S.C. Code Ann. § 27-29-190 – Service of process

(a) In addition to the methods of service provided for in the rules of civil practice service may be made by delivering a copy of the process to the office of the commission, but it is not effective unless the plaintiff (which may be the commission in a proceeding instituted by it):
1. (1) forthwith sends a copy of the process and of the pleading by certified or registered mail to the defendant or respondent at his last known address, and
2. (2) the plaintiff's affidavit of compliance with this section if filed in the case on or before the return day of the process, if any, or within such further time as the court allows.
(b) If any person, including any nonresident of this State, engages in conduct prohibited by this chapter or any rule or order hereunder, and has not filed a consent to service of process and personal jurisdiction over him cannot otherwise be obtained in this State, that conduct authorizes the commission to receive service of process in any noncriminal proceeding against him or his successor which grows out of that conduct and which is brought under this chapter or any rule or order hereunder, with the same force and validity as if served on him personally. Notice shall be given as provided in subsection (a).