Joliet Aux Sable Creek Basin WWTP - Wastewater Treatment in Joliet, Illinois

The Joliet Aux Sable Creek Basin WWTP is a municipal wastewater treatment facility located in Joliet, Illinois, along the DuPage River Trail. It serves a population of about 14,000 residents in the Troy Township area of Will County. As a medium-sized plant, it plays a key role in managing wastewater for this part of the Chicago metropolitan region. Under the U.S. Clean Water Act, wastewater treatment plants of this scale are typically required to meet secondary treatment standards through National Pollutant Discharge Elimination System (NPDES) permits issued by the Illinois Environmental Protection Agency. These permits set limits on biochemical oxygen demand, total suspended solids, and other pollutants to protect water quality. The plant's treated effluent is discharged into the DuPage River, which flows into the Illinois River and ultimately reaches the Mississippi River. This waterway supports diverse aquatic life and is used for recreation and drinking water downstream. Proper treatment helps maintain the ecological health of the river system.

The plant discharges into the DuPage River, a tributary of the Illinois River, which flows into the Mississippi River. The DuPage River watershed supports a variety of fish and macroinvertebrate species and is an important corridor for migratory birds. The plant's operations help protect downstream water quality in the Illinois River basin, which supplies drinking water to millions and supports commercial navigation.