Dear Andreas, thank you for pointing out the error in the text, we have corrected it. Maximum contaminant level is 10 milligrams per liter, as set by The Safe Drinking Water Act. Thank you for critically reading  the text and informing us!

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Dear Andreas, thank you for pointing out the error in the text, we have corrected it. Maximum contaminant level is 10 milligrams per liter, as set by The Safe Drinking Water Act. Thank you for critically reading  the text and informing us!