About a half-dozen cars parked curbside outside El Cid were damaged by water. One patron said he found between 6 and 10 inches of water inside his car.
"I moved my car out of the flood of water, and now I'm bailing it out with a Styrofoam cup I found," said local resident Steve Silkin.
The L.A. Fire Department said there were no reports of injuries or evacuations.
The Department of Water and Power is assessing the incident, but said no buildings in the area were damaged.
"Right now, we're waiting for other underground services to come out, to find out their locations," said Steve Summers, DWP. "Once we find their locations, we're going to break the street out and go down and make repairs."
The cause of the water main break has not been determined, but Summers said it may just be maintenance.
DWP crews were on scene all morning repairing the broken water main. About 20 DWP customers were without water, but all service was restored at about 10:40 a.m.
