S.C. Code Ann. § 1-17-10

The Commission on Interstate Cooperation shall be composed of fifteen members, namely: The five members of the Committee on Interstate Cooperation of the Senate, the five members of the Committee on Interstate Cooperation of the House of Representatives and five officials of the State government named by the Governor, one of whom shall be designated by him as the chairman of the Commission. The State officials, when so named, shall serve ex officio. The Governor shall be an honorary member of the Commission.