Fact #1 -- Water leaving a water treatment facility will (usually) contain no harmful impurities... but after travelling through miles of pipe and the plumbing in your home, it had plenty of time to pick up contaminants along the way.
Fact #2 -- Heavy rains, periods of drought, unusually high demands on the aquifer, and a host of other things can radically affect the quality of water pulled from a well.
So whether you have city water or get your drinking water from a well, you have plenty of good reason to test the quality of your water on a regular basis.
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