On December 2, 2014, 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, Inc. (Respondent) located in Shidler, OK. The AO was issued in response to an unauthorized produced water discharge resulting in a violation of the CWA. The AO requires Respondent to (1) Immediately cease all discharges of pollutants from the facility; (2)remove all produced wastewater from the flow path located between the facility and the discharge point of entry into Mud Creek; and (3) remove all produced wastewater from Mud Creek, which was discharged from the facility on or about August 13, 2014. Respondent must respond to EPA Region 6 within 30 days of receiving this AO.