The Coast Guard said at about 6:12 p.m., a response boat crew encountered the man while on patrol.
Crews used a hand pump to help drain the boat and tow him to safety, authorities said.
"Even if your boat has automatic pumps installed, we recommend carrying a manual pump on board for situations like these," the Coast Guard said in a news release. "We urge boaters to carry a damage control kit consisting of plugs, tape, and other materials to patch holes and slow flooding in case of an emergency."