S.D. Codified Laws § 13-16-6.4
Approval to enter into an agreement or issue capital outlay certificates to which § 13-16-6.3 applies is subject to a referendum if five percent of the registered voters, based upon the total number of registered voters at the last preceding general election, petition, within twenty days thereafter, to have the question of approval or disapproval of the agreement or issue of capital outlay certificates or the lease-purchase agreement placed upon the ballot at the next regular election or at a special election called for that purpose. The business manager shall give notice of the fact that the question will be on the ballot at a regular or special election as provided by law for school elections and prepare official ballots therefor according to the provisions of this title relating to elections and the issue shall be decided by sixty percent of those voting thereon.
SDCL 13-16-6.4