Downers Grove SD and COLL SYST Wastewater Treatment Plant, Downers Grove, Illinois

The Downers Grove SD and COLL SYST wastewater treatment plant serves approximately 60,000 residents in Downers Grove, Illinois, a suburb of Chicago. Located in DuPage County, the facility is part of the region's municipal wastewater infrastructure, treating domestic sewage from the community. As a US-based plant serving a medium-sized agglomeration, it operates under the Clean Water Act's National Pollutant Discharge Elimination System (NPDES) permit program. The plant's designed capacity is 1.00 million gallons per day, and it is expected to meet secondary treatment standards as required by federal regulations for municipal wastewater facilities. The plant discharges treated effluent into local waterways that ultimately drain into the Des Plaines River, a tributary of the Illinois River, which flows into the Mississippi River. This watershed supports diverse aquatic life and provides important ecological functions in the Chicago metropolitan area.

The plant's treated effluent enters the local drainage network that flows into the Des Plaines River, a major waterway in northeastern Illinois. The Des Plaines River joins the Kankakee River to form the Illinois River, which eventually reaches the Mississippi River. This watershed supports a variety of fish and wildlife species and is an important corridor for migratory birds. The plant's discharge must meet water quality standards to protect downstream aquatic ecosystems.