Aiken County Coroner Tim Carlton said Master Zeyke Langford, of Ridge Spring, S.C., was swimming with a friend at Richardson Lake, Warrenville, when the incident occurred Thursday.
The friend summoned an adult after Langford went under the water while swimming and failed to resurface.
Lifeguards found the boy in approximately 13 feet of water and took him to Aiken Regional Medical Centers. He was then transferred to Medical College of Georgia Hospital, where he later died.
The death has been ruled an accidental drowning.