MARENGO STP Wastewater Treatment Plant, Marengo, Illinois

MARENGO STP is a municipal wastewater treatment plant located in Marengo, McHenry County, Illinois. Serving a population of around 7,637, the facility is part of the region's infrastructure for managing domestic wastewater from the community. As a small to medium-sized plant, MARENGO STP is subject to the US Clean Water Act and National Pollutant Discharge Elimination System (NPDES) permitting, administered by the Illinois Environmental Protection Agency. Such facilities typically employ secondary treatment processes to meet effluent limits that protect water quality. The plant's treated effluent discharges into local streams that drain into the Kishwaukee River, a tributary of the Rock River, which ultimately flows into the Mississippi River. This watershed supports diverse aquatic life and provides recreational and ecological value to northern Illinois.

MARENGO STP discharges into the Kishwaukee River watershed, which flows into the Rock River and then the Mississippi River. This river system supports diverse fish populations and provides habitat for migratory birds. The plant's operations are important for maintaining water quality in this ecologically sensitive region, which is part of the Upper Mississippi River Basin.