Okla. Stat. tit. 19 § 877
The board of directors is hereby authorized and empowered to take conveyances and other assurance for all property acquired by it under this act in the name of such sewer improvement district, to and for the uses and purposes herein expressed, and to institute and maintain any and all actions and proceedings, suits at law or in equity, necessary or proper in order to fully carry out the provisions of this act or to enforce, maintain, protect or preserve any and all rights, privileges and immunities created by this act, or acquired in pursuance thereof. Any such board may sue, appear and defend in its corporate name, in person or by attorneys, in all courts, actions, suits or proceedings in the name of such sewer improvement district, and may employ attorneys for such purposes.
Okla. Stat. tit. 19, § 877