"Source water" refers to the lakes, rivers and aquifers from which we get the water we drink.
Ontario protects our source water through the Clean Water Act which:
“Helps protect drinking water at the source, as part of an overall commitment to safeguard human health and the environment.Requires local Source Protection Committees assess existing and potential threats to their water, and that they set out and implement the actions needed to reduce or eliminate these threats. “
More than two million Ontario residents get their drinking water directly from surface or groundwater sources and do not have access to water treatment systems. By protecting water at the source we ensure these people have a safe and healthy source of drinking water. (Drinking Water Source Protection Act for Clean Water, Frequently Asked Questions).