When Erin Brockovich went after PG&E for poisoning groundwater in the desert town of Hinkley -- a campaign that later became a film starring Julia Roberts -- the toxic chemical was a heavy metal called hexavalent chromium. Also known as chromium 6, it's listed as causing cancer, developmental harm and reproductive harm in both men and women. A new report finds Hinkley isn't the only California city with chromium 6 contamination.
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