Murray Bridge's water supply has been restored.
SA Water turned on the mains line supplying the city around 4.40am on Saturday after crews spent almost eight hours repairing a break in the pipe.
The utility thanked residents and business owners for their patience.
"The road around the repair site is still being reinstated, so please take care if you need to travel on Adelaide Road today and observe any traffic management measures in place for the safety of crews and other road users," it said.
Murray Bridge residents are being advised to stock up on water before SA Water cuts off the city's supply to fix a broken pipe.
Crews would be forced to turn off Murray Bridge's tap water at 9pm on Friday to repair a break in the main pipe supplying the city, the utility warned just after 6pm.
Residents were likely to be without water through the night, SA Water said in a statement.
Bottled water would be available at the State Emergency Service station on Thomas Street.
It advised anyone in Murray Bridge to fill up jugs with water for drinking overnight, and buckets for washing.
Refraining from brushing teeth or flushing toilets would also help, it said, and it would be a good idea not to use dishwashers or washing machines until tomorrow.
Anyone with concerns or questions should contact SA Water on 1300 SA WATER (1300 729 283).