S.D. Codified Laws § 40-18-5 (2026)
Three members of the board shall constitute a quorum for the transaction of business, but the affirmative vote of three members of the board is required to adopt any motion or resolution.
Source: SDC 1939, § 40.1201 as added by SL 1943, ch 142 , § 1; SL 1949, ch 144 , § 1; SL 1951, ch 198 ; SL 1976, ch 252 , § 4; SL 1988, ch 328 , § 6.