It seems like you would get pretty nasty germs happily living in our plumbing (especially untreated well water).
I think about the water that can sit for prolonged periods in hot water tanks, stagnant water in dead end sections of the plumbing system (unused outside faucet etc), and the wet oxygen rich environment inside the faucet ends.
Yet you almost never hear about people getting sick from their water🤷🏽♂️
In: 1670
Tap water has bacteria in it, water pipes also often have biofilms that can release bacteria. The important part is its not harmful bacteria, and its fairly dilute. Most of it probably dies when exposed to your stomach acid.
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