How Polluted is U.S. Drinking Water?

MNN | How polluted is U.S. drinking water? Water supplies in the United States are safer than they used to be, but plenty of old and new dangers still lurk beneath the surface.  U.S. tap water is some of the cleanest on Earth, generally safe from the microbes and chemicals that have plagued humans' water supplies for millennia. While much of the planet relies on paltry, polluted drinking water, Americans can fill a glass without fear of cryptosporidium, chromium or chlordane. 

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