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Is the water from the tap/faucet in an area hard or soft or safe to drink etc?

32 votes
2 answers
8k views

What makes the tap water on board airplanes unsafe to drink?

Every single airplane toilet I've ever been to had the following (or similar) sign: Why is drinking the tap water prohibited? And if drinking the water is prohibited, why is it acceptable to brush …
JonathanReez's user avatar
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