Okla. Stat. tit. 11, § 11-37-117: Acquiring lands and water for future needs - Sale

outside corporate limits no defense.

Any municipality owning and operating or proposing to own and

operate a system of waterworks to supply the municipality, and the

inhabitants thereof with water may provide for its contemplated

future water and waterworks requirements, in advance of its

immediate needs. For that purpose the governing body may acquire

lands and water both within and without the corporate limits of the

municipality and within the State of Oklahoma. Such municipalities

are vested with the power of eminent domain for that purpose, such

power to be exercised in the manner provided by law for the

condemnation of lands by municipalities for waterworks purposes. It

shall be no defense against the exercise of such power or eminent

domain that the municipality is selling and furnishing water to

other municipalities or to persons, firms or corporations without

the corporate limits of the municipality.