S.C. Code § 6-7-130
Each county and municipality executing the agreement creating the regional council of government must be a member. Representation of members on the policymaking body of the regional council of government must be as prescribed in the agreement creating the council of governments. The agreement shall specify the procedure for the appointment of representatives of the member local governments; provided, however, at least a majority of the members of the policymaking body must be members of the governing bodies of the participating cities and counties. Provided, further, that a resident member of the General Assembly may be appointed by their respective resident county legislative delegation from each county comprising the council with these members serving ex officio. If a county has no resident member of the General Assembly, then the county council shall select a member of the General Assembly who represents some or all of the county in question to serve ex officio, but no member is required to serve pursuant to such selection. The representatives of the members serving on the policymaking body shall serve without salary for a term of four years; however, these representatives may be reimbursed for expenses incurred in the performance of their duties. The regional council of government shall adopt bylaws designating the officers and their method of selection and providing for the conduct of its business.
S.C. Code § 6-7-130