STANHOPE STL Wastewater Treatment Plant, Stanhope, Iowa

STANHOPE STL is a municipal wastewater treatment plant located on Main Street in Stanhope, Iowa, serving a population of about 488 residents. The facility operates under the regulatory framework of the United States Clean Water Act, which requires secondary treatment for municipal wastewater discharges to protect water quality. The plant provides secondary treatment, a standard biological process that removes organic matter and suspended solids. With a designed capacity of 227.12 megaliters per year and an annual discharge volume of 151.42 megaliters, the plant operates below its capacity, indicating room for future growth or seasonal variations. The treated effluent is discharged into local waterways that ultimately drain into the Mississippi River basin. The plant plays a key role in protecting downstream aquatic ecosystems by reducing pollutant loads before discharge, supporting the health of rivers and streams in the region.

The plant discharges into local streams that flow into the Iowa River, a tributary of the Mississippi River. The Mississippi River basin supports diverse aquatic life and is a critical migratory corridor for fish and birds. The plant's secondary treatment helps reduce nutrient and organic pollution, mitigating eutrophication risks in downstream waters.