S.D. Codified Laws § 46A-3B-5
If three or more nominating petitions are filed for a director office, the secretary of state shall certify the nomination of director candidates to the respective county auditors and the water development district office. The water development district office shall furnish nonpolitical sample and official ballots in adequate numbers and time to permit distribution of such ballots by the respective county auditors with other primary election ballots. Following a primary election, the names of the two candidates receiving the most votes cast in the primary election (or if only two nominating petitions are filed, the names of the two candidates) shall be certified and ballots furnished in the same manner as for the primary, but in time to permit distribution of the ballots by the respective county auditors with other general election ballots. If only one nominating petition is filed for a director office, no election may be held and a certificate of election shall be issued to the nominee in the same manner as to a successful candidate after election. In the case of an initial election, no primary election may be held and the Board of Water and Natural Resources shall certify the names of the candidates and furnish ballots in time to permit distribution of the ballots by the county auditors prior to the general or special election.
SDCL 46A-3B-5