Here, some 70% of the surface water and 60% of the drinking water contains hexavalent chromium, a powerful, cancer-causing carcinogen, at more than double national and international standards.

FORBES: The World's Most Polluted Places

Other solutions are more complex, but still cheap, such as injecting a sugary mixture into a water supply contaminated by hexavalent chromium to make it less toxic and less mobile underground.

FORBES: The World's Most Polluted Places

C. was among localities with contaminated water -- hexavalent chromium.

WHITEHOUSE: Press Briefing