(Milwaukie, OR)  --  Milwaukie residents are being urged to boil their tap water after water-sample tests were positive for E. coli.  City officials say the samples were taken from a tank at Southeast 40th Avenue and Harvey Street, where Milwaukie and Portland water supplies connect.  Milwaukie residents are being encouraged to boil tap water for at least one minute before drinking, or use bottled water for drinking, brushing teeth, and washing dishes.  Updates on water samples are expected around noon today.