Page 2: Guidelines for Canadian Drinking Water Quality: Guideline Technical Document – Arsenic
The maximum acceptable concentration (MAC) for arsenic in drinking water is 0.010 mg/L (10 µg/L) based on municipal- and residential-scale treatment achievability. Certified residential treatment devicesFootnote 1 are commercially available to remove arsenic to well below this concentration. Every effort should be made to maintain arsenic levels in drinking water as low as reasonably achievable (or ALARA).
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