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Thousands of Americans drink tap water poisoned by unsafe levels of a cancer-causing heavy metal, and government authorities are doing little to stop it, according to a new report from clean water activists.
The chemical hexavalent chromium, also known as chromium-6, gained notoriety as the carcinogenic water contaminant that Erin Brockovich sued a utility over in California—and the new report from advocacy organization Environmental Working Group finds that it shows up in the water systems of major cities all over the country.
The data estimate that water supplies serving 218 million Americans—more than two-thirds of the population—contain more chromium-6 than California scientists have deemed safe. The group estimated that if nothing changes, chromium-6 in tap water will lead to more than 12,000 excess cases of cancer by the end of the century.
The findings are one more sign of a broken state and federal regulatory system that enabled crises in Flint, Michigan, and Hoosick Falls, New York, among other cities where dangerous contaminants in tap water threatened public health, advocates say.
"This is a repeating story of the lack of regulatory oversight and scientific updates to ensure clean drinking water," Bill Walker, a coauthor of the report, told TakePart. "A basic aspect of public health is being able to drink the tap water. We have not achieved that in the U.S."

There are substantial human and toxicological studies (in mice and other lab animals) that suggest that exposure to these endocrine-disrupting chemicals, many of which are increasing in use, are contributing to female reproductive conditions," said Dr. Leonardo Trasande, associate professor of pediatrics at New York University School of Medicine.
Comment: For more clues, listen to The Health & Wellness Show: Seeing the Light with Dr. Alexander Wunsch