S.D. Codified Laws § 10-11-66
In lieu of the local board of equalization and county board of equalization established and governed pursuant to §§ 10-11-13 to 10-11-31, inclusive, the governing boards of any county, municipality, school, and township may agree by resolution to consolidate the local board of equalization with the county board of equalization no later than the second Tuesday of November. The resolution shall state the number of members from each governing board that will sit as a consolidated board of equalization. Membership of the consolidated board of equalization shall include members of school and municipal governing boards and the county commission. Membership of the consolidated board may also include members of township governing boards. All governmental responsibilities and expenses associated with equalization of property under the provisions of chapters 10-3 and 10-11 shall be shared as mutually agreed upon by the governing bodies. Governing bodies not exercising this option shall continue to hear appeals as prescribed in §§ 10-11-13 to 10-11-31, inclusive.
SDCL 10-11-66