Study finds large amounts of probable carcinogen in US water supply

Major cities include Tallahassee, Miami, Las Vegas, Phoenix, Los Angeles, Washington, DC, and Pittsburgh

A recent study of the drinking water in 35 US cities found alarming levels of hexavalent chromium, a probable cancer-causing carcinogen.

Hexavalent chromium was the chemical at the center of events depicted in the film "Erin Brockovich."

The first nationwide analysis measuring the presence of chromium, carried out by the nonprofit Environmental Working Group, was made public on Monday.

Norman, Oklahoma had by far the highest measure at 12.9 parts per billion. Honolulu, Hawaii, Riverside, California and Madison, Wisconsin were other cities with high levels.

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