S.C. Code Ann. § 40-2-255
(B) The application for renewal of a registration shall include:
(C) As a condition of renewal of registration, an applicant who engages in attest or compilation services, or both, must provide evidence of satisfactory completion of peer review no more frequently than once every three years. Peer review must be conducted in a manner as the board specifies by regulation. This review must include a verification that individuals in the firm, who are responsible for supervising attest or compilation services, or both, and who sign or authorize someone to sign the accountant's report on the financial statements on behalf of the firm, meet the competency requirements set out in the professional standards for these services and these regulations must: