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I believe in normal circumstances its neglegible and not worth worrying about.

This response seems silly. Do you not take shower or baths in tap water? The issue is the same.

I think you are probably shower and bathe in water that flows through pipes, so it seems absurd to be concerned about the same water/pipe combination used elsewhere.

If you don't shower or bathe or use modern plumbing infrastructure then please, by all means correct my mistaken assumption.