6. Miami, FL
Contaminants detected above health guidelines: 4
An again, as we have noted earlier, one of the states with the worst tap water is Florida, but it seems that municipal water of Miami is one of the cleanest tap waters in the US. There are four chemicals that are harmful to health and exceed the permitted limits. Those are chromium, perfluorinated chemicals, radiological contaminants, and trihalomethanes.
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