BDM Sewer Commission STP - Secondary Wastewater Treatment in Sangamon County, Illinois

BDM Sewer Commission STP is a municipal wastewater treatment facility located in Sangamon County, Illinois, serving a population of approximately 1,471 residents. The plant provides secondary treatment, a standard level for small communities in the United States, ensuring effective removal of organic matter and suspended solids before discharge. The plant's designed capacity is 757.08 million gallons per year, with an actual discharge volume of 681.37 million gallons per year, indicating operational efficiency. As a US facility, it operates under the Clean Water Act, with National Pollutant Discharge Elimination System (NPDES) permits issued by the Illinois Environmental Protection Agency, which set effluent limits to protect water quality. The treated effluent is discharged into local streams that flow into the Sangamon River, a tributary of the Illinois River, which ultimately drains into the Mississippi River. This watershed supports diverse aquatic life and provides drinking water for downstream communities, making the plant's consistent treatment performance critical for regional water quality.

The plant discharges into local waterways that feed the Sangamon River, part of the Illinois River basin, which flows into the Mississippi River. This watershed supports a variety of fish and wildlife, including migratory birds and freshwater mussels. The plant's secondary treatment helps reduce nutrient loads that could otherwise contribute to algal blooms in downstream rivers and the Gulf of Mexico hypoxic zone.