15. Philadelphia, PA
Contaminants detected above health guidelines: 7
Philadelphia Water department supplies around 1,600,000 consumers with tap water. Tap water of Philadelphia has seven harmful chemicals that exceed the prescribed limits. Those chemicals are bromidichloromethane, chlorate, chloroform, chromium, dibromochloromethane, trihalomethanes and hormones.
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The following 4 cities on our list of cities with the cleanest tap water in the US in 2017 share the 11th place.
