Wash. Rev. Code § 87.80.110
In the month of March, or another time as determined by the board of joint control, in each year the members of the board of joint control shall meet and organize as a board for the ensuing year and shall select a chair from their number and appoint a secretary who may, but need not, be a member of the board, and who shall keep a record of their proceedings, and perform other duties as the board prescribes. Business of the board shall be transacted at meetings thereof and a majority of the qualified membership of the board constitutes a quorum for the transaction of business and in all matters requiring action by the board there shall be a concurrence of at least a majority of the members present. However, if an alternative voting structure was proposed in the petition and adopted in the board of county commissioners' resolution, this structure will govern the voting procedures of the board of joint control. All meetings of the board shall be public.
RCW 87.80.110