Sumner WWTP - Advanced Wastewater Treatment in Bremer County, Iowa

Sumner WWTP is a municipal wastewater treatment facility located in Bremer County, Iowa, serving a population of approximately 2,078 residents. The plant operates under the regulatory framework of the U.S. Clean Water Act, which requires National Pollutant Discharge Elimination System (NPDES) permits for all discharges to surface waters. As an advanced treatment plant, it goes beyond secondary treatment standards to achieve higher removal of nutrients and other pollutants. The plant has a designed capacity of 791.15 megaliters and currently discharges 946.35 megaliters of treated wastewater annually, indicating it operates near or at its design capacity. Advanced treatment typically involves biological nutrient removal, filtration, or disinfection steps to meet stringent effluent limits. The treated effluent is discharged to a local water body within the Upper Mississippi River Basin, which ultimately drains to the Mississippi River and then to the Gulf of Mexico. The plant's advanced treatment helps protect downstream water quality and supports the ecological health of the region's streams and rivers.

Sumner WWTP discharges into a tributary of the Upper Mississippi River Basin, which flows into the Mississippi River and eventually the Gulf of Mexico. The receiving waters support diverse aquatic life and are part of a larger watershed that faces challenges from nutrient pollution. Advanced treatment at this plant helps reduce nutrient loads, contributing to the health of downstream ecosystems and mitigating hypoxic conditions in the Gulf.