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Legionella in water tanks
A house has been empty for several months and the taps not run. What is the risk of Legionella bacteria growing in the hot and cold water tanks. How/who would test it and if found how is it treated to make it safe
Expert Trade Answers
"The chances are high. What to do? is drain the cold system out. Turn the hot water on to sixty five degrees let it get to temp and then flush out the hot water system"
Answered on 9th Mar 2026 - Member since Jan 2024 -
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"You can get tester kits to check if your water has bacteria, if the hot water reset is 65° then it'll immediately kill the bacteria but we would always advise to drain the tank of any buildup
Also something to consider is your cold water tank should have a lid on top of it. It stops any dust and Debrie getting inside the tank.
You can clean these out by taking off the water emptying the tank and then just using disinfectant to clean any Build up of scale"
Also something to consider is your cold water tank should have a lid on top of it. It stops any dust and Debrie getting inside the tank.
You can clean these out by taking off the water emptying the tank and then just using disinfectant to clean any Build up of scale"
Answered on 9th Mar 2026 - Member since May 2018 -
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