S.D. Codified Laws § 9-41A-6
Except as otherwise provided in the agency agreement or the bylaws, the duly authorized representatives of each member first or second class municipality shall act as, and vote on behalf of, the municipality. An alternate representative may be appointed by a member municipality and, in the absence of the representative, may act as, and vote on behalf of, the municipality except where the agency agreement or bylaws provide otherwise, representatives of the member municipalities shall hold at least one meeting each year for the election of directors and for the transaction of any other business. Unless the agency agreement or bylaws prescribe otherwise, special meetings of the representatives may be called for any purpose upon written request to the president or secretary to call the meeting. The officer shall give notice of the meeting to be held between three and sixty days after receipt of the request. Unless the agency agreement or bylaws provide for a different percentage, a quorum for a meeting of the representatives of the member municipalities is a majority of the total representatives.
SDCL 9-41A-6