S.C. Code Ann. § 40-23-230
(B) A license issued under this chapter is renewable:
(C) The department may reinstate the license of a licensee who allows his license to lapse by failing to renew the license as provided in this section if the licensee:
(E) As of the effective date of this chapter, a person who possesses a current well driller license from the board is eligible to receive a:
(1) Class A well driller license if the licensee:
(2) Class B well driller license in one or more of the well drilling categories if the licensee: