Okla. Stat. tit. 82 § 105.5
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.
Okla. Stat. tit. 82, § 105.5