Surely the many miles of underground pipes are a breeding ground for microbes, right?
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The water is never sitting still.
Ice maker kicks on, water flow. Flush a toilet, water flow. Run Dishwasher, water flow. Brushed teeth, you get the idea. All this comes into your home on a 3/4 to 1 inch piece of copper. And everyone else is doing the same thing, not to mention all the leaks. The water in pipes never stops long enough to grow anything.
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