- Drinking water can be an important source of contaminants, including lead and arsenic.
- Contaminants can enter water as a result of human activities, (e.g. when pollutants are discharged from a factory) or as a result of natural processes (e.g. when chemicals, like arsenic, which are found naturally in rock leach into ground or surface water).
- Humans are exposed to arsenic primarily through food and drinking water.
- Long-term, low-level exposure to arsenic is associated with cognitive deficits, preterm birth, cardiovascular disease, and cancer.
- Arsenic exposure in drinking water occurs around the world, and high concentrations of arsenic in drinking water supplies have been found in a number of Canadian communities.