S.C. Code Ann. § 59-71-60

Upon the receipt of the returns of the election the authorities shall by resolution declare the results thereof and may provide for the filing of a certified copy of such resolution declaring the results of the election in the office of the clerk of the court for each county wherein the operating school unit is located. In such event the results of the election, as declared by resolution of the authorities so certified and filed, shall not be open to question except by a suit or proceeding instituted within thirty days from the date of the filing thereof.