"Due to adverse water samples, the District of Stewart advises the public that the water supply in certain areas is, or is suspected to have become contaminated and may not be safe for human consumption." said the notice.
"In order to ensure safety of the water supply, all water must be boiled rapidly for at least two minutes before being used for drinking, brushing teeth, washing food, etc. The whole community of Stewart is affected."
The advisory does not say what as caused the problem.
Earlier this week a boil water advisory was issued for parts of Penticton and the West Beach area in the Okanagan.
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