North Okanagan residents who normally get their water from the Kalamalka Lake water source are being informed that a switch is being made to the Duteau Creek source.

The regional district said the problem had been traced to a leaky valve, and that water service along Buchanan Road could be restored by 6 p.m.

"A worst-case scenario is that this logging will trigger a landslide."

The local water utility says residents should boil their water for one minute before consuming.

The Okanagan region is experiencing a dry spell. No rain has been recorded at the Kelowna weather station since June 28.

Some vulnerable users of a small north Okanagan water system should be boiling their water.

Testing shows the Duteau Creek water supply has returned to a "good" rating.

The Regional District of North Okanagan will be reviewing the boil water notice on Friday.

That may mean weighing flood protection against the need to store enough water.

Greater Vernon Water (GVW) customers have been switched to the Duteau Water Treatment Plant (DCWTP) due to electrical issues with the Mission Hill Water Treatment Plant/Kalamalka Lake water source, according to the Regional District of North Okanagan (RDNO).