EPA Region 6 issued an administrative order under its authority pursuant to City of Muskogee located at Muskogee, Oklahoma. The Administrative Order was issued in response to violations of: Section 1433(a) of the SDWA, 42 U.S.C. ?300i-2, community water systems (CWS) serving communities with populations between 3,301 and 49,999 are required to conduct a Risk and Resilience Assessment (RRA) of its system. Section 1433(a)(3)(A) of the SDWA requires a CWS serving communities with populations between 3,301 and 49,999 to submit a certification of completion to the EPA that it has conducted its RRA on or before June 30, 2021. City of Muskogee must submit RRA certification, and respond to EPA Region 6 by September 24, 2021.