BLUFFS STP - Secondary Wastewater Treatment Plant in Bluffs, Illinois

BLUFFS STP is a municipal wastewater treatment facility located in Bluffs, Illinois, a small community in Scott County. The plant provides secondary treatment to wastewater from the local population of about 826 residents, ensuring compliance with environmental standards. As a secondary treatment plant, BLUFFS STP utilizes biological processes to remove organic matter and suspended solids from wastewater. The plant's designed capacity of 529,960 gallons per day allows for adequate treatment of current flows, with an average daily discharge of 340,690 gallons. Under the U.S. Clean Water Act, such facilities operate under National Pollutant Discharge Elimination System (NPDES) permits issued by the Illinois Environmental Protection Agency, which set effluent limits to protect water quality. The treated effluent from BLUFFS STP is discharged into a local waterway that ultimately drains into the Illinois River watershed. The Illinois River flows into the Mississippi River, which empties into the Gulf of Mexico. The plant plays a key role in protecting downstream aquatic ecosystems by reducing nutrient and pollutant loads.

The treated effluent from BLUFFS STP enters a tributary of the Illinois River, which flows into the Mississippi River and eventually reaches the Gulf of Mexico. The Illinois River watershed supports diverse aquatic life and is an important migratory corridor for fish and birds. Nutrient loading from wastewater discharges can contribute to algal blooms and hypoxia in the Gulf, making effective treatment critical for downstream water quality.