Okla. Stat. tit. 82, § 1618

The provisions of the Oklahoma Floodplain Management Act shall not apply to those counties, municipalities or other agencies which are in compliance with federal floodplain regulations as of the date of this act and were participating in the program prior to May 13, 1980. Beginning November 1, 2005, persons designated to administer the floodplain requirements of the counties, municipalities or other agencies exempt from the Oklahoma Floodplain Management Act pursuant to this section shall be accredited by the Oklahoma Water Resources Board in the same manner as the Board accredits floodplain administrators.