Carcinogen found in 31 of 35 cities' water supply

http://pagingdrgupta.blogs.cnn.com/2010/12/20/carcinogen-found-in-31-of-35-cities-water-supply/?iref=NS1

Provides a greater risk of stomach cancer in humans. According to this article, bottled water is no safer than tap water and the safest out of the 3 is filtered water. You ask what are the thirty-one cities found to have carcinogen? That is better elaborated on in the following link: http://www.ewg.org/chromium6-in-tap-water/findings