"While most of these additives are benign, and sometimes even provide a small health benefit or a welcome flavor and effervescence, some are not so good.

Nitrates, a composite of nitrogen and oxygen that can make people ill when consumed in large quantities, have been detected in the aquifer at levels exceeding state standards. The compound is believed to have infiltrated from leaky sewage pipes and fertilizers."

http://www.sfgate.com/bayarea/article/SF-s-pure-drinking-water-to-get-a-new-ingredient-10949336.php

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