Okla. Stat. tit. 11 § 37-102
The municipal governing body may purchase, erect, lease, rent, manage, and maintain any system or part of a system of waterworks and water supply. It may establish and alter the channels of watercourses and may establish and regulate wells, cisterns, aqueducts, and reservoirs of water. The governing body may pass all ordinances, penal or otherwise, that are necessary and proper for the full protection, maintenance, management, and control of said facilities, may make provisions for taxes for these purposes, and may do all things necessary and proper in its discretion to exercise the powers authorized by the Constitution and laws of this state and to further the ability of the municipality to provide water supplies, services, and facilities.
Okla. Stat. tit. 11, § 37-102