OTTUMWA WWTP | Ottumwa, Iowa Wastewater Treatment Plant

OTTUMWA WWTP is a municipal wastewater treatment facility located in Ottumwa, Wapello County, Iowa. It serves a population of about 24,500 people, classifying it as a medium-sized agglomeration under U.S. regulatory frameworks. The plant is situated inland, more than 50 kilometers from the nearest coast. As a U.S. facility, OTTUMWA WWTP operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the Iowa Department of Natural Resources. For a plant of this scale, secondary treatment is typically required, and the permit sets effluent limits to protect water quality. The plant discharges treated effluent into the Des Moines River, which flows southeast to join the Mississippi River near Keokuk. The Mississippi River then drains into the Gulf of Mexico. The receiving waters support diverse aquatic life and are used for recreation and drinking water downstream. The plant's operations are critical to maintaining water quality in the Des Moines River basin.

The Des Moines River flows through central Iowa and joins the Mississippi River, which ultimately reaches the Gulf of Mexico. The river supports a variety of fish species and is an important migratory corridor for birds. Downstream waters are used for municipal supply and recreation, making nutrient and pathogen control essential. The plant's discharge contributes to the overall nutrient load in the Mississippi River basin, which has implications for the Gulf of Mexico hypoxic zone.