Okla. Stat. tit. 82, § 1021.3

Petition to organize a groundwater irrigation district - Composition of districts. A. If ten individual permit holders in a proposed groundwater irrigation district desire to provide for the betterment of and the assistance and procurement of conservation grant funding for groundwater irrigation of such irrigable lands, the holders may propose the organization of a groundwater irrigation district by petition pursuant to the Groundwater Irrigation District Act. B. Groundwater irrigation districts shall be comprised of a whole county or whole counties adjacent to one or the other.