S.C. Code Ann. § 44-7-1820

The corporate powers and duties of the district shall be exercised and performed by a board of directors (hereinafter called the board) to be composed of four members from Florence County, three members from Darlington County, two members each from Chesterfield, Dillon, Marion and Marlboro Counties appointed by the Governor upon recommendation of the legislative delegations of the respective counties, including resident Senators if any.