Surely the many miles of underground pipes are a breeding ground for microbes, right?
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On top of the other answers, many municipalities do “directional flushing.” Usually in the spring they’ll work their way down the line and just let a bunch of water out the hydrants along the way. It’s purpose is to push any sediments along the line and flush them into the sewer. Clean lines give less places for bacteria to take hold, if any bacteria survived the treatment process.
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