Ontario’s Conservation Authorities monitor the health of natural resources in their watersheds. This helps us to provide a better understanding of local environmental issues, focus conservation efforts where they are needed most, and track changes over time.

What is a Watershed?

A watershed is the area of land that catches rain and snow and drains or seeps into a marsh, stream, river, lake or groundwater. Watersheds are the collectors, filters, conveyers and storage compartments of our fresh water supply.

Select the image below to download an accessible PDF version of TRCA’s watershed fact sheet.

Wherever you may be in the Toronto region right now, you are in a watershed!

Search the map below to to find out which of TRCA’s watersheds you’re in.