S.C. Code Ann. § 3-5-90

Neither this article, nor any part thereof, nor any grant or deed made under the authority hereof shall operate to divest the State of jurisdiction over any lands and all civil or criminal process issued under the authority of any laws of this State may be executed in or on any part of the lands or premises devoted to the use of the intracoastal waterway or to any use incidental thereto to the same effect as if this article had not been enacted and as if such grant or deed had not been executed.