is discharged into local waterways that ultimately drain into the Mississippi River basin. This watershed supports diverse aquatic life and is a critical resource for communities downstream, making proper treatment essential for ecological health.

The plant discharges into tributaries of the Mississippi River basin, which flows into the Gulf of Mexico. This watershed supports a variety of fish and wildlife, and nutrient management is important to prevent downstream hypoxia. The region's agricultural land use can contribute to nutrient loads, making the plant's treatment role significant.