Naturally Occurring Arsenic in Central Oklahoma Aquifer

 In 2000, the U.S. Environmental Protection Agency (EPA) reviewed the arsenic drinking water standard for public water supplies. Considering the available research and statistics on the health effects of arsenic ingestion, the EPA reduced the Maximum Contaminant Level (MCL) for public drinking water from 50 micrograms per liter (μg/L) to 10 μg/L (U.S. Environmental Protection Agency, 2001a)…

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