IOLA WWTP - Allen County, Kansas Wastewater Treatment Plant

IOLA WWTP is a municipal wastewater treatment facility located in Allen County, Kansas, serving a population of approximately 6,300 residents. The plant is situated in a rural inland area of eastern Kansas, where it manages wastewater from the local community. As a US facility serving a population under 10,000, IOLA WWTP is subject to EPA National Pollutant Discharge Elimination System (NPDES) permitting, administered by the Kansas Department of Health and Environment. The Clean Water Act requires secondary treatment as a baseline for municipal plants, with additional nutrient controls where water quality concerns exist. The plant discharges treated effluent into a local waterway that ultimately drains into the Neosho River basin, part of the Arkansas River watershed flowing to the Mississippi River and Gulf of Mexico. The receiving waters support aquatic life and are used for recreation and agriculture downstream.

IOLA WWTP discharges into a tributary of the Neosho River, which flows through southeastern Kansas into Oklahoma and joins the Arkansas River. This watershed supports diverse aquatic species and provides water for irrigation and municipal use. The plant's effluent contributes to the nutrient load in the basin, which ultimately reaches the Gulf of Mexico, where excess nutrients contribute to seasonal hypoxia.