S.C. Code Ann. § 37-6-408

The validity or applicability of a rule may be determined in an action for declaratory judgment in the court of common pleas for Richland County if it is alleged that the rule, or its threatened application, interferes with or impairs, or threatens to interfere with or impair, the legal rights or privileges of the plaintiff. The administrator shall be made a party to the action. A declaratory judgment may be rendered whether or not the plaintiff has requested the administrator to pass upon the validity or applicability of the rule in question.