Romeoville WWTP and Collection System: Illinois Wastewater Treatment

The Romeoville WWTP and Collection System is a municipal wastewater treatment facility located in Romeoville, Illinois, serving a population of about 39,600. The plant is part of the region's infrastructure managed by local authorities, ensuring compliance with federal and state regulations. As a medium-sized agglomeration, the plant is expected to provide at least secondary treatment under the U.S. Clean Water Act. The National Pollutant Discharge Elimination System (NPDES) permit program governs its discharge, with permits issued by the Illinois Environmental Protection Agency. These permits set limits on pollutants to protect water quality. The treated effluent is discharged into local waterways that ultimately flow into the Mississippi River basin. The plant plays a key role in protecting the Des Plaines River and downstream ecosystems, including the Illinois River and the Gulf of Mexico, by reducing nutrient and pollutant loads.

The plant discharges into the Des Plaines River watershed, which flows into the Illinois River and eventually the Mississippi River and the Gulf of Mexico. This downstream chain supports diverse aquatic life and is a critical migratory corridor for birds and fish. The region's industrial and agricultural activities contribute nutrient loads, making effective treatment essential to prevent eutrophication and hypoxia in the Gulf.