A damaged water main has been identified as the cause of residents in the Gungahlin area confronted by yellow water when turning on taps on Tuesday.
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Icon Water investigated reports of water discolouration in Casey, Ngunnawal and Moncrieff.
Crews located a damaged water main as a result of development works for the new suburb Taylor, which is now isolated.
Acting general manager asset management, Cameron Patrick said they were still receiving discolouration calls from customers in Moncrieff, but it seems that Casey and Ngunnawal is already clearing.
"Our crews are working hard to resolve the water discolouration as soon as possible. Customers may see cloudy aerated water while we restore the network, and water should start to clear with normal use," he said.
"In the meantime, please avoid drinking the water if it looks or smells objectionable or using water for washing dishes or clothes to avoid stains."
Moncrieff resident, Mani Venugopal told Fairfax Media the water smelt like sewerage when he tried to wash his hands on Tuesday.
"I turned on the tap and all the water was yellow."
Mr Venugopal said his son noticed the discolouration at about midday on Tuesday. When he arrived home from work just before 7pm the water was still yellow.
He said his wife left the tap running and the water has slowly returned to normal.
According to information on the Icon Water website, a change in water colour normally occurs when the natural sediment is disturbed within the pipes, causing the water to take on a brown or redish colour.
Icon Water apologised to customers in the affected area for any inconvenience.