S.C. Code Ann. § 6-24-240

At the close of each fiscal year, a joint agency shall submit an annual report of its activities for the preceding year to each member, including a complete operating and financial statement covering the operations of the joint agency during the year. The joint agency shall cause an audit of its books of record and accounts to be made at least once a year by a certified public accountant, and the cost of the audit may be treated as a part of the cost of construction of a project or otherwise as part of the expense of administration of a project covered by the audit.