S.C. Code Ann. § 9-3-320

The State agent shall have the authority to promulgate rules and regulations under which the State agency may make a reasonable charge or assessment against any political subdivision whose employees shall be included in any coverage agreement under any plan of coverage of employees as provided by the provisions of this chapter. Such charge or assessment shall be determined by the State agent and shall be apportioned among the various political subdivisions of government in a rateable or fair manner, and the funds derived from such charge or assessment shall be used exclusively by the State agency to defray the cost and expense of administering the provisions of this chapter. Such amount shall be assessed against each such political subdivision as is necessary to pay its share of the expense of providing supplies, necessary employees and clerks, records and other proper expenses necessary for the administration of this chapter by the State agency.