Originally Posted by
ianfly
A quick google search of “plane tap water” should tell you why you should avoid drinking any water from plane tanks - they’re hardly ever cleaned and full of bacteria.
The internet isn't always right!
The water is tested by the local water company regularly, at each part of its journey (taps on the plane, in the tanks and from the water bowsers). The tanks and pipes are also regularly sterilised.
During service, is the big water bottle the crew are dispensing water from has had its label removed, then it has been refilled with the on-board water.