S.C. Code Ann. § 44-7-1090

If the residents of any such school district, or portion thereof outside the city limits, desire to enter into such an agreement with the trustees of the hospital, they may petition the county legislative delegation of the county in which the district is located, setting forth the millage to be levied upon the property in the district and requesting the levy of such millage, such petition to be signed by a majority of the freeholders and also a majority of the qualified electors therein and to bear the approval of the board of trustees of the hospital.