The Environmental Working Group released a report Monday indicating that millions of Americans are regularly drinking hexavalent chromium, made famous in the film "Erin Brockovich" as a carcinogen, through their tap water.
The group -- whose study was first reported in a story Sunday by the Washington Post's Lyndsey Layton -- tested water from 35 U.S. cities and found that samples from 31 cities contained hexavalent chromium. The highest concentrations were found in Norman, Okla.; Honolulu; and Riverside, Calif. The substance had been a widely used industrial chemical for decades and has evidently leached into the groundwater in many areas.
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[List: America's most polluted cities]
The list of cities found to have hexavalent chromium in the municipal water supplies
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