The national distribution of perchlorate and arsenic in groundwater is currently poorly understood in Canada. Spatial analysis with science-based tools is needed to better understand their potential impacts and identify information gaps.
The risk to human health from exposure to perchlorate is primarily related to thyroid function. The health effects related to arsenic are better known and include various forms of cancer and other adverse heath effects.
This map provides groundwater quality data for perchlorate and arsenic on a national scale. The data have been collected and compiled by Environment Canada through ad hoc and formal arrangements with various levels of government.
