East Chicago STP Wastewater Treatment Plant, Indiana | Great Lakes Basin

East Chicago STP is a municipal wastewater treatment facility located in East Chicago, Indiana, serving a population of around 33,842. The plant is situated in the industrial Lake Michigan shoreline region, part of the greater Chicago metropolitan area. As a U.S. facility, the plant operates under the Clean Water Act and is regulated via an NPDES permit issued by the Indiana Department of Environmental Management. For a population of this scale, secondary treatment is the federal minimum standard, though many plants in the Great Lakes basin employ additional nutrient removal to protect water quality. The plant's treated effluent discharges into the Lake Michigan watershed, which ultimately drains into the Great Lakes system. Lake Michigan provides drinking water for millions and supports diverse aquatic life, including commercially and recreationally important fish species. The plant plays a key role in protecting this vital freshwater resource from nutrient pollution and pathogens.

The plant discharges into the Lake Michigan basin, part of the Great Lakes system, which holds 20% of the world's surface freshwater. The watershed supports a complex ecosystem including lake trout, whitefish, and migratory birds. Nutrient loading from wastewater is a key concern, as it can contribute to algal blooms and hypoxia in nearshore areas.