Arsenic in water
Where does it come from?
Arsenic is a natural element that often enters groundwater as a result of soil erosion. Generally, groundwater is more likely to contain high levels of inorganic arsenic than surface water.
Industrial and commercial sources
Arsenic may also get into water directly from industrial waste and indirectly from atmospheric deposits.
Quick facts about arsenic
- Arsenic occurs in different valence states, including As(III) and As(V), depending on the pH and oxidation potential of water.
- According to Health Canada, arsenic is a human cancer-causing agent.
Health Canada guidelines
- According to Health Canada, the maximum acceptable concentration (MAC) for arsenic in drinking water is 0.010 mg/L (10 µg/L).