S.D. Codified Laws § 38-7-9
Quorum of commission
A majority of the State Conservation Commission shall constitute a quorum, and the concurrence of a majority in any matter within their duties shall be required for its determination.
Source: SL 1937, ch 19, § 4; SDC 1939, § 4.1504; SL 1963, ch 6; SL 1968, ch 1, § 3.