Calumet WRP - Chicago, Illinois Wastewater Treatment Plant

Calumet WRP (Water Reclamation Plant) is a large-scale wastewater treatment facility located in the Riverdale neighborhood of Chicago, Illinois. Serving a population of approximately 1.14 million, it is one of the major treatment plants in the Chicago metropolitan area, managed by the Metropolitan Water Reclamation District of Greater Chicago. As a large agglomeration serving over 1 million people, Calumet WRP is subject to stringent federal and state regulations under the US Clean Water Act, including National Pollutant Discharge Elimination System (NPDES) permits. The plant's designed capacity is 1.00 million gallons per day, and it provides advanced treatment to protect public health and the environment. The plant discharges treated wastewater into the Calumet River system, which flows through the Calumet-Saganashkee Channel and eventually into Lake Michigan. This water body is a critical resource for drinking water, recreation, and aquatic habitat in the Great Lakes region. The plant's operations are essential for maintaining water quality in the Chicago Area Waterway System and the broader Lake Michigan basin.

Calumet WRP discharges into the Calumet River, a tributary of the Calumet-Saganashkee Channel, which connects to the Chicago Sanitary and Ship Canal and ultimately flows into Lake Michigan. Lake Michigan is a major freshwater resource supporting diverse aquatic life, including fish species such as lake trout and whitefish, and provides drinking water for millions. The plant's effluent must meet strict nutrient and pollutant limits to prevent eutrophication and protect the lake's ecosystem.