11. St. Louis, MO
Contaminants detected above health guidelines: 6
The utility of St. Louis City delivers tap water to around 319,000 consumers. Of harmful chemicals that are in the tap water of St. Louis, six exceed prescribed limits: bromidichloromethane, chloroform, chromium, dichloroacetic acid, trihalomethanes and trichloroacetic acid.
![15 Cities with the Cleanest Tap Water in the US in 2017](https://imonkey-blog.imgix.net/blog/wp-content/uploads/2017/11/22162421/st-louis-996718_1920-750x563.jpg?auto=fortmat&fit=clip&expires=1753401600&width=480&height=360)
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