In part one of a two-part series Miles O’Brien travels to Hinkley, Calif., the town featured in the movie Erin Brockovich, for its multi-million battle over contaminated groundwater. O'Brien reports on the investigation into the chemical Chromium-6, the agency that…

On tonight's NewsHour, Miles O'Brien reports on the decline of Hinkley, Calif., the town featured in the movie Erin Brockovich. Here's the not-so-Hollywood version of what really happened in Hinkley and beyond.

By Miles O'Brien

In September 2010, scientists at the Environmental Protection Agency came to a startling conclusion: Even a small amount of a chemical compound commonly found in tap water may cause cancer. More than 70 million Americans drink traces of chromium every…

By Travis Daub