S.D. Codified Laws § 11-7-11
A commission shall consist of five commissioners, who, unless otherwise provided by ordinance, shall be residents of the area of operation of the commission, appointed after the resolution provided for in § 11-7-7 becomes finally effective. In municipalities of the first class, no public officer or employee of the municipality may serve as a commissioner. However, if the municipality employs a city manager, the governing body may, by resolution, constitute itself as the commission. In municipalities of the second and third class and in counties, the commission may be made up of members of the governing body, but may not include employees of the municipality or county. However, in municipalities of the second and third class and in counties, a majority of the commission may not be comprised of the governing body. A commissioner may be a notary public.
SDCL 11-7-11