Okla. Stat. tit. 59, § 1104

The Environmental Quality Board shall have the power and duty to promulgate such rules, including requirements, restrictions and conditions relating to the hiring or contracting of licensed public water supply or wastewater operators pursuant to the provisions of Section 2 of this act and the establishment of a fee schedule pursuant to Section 2-3-402 of Title 27A of the Oklahoma Statutes, as it may deem necessary to the carrying out of the provisions and purposes of the Waterworks and Wastewater Works Operator Certification Act.