By The Associated Press
The U.S. Environmental Protection Agency regulates just over 90 contaminants in public drinking water systems. They include manmade chemicals as well as naturally occurring contaminants from rocks and soil. A look at some of the contaminants that fall under federal or state regulations:
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ARSENIC: Enters drinking water through eroding natural deposits in the ground or mining and other industrial activity. Studies say excessive pumping of groundwater can increase arsenic levels. Can cause skin damage, circulatory problems and increased risk of cancer.
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CHROMIUM: A metallic element used to make stainless steel, dyes, paints and wood preservatives. While the EPA regulates chromium in general, there is no separate nationwide standard for chromium-6, which became widely known after the film "Erin Brockovich." Can cause various https://drive.google.com/file/d/0Bwq31542MfibZ2JBVjVRUHE2bEE/view?usp=sharing
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