Passengers at both terminals of Gatwick Airport are being affected by a water supply issue, with toilets reported to be out of order and restaurants closed.
In a statement on X, the airport in West Sussex apologised for the disruption, external and said a problem in the Horley area was affecting supplies and was under investigation.
Bottled water is being made available to passengers and staff and contingency measures have also been put in place, it said.
SES Water, which covers parts of Kent, Surrey and south London, as well as the airport, has said its service is resuming after an earlier power outage at its treatment works.
It said complications caused by a power outage at its Bough Beech water treatment works meant some customers had experienced low water pressure or a temporary loss of supply.
A spokesperson had earlier confirmed that Gatwick Airport was affected.
In an update just before 13:45 BST, they said: “Our Bough Beech water treatment works are back up and running.
“We now need to treat the water before returning services to normal as quickly as we possibly can.”
Gatwick said the supply issue was continuing to cause disruption on Sunday afternoon.
In a statement, it said: “There is currently no water supply in either terminal.
“Our staff are on hand to support passengers and provide assistance where needed, some restaurant partners have opened to provide additional seating.”
The airport said it was working closely with the water company to restore supplies as quickly as possible.