The EPA considers it unacceptable for arsenic to be above .01 parts per million. The World Health Organization notices increased risks of lung and bladder cancer at concentrations of .05 milligrams per liter of water. The WHO considers .05 mg/l the safe limit for water.
For over fifty years, the standard in the US was 50 parts per billion; recently, the EPA lowered that to 10 parts per billion. This means that in every billion molecules of water, there can be up to ten molecules of arsenic; an EPA pamphlet likens it to “a few drops of ink in an Olympic-sized swimming pool.”
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