On August 20, 2012, EPA Region 6 issued an Administrative Order (AO) under its authority pursuant to Sections 308 and 309 of the Clean Water Act (CWA) to Chaparral Energy, LLC (Chaparral) located in Osage County, OK. The AO was issued to address an unauthorized discharge of oil field brine and produced wastewater to a water of the U.S. The AO requires Chaparral to: 1) Cease all discharges of pollutants from the facility;
2) remove all brine from the flow path from the facility to the tributary of Clear Creek; and 3) remove all brine from the tributary of Clear Creek which was discharged on or about July 20, 2012. Chaparral must respond to EPA Region 6 within thirty (30) days of receiving this AO.