Follows reports of loss of supply
UPDATE 9.10am: The issue in Onchan has been isolated and is being repaired. Estimated time until completion is around four hours.
Engineers from Manx Utilities are investigating reports of a burst water mains in Onchan and on Glen Darragh road.
Customers in both areas are being told they may experience low pressure or loss of supply as a result.
John Wannenburgh: 'Commitment, compassion and an unwavering sense of duty'
Tributes following the unexpected death of Douglas North MHK
Manx Utilities 'deeply saddened' by death of chairman
Wannenburgh praised for 'exceptional' leadership
"Tynwald will be a less colourful place without John" says president
Watterson describes Wannenburgh as 'devoted' to constituents
Douglas North MHK pays tribute to 'amazing friend'
Wannenburgh had 'biggest heart of anyone I've ever met' says Ashford