S.C. Code Ann. § 50-21-105: Towing of watercraft by department.

The department may tow away and store at the nearest commercial marina or any other suitable facility any unattended watercraft, a watercraft the operator of which is ill, intoxicated, or under a disability which renders him incapable of functioning safely, or other object which constitutes a hazard to navigation and which is not within an anchorage area approved by the United States Coast Guard.

The owner may regain control of the watercraft or other object by proving ownership to the operator of the facility and paying the fee charged for storage.