<http://schema.org/alternativeHeadline>
"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."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/translating-uncle-sam/stories/how-polluted-is-us-drinking-water?page=1&hpt=Sbin>