Okla. Stat. tit. 82, § 82-105.5: Impairment of water rights - Suits in district court

Any person having a right to the use of water from a stream as

defined by this act or Section 60 in Title 60 of the Oklahoma

Statutes whose right is impaired by the act or acts of another, or

others, may bring suit in the district court of any county in which

any of the acts complained of occurred. Provided, however, that

nothing herein contained shall be construed to empower district

courts to recognize rights to use the water of a stream unless such

rights have heretofore been established pursuant to this act or are

claimed under Section 60 in Title 60 of the Oklahoma Statutes.

Provided, however, that the Attorney General shall intervene on

behalf of the state in any suit for the adjudication of rights to

the use of water if notified by the Board that the public interests

would be best served by such action.