S.C. Code Ann. § 49-19-1230

In case the sum received for such assessment exceeds the total cost of items for which it has been levied the surplus shall be placed in the general fund of the district and used to pay costs of construction. But if the incorporation of the district be dissolved, as provided elsewhere in this chapter, the amount of surplus, if there be any, shall be prorated and refunded to the landowners paying such assessments.