MANLIUS STP - Manlius, Illinois Wastewater Treatment Plant

MANLIUS STP is a municipal wastewater treatment plant located in Manlius, Bureau County, Illinois, United States. The plant serves a small population of 541 residents, reflecting its role in a rural community. It operates under the regulatory framework of the US Clean Water Act, which governs wastewater discharges through the National Pollutant Discharge Elimination System (NPDES) permit program. The plant provides secondary treatment, a standard level for small to medium communities in the US. Its designed capacity is 170.34 million gallons per year, and the actual discharge volume is 147.63 million gallons per year, indicating operational capacity utilization. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The treated effluent is discharged into a local water body, likely a stream or river within the Mississippi River basin, as Manlius is located in the Illinois River watershed. The plant's discharge contributes to the overall water quality management of the region, protecting downstream aquatic ecosystems and supporting the ecological health of the Illinois River and ultimately the Mississippi River.

The plant discharges into a local water body that flows into the Illinois River, a major tributary of the Mississippi River. The Illinois River supports diverse aquatic life, including fish and migratory birds, and is an important ecological corridor. The plant's secondary treatment helps reduce nutrient and organic pollutant loads, mitigating eutrophication risks in downstream waters.