Creve Coeur STP - Wastewater Treatment Plant in Creve Coeur, Illinois

Creve Coeur STP is a municipal wastewater treatment plant located in Creve Coeur, Illinois, a village in Tazewell County. The facility serves a population of about 9,500 people, placing it in the small-to-medium agglomeration category. As a U.S. plant, it operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permitting, typically administered by the Illinois Environmental Protection Agency. The plant's treatment process and capacity details are not publicly available in this dataset, but facilities of this scale in the U.S. are generally required to provide secondary treatment to meet water quality standards. The plant discharges treated wastewater into a local waterway that ultimately drains into the Illinois River, a major tributary of the Mississippi River. This river system supports diverse aquatic life and is an important migratory corridor for fish and birds. The plant's location inland, away from coastal areas, reduces direct marine discharge risks, but its effluent still impacts the freshwater ecosystem of the Illinois River basin.

The treated effluent from Creve Coeur STP flows into a local stream or drainage network that feeds into the Illinois River, which then joins the Mississippi River. The Mississippi River system is one of the largest in North America, supporting a wide range of aquatic species and providing critical habitat for migratory waterfowl. The plant's discharge contributes to the nutrient load in the river, which can affect downstream water quality and contribute to the hypoxic zone in the Gulf of Mexico. The local watershed is primarily agricultural and urban, with potential for runoff containing fertilizers and other pollutants.