Okla. Stat. tit. 19, § 901.9

The board of directors is hereby authorized and empowered to institute and maintain, or appear and defend, any and all actions and proceedings, suits at law or in equity, necessary or proper to fully carry out the provisions of this act, or to enforce, maintain, protect or preserve any and all rights or privileges conferred hereby, or acquired in pursuance hereof. Actions and proceedings shall be prosecuted and defended in the corporate name of the district, and the board is empowered to employ attorneys to represent the district in any such actions or proceedings, or to advise the board in respect of its duties under this act.