S.C. Code Ann. § 5-7-140: Extension of police jurisdiction and authority of municipalities bordering on high tide line or high water mark of navigable body of water.

(A) The corporate limits of any municipality bordering on the high-tide line of the Atlantic Ocean are extended to include all that area lying between the high-tide line and one mile seaward of the high-tide line. These areas are subject to all the ordinances and regulations that may be applicable to the areas lying within the corporate limits of the municipality, and the municipal courts have jurisdiction to punish individuals violating the provisions of the municipal ordinances where the misdemeanor occurred in the area defined in this section.

(B) The corporate limits of any municipality bordering on the high-water mark of a navigable body of water, other than the Atlantic Ocean, are extended to include all that area lying between the high-water mark and the low-water mark. These areas are subject to all of the ordinances and regulations that may be applicable to the areas lying within the corporate limits of the municipality, and the municipal courts have jurisdiction to punish individuals violating the provisions of the municipal ordinances where the misdemeanor occurred in the areas defined in this section.