S.C. Code Regs. § § 103-702.13
A non-recurring, non-refundable charge related to connecting the customer to the utility's system which includes the cost of installing the utility's service line from the main to the customer's premises and a portion of plant capacity which will be used to provide service to the new customer. Plant capacity shall be computed by using the Guidelines for Unit Contributory Loadings to Wastewater Treatment Facilities (1972) to determine the single family equivalency rating. Any privately-owned corporation, firm, partnership, or individual empowered by contract, or otherwise, to collect a tap fee from a customer for the provision of water service to that customer shall be considered a utility, and shall obtain commission approval prior to collecting tap fees, or any other rates for water service. An application for approval of any rate change shall not be considered unless the filing contains appropriate exhibits setting forth all cost criteria justifying the tap fee, setting forth the portion of the tap fee related to installing the service line and the portion related to plant capacity.
S.C. Code Regs. § 103-702.13