MILLEDGEVILLE STP - Secondary Wastewater Treatment Plant in Milledgeville, Illinois

MILLEDGEVILLE STP is a municipal wastewater treatment plant located in Milledgeville, Carroll County, Illinois. The facility serves a population of approximately 1,183 residents, classifying it as a small-scale treatment operation within the state's wastewater infrastructure network. The plant provides secondary treatment, which is the standard level required under the U.S. Clean Water Act for municipal facilities of this size. Secondary treatment typically involves biological processes to remove organic matter and suspended solids, ensuring effluent meets federal and state water quality standards before discharge. The plant's designed capacity is 757.08 cubic meters per day, with a corresponding discharge volume, indicating it operates at full capacity. The treated effluent is discharged into local surface waters that ultimately drain into the Rock River basin, a tributary of the Mississippi River. This watershed supports diverse aquatic life and provides recreational and drinking water resources downstream. The plant's operation helps protect water quality in the region's streams and rivers.

The plant discharges into the Rock River watershed, which flows into the Mississippi River and eventually the Gulf of Mexico. This basin supports a variety of fish and wildlife, including migratory birds and aquatic species. The secondary treatment process reduces organic pollutants and suspended solids, helping to maintain the ecological health of the receiving waters and downstream environments.