The MCL for arsenic is 0.01 mg/L. Arsenic is highly toxic and its prevalence is due to the natural occurrence of this metal and past use of arsenic in pesticides. Arsenic poisoning typically makes people feel tired and depressed and this poisoning is also associated with weight loss, nausea, hair loss, and marked by white lines across your toenails and fingernails. For freshwater the concentration should be less than 0.01 mg/L.
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