Thousand of properties could be without water in south-west and west London after a problem with a pump.
Thames Water has apologised to its customers in the TW and W postcod areas affected by the water outage.
Thames Water said the fault was because of an issue with one of its pumps at Hampton.
The company has said its engineers have managed to restart the pumps and people would “slowly” start to regain water pressure.
Residents have taken to Twitter to express dismay at the water problems.
