The N.W.T.'s chief public health officer has issued a precautionary boil water advisory for the community of Délı̨nę. The measure is being taken because water in the community has more mud in it than usual, the Department of Health and Social Services said in the notice Friday afternoon. Residents are being urged to boil water used for drinking, preparing food, and dental hygiene for at least one minute. The department said boiling water is especially important while preparing infant formulas.