About 50 people were without water in Vista early Friday after an 8-inch water main pipe broke.
City water crews were repairing the break at the intersection of Mar Vista Drive and Phillips Street.
Water also flooded streets from northbound Mar Vista Drive, over the railroad tracks, to South Santa Fe.
Roads in the area are blocked off, as crews repair the damage.
The damage caused a sink hole to open up.
Service to customers was restored at around 9 a.m.
The cause is unknown.