(January 25, 2018, 12:25 PM EST) -- HAMMOND, Ind. — The city of Chicago on Jan. 24 sued U.S. Steel Corp. in an Indiana federal court, contending that it is liable for “multiple excessive discharges of toxic chemicals” into Lake Michigan, which is the source of drinking water for more than 5 million people and arguing that U.S. Steel has committed “repeated and significant” violations of its permits under the Clean Water Act (CWA), 33 U.S.C. §§ 1251-1387 (City of Chicago v. United States Steel Corporation, No. 18-33, N.D. Ind.)....