AFTON CITY OF STP Wastewater Treatment Plant, Union County, Iowa

AFTON CITY OF STP is a municipal wastewater treatment plant located in Union County, Iowa, United States. The facility serves a small population of 845 residents, reflecting its role in a rural community. The plant is situated inland, far from coastal areas, and its operations are governed by state and federal environmental regulations. The plant provides secondary treatment, a standard level required by the U.S. Clean Water Act for municipal wastewater facilities. It has a designed capacity of 230.91 million gallons per year and currently discharges 227.13 million gallons annually, indicating near-capacity operation. As a small agglomeration, it meets the typical treatment expectations for communities of this size in the United States. 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 water quality and aquatic ecosystems in the region. Its compliance with secondary treatment standards helps reduce nutrient and pollutant loads to receiving waters.

The plant discharges into local streams that flow into the Mississippi River Basin, a major watershed supporting diverse aquatic life and providing water resources for communities. The region's agricultural landscape means the plant's nutrient removal helps mitigate downstream eutrophication risks in the Gulf of Mexico.