Prophetstown STP - Wastewater Treatment Plant in Prophetstown, Illinois

Prophetstown STP is a municipal wastewater treatment facility located in Prophetstown, Illinois, serving a population of approximately 1,793 residents. The plant is situated in Whiteside County, near the Rock River, and operates as part of the region's water infrastructure. The plant provides secondary treatment, which is the standard level required by the U.S. Clean Water Act for municipal facilities of this scale. With a designed capacity of 984.20 volume units and an average discharge volume of 794.94 units, the plant operates below its capacity, indicating adequate headroom for current demand. The treated effluent is discharged into local waterways that drain into the Rock River, a tributary of the Mississippi River. This discharge contributes to the overall water quality of the Mississippi River basin, which supports diverse aquatic life and is a critical water resource for the region.

The plant discharges into the Rock River watershed, which flows into the Mississippi River and ultimately to the Gulf of Mexico. The Rock River supports a variety of fish and wildlife, and its water quality is important for downstream ecosystems, including the Mississippi River's vast floodplain and delta.