On December 13, 2016, EPA Region 6 issued an Administrative Complaint (APO) under its authority pursuant to Section 309 of the Clean Water Act (CWA) to Circle 9 Resources, LLC (Respondent) located in Maramec, Pawnee County, Oklahoma. The APO was issued in response to a violation of Section 301 of the CWA for discharging brine to waters of the U.S. The APO proposes that the Respondent pay a penalty. Respondent must respond to the EPA Region 6 within 30 days of receipt of the APO.