S.C. Code Ann. § 5-21-320

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