Sabula STP - Secondary Wastewater Treatment Plant in Sabula, Iowa

Sabula STP is a municipal wastewater treatment facility located in Sabula, Iowa, a small city on the Mississippi River. The plant serves a population of approximately 574 residents, reflecting the scale of a small community in the Midwestern United States. The plant provides secondary treatment, which is the standard level required under the U.S. Clean Water Act for municipal facilities. With a designed capacity of 794.93 cubic meters per day and an average discharge volume of 302.83 cubic meters per day, the plant operates well within its capacity. As a U.S. facility, it operates under a National Pollutant Discharge Elimination System (NPDES) permit issued by the Iowa Department of Natural Resources, ensuring compliance with federal and state water quality standards. The treated effluent is discharged into the Mississippi River, one of the largest river systems in North America. The plant plays a key role in protecting the river's water quality downstream, including the Upper Mississippi River ecosystem, which supports diverse aquatic life and serves as a critical migratory corridor for birds and fish.

Sabula STP discharges into the Mississippi River, which flows southward to the Gulf of Mexico. The Upper Mississippi River is ecologically significant, supporting diverse fish and wildlife habitats, including backwater sloughs and floodplain forests. The plant's secondary treatment helps reduce nutrient and pollutant loads, contributing to the health of this major waterway.