Yarra Valley Water, in consultation with the health department, issued the warning for Kallista, Sherbrooke and The Patch in the Dandenong Ranges. Authorities said last week’s deadly storms that swept across the state had an equipment failure at the drinking water tank. “This may result in potentially unsafe water entering the drinking water system and customer taps,” Yarra Valley Water said. “Boiling water will not remove any potential contaminants,” Yarra Valley Water said. Emergency drinking water is available at The Patch Hall, 5 The Patch Rd, The Patch, and Kallista Public Hall, 6 Tom Roberts Rd, Kallista.