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🤷🏽♂️
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US answer
Per regulation, potable water has to be chlorinated enough to reach from the water treatment plant to the farthest customer home.
So, think of it like a circle. A water treatment plant puts chlorine in their water to prevent harmful bacteria. The plant is located in the center town. That chlorine has to last. As the water travels from the center to the farthest end of the town, that’s how strong the chlorine has to be. So if your house is next to the plant, then you’ll have the highest chlorine concentration.
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Also, bacterias exist regardless. In water, on your face, everywhere. But those are not harmful ones.
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