FREEPORT STP - Freeport, Illinois Wastewater Treatment Plant

FREEPORT STP is a municipal wastewater treatment plant located in Freeport, Illinois, serving a population of about 27,218. The facility is situated in Stephenson County and is part of the city's infrastructure for managing domestic and industrial wastewater. As a plant in the United States, FREEPORT STP operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the Illinois Environmental Protection Agency. For a population of this scale, secondary treatment is typically required, and the plant is expected to meet effluent limits for biochemical oxygen demand and total suspended solids. The treated effluent from FREEPORT STP is discharged into a receiving water body that flows into the Pecatonica River, a tributary of the Rock River. The Rock River ultimately drains into the Mississippi River, supporting diverse aquatic life and providing water for communities downstream. The plant plays a key role in protecting local water quality and the broader Mississippi River watershed.

FREEPORT STP discharges into a local stream that flows into the Pecatonica River, a tributary of the Rock River. The Rock River joins the Mississippi River, which is a major ecological corridor supporting fish, migratory birds, and other wildlife. The plant's effluent quality is critical for maintaining the health of these water bodies, which are used for recreation and as a drinking water source downstream.