WASHINGTON, DC, December 23, 2010 (ENS) – Tap water from 31 of 35 U.S. cities tested contains hexavalent chromium, or chromium-6, according to laboratory tests commissioned by the nonprofit Environmental Working Group and revealed in a report Saturday. The highest levels were detected in Norman, Oklahoma; Honolulu, Hawaii; and Riverside, California.

The cancer-causing chemical is best known to the general public from the 2000 movie “Erin Brockovich,” starring Julia Roberts.

The film dramatized the plight of the cancer-stricken residents of Hinkley, California, who in 1996 won a $333 million settlement from Pacific Gas and Electric Co. for contaminating their tap water with hexavalent chromium.

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