The incident happened in the 200 block of Lisa Drive.
The driver tells police he was returning to work in the Parkway Industrial Plaza about 1:30 p.m. He parked his car in the lot and walked away.
According to police spokesman Sgt. Paul Shavack, the vehicle began rolling across the parking lot and into the 5-foot deep pond.
The car was submerged up to its roof. No one was hurt