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Scientists recently found a harmful chemical called "chromium-6" in the tap water of 31 US cities. That's the same chemical that made Erin Brockvich famous, when she sued on behalf of people who got sick from the polluted groundwater. But now chromium-6 has broken out of its containment barrier, and scientists say it's popping up elsewhere - including our neighbor state, California. So what's in our drinking water? Does it have chromium? How do we filter it out? What's the best way to have clean drinking water? We ask the experts.

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