Okla. Stat. tit. 63, § 142.3

All operators of underground facilities shall participate in the statewide one-call notification center and shall have on file with the notification center a notice that such operator has underground facilities, the county or counties where such facilities are located, and the address and telephone number of the person or persons from whom information about such underground facilities may be obtained. A municipality shall participate in the statewide one- call notification center as provided for in this section.