Raetihi will be without water for up to six hours later this month while a new treated water line is installed between the reservoir and the township.
The new pipeline is part of upgrading and safeguarding the town's water supply. Water supply will be cut from midnight on Wednesday, November 15 through to 6am on Thursday, November 16.
Council's environmental manager Anne-Marie Westcott said that council was asking people to prepare for the water outage and take a few simple steps to help minimise any potential disruption.
"When the water is back on residents are advised to run an outside or cold laundry tap for a minute to clear any sediment that may have been stirred up in the pipe network," she said.
"People should also ensure that they have enough stored water to get them through this period.