Libertyville STP - Wastewater Treatment Plant in Libertyville, Illinois

Libertyville STP is a municipal wastewater treatment facility located in Libertyville, Illinois, serving a population of about 22,500. The plant is situated in Lake County, part of the Chicago metropolitan area, and operates under the regulatory framework of the U.S. Clean Water Act. As a medium-sized agglomeration, the plant is expected to provide secondary treatment as a minimum under federal guidelines. The facility's designed capacity is 1.00 million gallons per day, indicating it is sized to handle the community's wastewater needs. The plant's discharge is regulated through the National Pollutant Discharge Elimination System (NPDES) permit program, administered by the Illinois Environmental Protection Agency. The treated effluent from Libertyville STP flows into the Des Plaines River, a major tributary of the Illinois River, which ultimately drains into the Mississippi River and the Gulf of Mexico. The plant plays a key role in protecting the water quality of the Des Plaines River and downstream ecosystems, including Lake Michigan, which is a critical freshwater resource for the region.

Libertyville STP discharges into the Des Plaines River, which flows into the Illinois River and then the Mississippi River, eventually reaching the Gulf of Mexico. The plant's location in the Lake Michigan watershed means its effluent can impact the Great Lakes ecosystem, which supports diverse aquatic life and provides drinking water for millions. Protecting this watershed from nutrient pollution and contaminants is essential for maintaining water quality and ecological health.