Dr. Andrew Weil M.D.

The latest study of bottled water came from the Environmental Working Group (EWG), a Washington-based nonprofit organization that investigates pollutants and their impact on public health. The EWG report isn't the first or the most comprehensive on the subject of bottled water. In 1999, the National Resources Defense Council, a New York-based environmental advocacy group, tested more than 1,000 bottles of 103 brands of bottled water and found that about one-third violated state standards or microbial impurity guidelines. The following year, a Consumer Reports investigation concluded that eight of 10 five-gallon polycarbonate jugs tested contained residues of bisphenol A, an endocrine disrupter.
The EWG report, issued in October 2008, documented a surprising array of chemical contaminants in every bottled water brand analyzed. The contaminants included toxic byproducts of chlorination in the store brands of several large retail chains, at levels the same as those routinely found in tap water. The EWG said that it considered the results to "represent a snapshot of the market during the window of time" in which the samples were purchased.
Cancer-causing contaminants in bottled water tested "substantially exceeded the voluntary standards established by the bottled water industry," the EWG reported. The lab tests were conducted at the University of Iowa Hygienic Laboratory on 10 brands of bottled water purchased at retail outlets in nine states and the District of Columbia.
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The contaminants included disinfection byproducts, common urban wastewater pollutants such as caffeine and pharmaceuticals; heavy metals and minerals including arsenic and radioactive isotopes; fertilizer residue (nitrate and ammonia); and a broad range of others, tentatively identified industrial chemicals used as solvents, plasticizers, viscosity decreasing agents, and propellants.