The maximum level of arsenic permitted in drinking water by the U.S.Environmental Protection Agency is

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The maximum level of arsenic permitted in drinking water by the U.S. Environmental Protection Agency is 0.010 parts per million (ppm) or 10 micrograms per liter (µg/L). This standard is based on health considerations and balances the potential adverse health effects of long-term exposure to arsenic with the costs and feasibility of removing it from drinking water sources.

The Maximum Level of Arsenic Permitted in Drinking Water by the U.S.Environmental