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The Terrence J. O'Brien Water Reclamation Plant (WRP) began operation in 1928 and was a model for modern sewage treatment technology. The plant serves an upwards of 1.3 million people in Chicago and the 17 suburbs of Cook County. The plant processes 230 million gallons of wastewater per day, but has the capacity to process up to 450 million gallons. Read more here: https://legacy.mwrd.org/irj/servlet/prt/portal/prtroot/pcd!3aportal_content!2fMWRD!2fMWRDInternet!2fRoles!2fServices_Facilities!2fWaterReclamation!2fNorthSideWRP!2fNorthSideWRP