What's in your water? A survey by the Environmental Working Group released on Tuesday found 141 unregulated chemicals and an additional 119 for which the Environmental Protection Agency has set health-based limits. Most common among the chemicals found were disinfection byproducts, nitrates, chloroform, barium, arsenic and copper. The research-and-advocacy organization compiled findings from the states that agreed to provide data they collected from 1998 to 2003. That data comes from nearly 40,000 water utilities, serving 231 million people. The utilities were required by federal law to report that data to consumers.
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Public Data Show Chemicals in Tap Water