The simple answer to this question is yes. Boating under the influence (BUI) of alcohol or drugs is a crime in South Carolina. A rise in fatal boating accidents in recent years led to changes in both federal and state laws to make it illegal to be impaired while driving a boat.
This means that state and federal marine patrols may pull over a boat if they suspect that its driver is impaired. In some places, BUI checkpoints are conducted to let boaters know not to drive their boats drunk. Officials may also take the opportunity to inform boaters of the dangers of being impaired while driving a boat and that they may actually be arrested for it.