S.D. Codified Laws § 7-18A-18.1
If the validation process of a petition indicates that a sufficient number of qualified electors have signed the petition, the county auditor shall certify that the petition has been signed by the required number of qualified electors and shall place the proposed measure on the ballot pursuant to the provisions of this chapter. If the validation process of the petition indicates that an insufficient number of qualified electors have signed the petition, the county auditor shall certify that the petition has not been signed by the required number of qualified electors and may not place the proposed measure or amendment on a ballot pursuant to the provisions of this chapter. The county auditor shall, within five days of certifying, notify the petition sponsors by certified mail of the county auditor's action pursuant to this section.
SDCL 7-18A-18.1