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Helmut Seisenberger / Thinkstock

By Robert Coleman

In 2016, an EWG report found that chromium-6—a cancer-causing compound made notorious by the film "Erin Brockovich"—contaminated the tap water supplies of 218 million Americans in all 50 states. But our just-released Tap Water Database shows the problem is even worse than that.

Based on test results obtained directly from almost 50,000 local water utilities, drinking water supplies for about 250 million Americans are contaminated with chromium-6. For about 231 million people, drinking water supplies have average levels of chromium-6 exceeding the one-in-a-million cancer risk level determined by California state scientists.

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