S.D. Codified Laws § 6-16-6
Any person who is registered to vote and resides in the proposed district may vote in the elections provided for in § 6-16-5. However, the qualifications of a voter for irrigation district elections are as provided in chapter 46A-4, the qualifications of a voter for water project district elections are as provided in §§ 46A-18-2.1 and 46A-18-2.2, the qualifications of a voter for watershed district elections are as provided in § 46A-14-15.1, and the qualifications of a voter for road district elections are as provided in § 31-12A-1.2. Absentee voting is allowed pursuant to chapter 12-19 for the election on the question of formation of the special district or any other question to be voted on by the eligible voters of the district. For the purpose of this section, a person resides in a proposed district if the person actually lives in the proposed district for at least thirty days in the last year.
SDCL 6-16-6