MSNBC Published January 8, 2002 Millions of Americans have been drinking tap water contaminated with potentially harmful byproducts of chlorine - and often at levels in excess of what studies show to be safe for pregnant women, two environmental groups say in a new report. Chlorine is commonly used to disinfect drinking water. When it is added to water that contains organic matter such as runoff from farms or lawns, however, it can form compounds such as chloroform that can cause illness.
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