Tap water in all U.S. cities is better tested and regulated for purity than bottled water, according to the Natural Resources Defense Council (NRDC). But your tap water’s quality still depends on how well your watershed and aquifers are protected, how effectively water is treated to remove pollutants, and the condition of the pipes that bring it to your home. In a 2003 report on drinking water in 19 large U.S. cities, the NRDC concluded that only Chicago rated “excellent” for water quality; five cities rated “good,” eight were “fair” and five, “poor.”
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