Lindenhurst STP - Wastewater Treatment Plant in Lindenhurst, Illinois

Lindenhurst STP is a wastewater treatment facility located at 2201 Grass Lake Road in Lindenhurst, Illinois, serving a population of around 14,861. The plant operates within Lake County, part of the greater Chicago metropolitan area, and is situated inland near the Illinois-Wisconsin border. As a medium-sized agglomeration, the plant is subject to the U.S. Clean Water Act and National Pollutant Discharge Elimination System (NPDES) permitting requirements. The plant discharges treated wastewater into local waterways that ultimately drain into the Mississippi River Basin. The receiving water body contributes to the ecological health of the region, supporting aquatic life and recreational uses. Proper treatment helps protect downstream water quality in the Mississippi River system.

The plant discharges into local streams that flow into the Fox River, a tributary of the Illinois River, which joins the Mississippi River. This watershed supports diverse aquatic species and provides habitat for migratory birds. The region's inland location means effluent impacts are primarily on freshwater ecosystems rather than coastal environments.