For the purpose of determining the basis for selecting committee members, the following districts of the production area are hereby established:
District No. 1—The counties of Ferry, Stevens, Pend Oreille, Spokane, Whitman, and Lincoln, plus the East Irrigation District of the Columbia Basin Project, plus the area of Grant County not included in either the Quincy or South Irrigation Districts which lies east of township vertical line R27E, plus the area of Adams County not included in either of the South or Quincy Irrigation Districts.
District No. 2—The counties of Kittitas, Douglas, Chelan, and Okanogan, plus the Quincy Irrigation District of the Columbia Basin Project, plus the area of Grant County not included in the East or South Irrigation Districts which lies west of township line R28E.
District No. 3—The counties of Benton, Klickitat, and Yakima.
District No. 4—The counties of Walla Walla, Columbia, Garfield, and Asotin, plus the South Irrigation District of the Columbia Basin Project, plus the area of Franklin County not included in the South District.
District No. 5—All of the remaining counties in the State of Washington not included in Districts No. 1, 2, 3, and 4 of this section.