CATLIN STP - Advanced Wastewater Treatment in Catlin, Illinois

CATLIN STP is an advanced wastewater treatment facility located in Catlin, Illinois, a small community in Vermilion County. The plant serves a population of approximately 2,317 residents and is part of the municipal infrastructure managed by local authorities. The plant employs advanced treatment processes, which go beyond secondary treatment to remove nutrients and other pollutants. With a designed capacity of 1,514.16 cubic meters per day and an average daily flow of 908.50 cubic meters, the facility operates well within its capacity. Under the U.S. Clean Water Act, such plants are regulated through National Pollutant Discharge Elimination System (NPDES) permits issued by the Illinois Environmental Protection Agency, ensuring compliance with water quality standards. The treated effluent from CATLIN STP is discharged into a local waterway that ultimately drains into the Vermilion River, a tributary of the Wabash River, which flows into the Ohio River and then the Mississippi River. This downstream connection highlights the plant's role in protecting the broader watershed and the aquatic ecosystems that depend on clean water.

CATLIN STP discharges into a local stream that feeds the Vermilion River, part of the Wabash River basin. The Wabash River flows into the Ohio River, which joins the Mississippi River before reaching the Gulf of Mexico. The plant's advanced treatment helps protect downstream aquatic habitats, including fish spawning grounds and migratory corridors, by reducing nutrient loads that could cause eutrophication.