GREENVILLE STW - Greenville, Illinois Wastewater Treatment Plant

GREENVILLE STW is a municipal wastewater treatment plant located in Greenville, Bond County, Illinois. Serving an estimated 6,955 residents, the facility is part of the town's essential infrastructure for managing domestic wastewater. The plant operates under the regulatory framework of the United States Clean Water Act, which requires National Pollutant Discharge Elimination System (NPDES) permits for all point source discharges. As a plant serving a small population, typical treatment for facilities of this scale in the U.S. includes secondary treatment, which is the minimum standard under the Clean Water Act. The plant's discharge is regulated by the Illinois Environmental Protection Agency (IEPA), which issues NPDES permits that set effluent limits to protect water quality. The facility's location in a rural area of south-central Illinois places it within a region dominated by agricultural land use. The treated effluent from GREENVILLE STW is discharged into a local waterway that ultimately flows into the Mississippi River basin. The Mississippi River system is one of the largest drainage basins in North America, supporting diverse aquatic ecosystems and providing drinking water for millions. The plant's operations contribute to protecting downstream water quality in this ecologically significant watershed.

The plant discharges into a tributary of the Kaskaskia River, which flows into the Mississippi River. The Mississippi River basin supports a wide range of aquatic life, including fish species such as catfish, bass, and paddlefish, as well as migratory birds along the Mississippi Flyway. The watershed is also important for agriculture and municipal water supplies downstream.