Thames Water has confirmed that the issue is due to pumps being tripped in the Surbiton area.
Technicians are currently working to resolve the issue.
A spokesperson for Thames Water has apologised for the “disruption caused”.
A Thames Water spokesperson said: “We apologise for any inconvenience caused by the water supply disruption or low pressure you may be experiencing this morning.
“The issue is due to pumps being tripped in the Surbiton area.
“Our technician is en route to investigate and address the situation as quickly as possible.
“We’re really sorry for the disruption this has caused.”