In April 2010, ArcelorMittal Cleveland Inc. requested that the Ohio Environmental Protection Agency (Ohio EPA), which administers the Clean Water Act (CWA) National Pollutant Discharge Elimination System permit program in Ohio, approve an increase in the current permit limits for ammonia-nitrogen discharges from two iron blast furnaces at Arcelor’s Cleveland steel mill. Ohio EPA agreed that Arcelor’s proposed new limits would meet the water quality protection and other requirements of applicable law, and proposed to approve the requested increase.