Winslow WTP Wastewater Treatment Plant, Winslow, Illinois

Winslow WTP is a municipal wastewater treatment plant located in Winslow, Illinois, United States. It serves a small population of 363 residents, reflecting its role as a local facility for this rural community in Stephenson County. The plant provides secondary treatment, which is the standard level required by the US Clean Water Act for municipal wastewater facilities. With a designed capacity of 189.27 megaliters per year and an annual discharge volume of 113.56 megaliters, the plant operates within its capacity. As a US facility, it is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the Illinois Environmental Protection Agency, ensuring compliance with effluent limits. The treated effluent is discharged into local waterways that drain into the Pecatonica River watershed, part of the larger Rock River basin, which ultimately flows into the Mississippi River. This connection to the Mississippi River system underscores the plant's role in protecting downstream aquatic ecosystems and water quality in the region.

The plant discharges into the Pecatonica River watershed, which flows into the Rock River and then the Mississippi River. This river system supports diverse aquatic life and is an important migratory corridor for fish and birds. The secondary treatment process helps reduce organic pollutants and suspended solids, protecting the ecological health of these downstream waters.