Idaho Conservation League (“ICL”) petitioned the Environmental Appeals Board (“Board”) to review certain effluent limitations in a National Pollutant Discharge Elimination System permit issued to the City of Homedale, Idaho, authorizing discharges from its wastewater treatment plant to the Snake River. The U.S. Environmental Protection Agency, Region 10, issued the permit on August 28, 2013, pursuant to Clean Water Act § 402, 33 U.S.C. § 1342.