S.C. Code Ann. § 6-11-20: Petition for formation of district.

Before any such district is formed there shall be filed with the clerk of the court of the county in which such district is proposed to be located a written petition signed by a majority of the resident landowners in the proposed district or by the owners of more than half the land and acreage which will be affected by or assessed for the expense of the proposed improvements, as shown by the tax assessment rolls. The petition shall be accompanied by a plat showing the limits of the proposed district. When such proposed district is situated in two or more counties such petition shall be filed with the clerk of the court of each county wherein the district is to be located.