Bloomington Normal Southeast New Wastewater Treatment Plant, Bloomington, Illinois

The Bloomington Normal Southeast New wastewater treatment plant is located in Bloomington, McLean County, Illinois, serving a population of around 48,490 residents. As a municipal facility in the Midwestern United States, it plays a key role in managing wastewater from the Bloomington-Normal metropolitan area. Under the U.S. Clean Water Act, plants of this scale are typically required to meet secondary treatment standards through the National Pollutant Discharge Elimination System (NPDES) permitting program. The Illinois Environmental Protection Agency oversees permits and compliance for such facilities, ensuring treated effluent meets water quality standards before discharge. The plant's treated effluent likely discharges into a tributary of the Illinois River basin, which flows into the Mississippi River and ultimately the Gulf of Mexico. This watershed supports diverse aquatic life and is an important corridor for migratory fish species.

The plant's discharge enters the Illinois River watershed, a major tributary of the Mississippi River. The downstream environment includes the Mississippi River and the Gulf of Mexico, where nutrient loading from upstream sources can contribute to hypoxic zones. The local watershed supports agricultural and urban runoff, making effective treatment critical for protecting aquatic ecosystems and downstream water quality.