A previous answer in the link.
Arsenic is ubiquitous, it’s a natural element found in the Earth’s crust, and is used in countless human activities including manufacturing (wood preservatives, paint, soaps), industry (mining and coal burning), and agriculture (pesticides), mining, or coal burning. Therefore, arsenic can leach into water from nearby soil or from human pollution. Ground water tends to have higher levels than lake or river-derived water sources. Water can be treated or filtered for arsenic, but bottled water is not necessarily any safer. The FDA does have rules established about the maximum allowable amount of arsenic in bottled water, but those rules do not apply to water bottled and sold in the same state, which accounts for 2/3 of bottled water in the United States.
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