About TRCA


With more than 60 years of experience, Toronto and Region Conservation Authority (TRCA) is one of 36 Conservation Authorities in Ontario, created to safeguard and enhance the health and well-being of watershed communities through the protection and restoration of the natural environment and the ecological services the environment provides.

TRCA’s vast jurisdiction comprises the following nine watersheds, plus their collective Lake Ontario waterfront shorelines:

  • Carruthers Creek
  • Don River
  • Duffins Creek
  • Etobicoke Creek
  • Highland Creek

  • Humber River
  • Mimico Creek
  • Petticoat Creek
  • Rouge River

More than 3.5 million people live within TRCA-managed watersheds, and many others work in and visit destinations across our jurisdiction. The population within TRCA’s jurisdiction is expected to grow significantly in the years to come.

These watersheds span six upper-tier and 15 lower-tier municipalities. Some of Canada’s largest and fastest growing municipalities, including Toronto, Markham and Vaughan, are located entirely within the TRCA watershed jurisdiction (see table below).

Upper-Tier Municipality Lower-Tier Municipality % of Population Within TRCA Jurisdiction
Dufferin County Mono (Town) 5
Durham Region Ajax (Town) 86
Durham Region Pickering (City) 95
Durham Region Uxbridge (Township) 19
Peel Region Brampton (City) 63
Peel Region Caledon (Town) 55
Peel Region Mississauga (City) 33
Simcoe County Adjala-Tosorontio (Township) 4
Toronto Toronto (City) 100
York Region Aurora (Town) 4
York Region King (Township) 45
York Region Markham (City) 100
York Region Richmond Hill (Town) 99
York Region Vaughan (City) 100
York Region Whitchurch-Stouffville (Town) 43

TRCA will continue the vital work of protecting the integrity and health of the rivers and creeks in the jurisdiction, developing a system of green and natural spaces that sustains local ecosystems, and advancing sustainable practices that will improve people’s lives within our growing region.

The context for TRCA’s work is complex and continuously evolving, making it important to adapt the organization’s strategic direction so that it remains relevant and linked to those of our partners.


The quality of life on Earth is being created in rapidly expanding city regions. Our vision is for a new kind of community — The Living City — where human settlement can flourish forever as part of nature’s beauty and diversity.


To protect, conserve and restore natural resources and develop resilient communities through education, the application of science, community engagement, service excellence and collaboration with our partners.


We are honest, ethical, and professional.

We achieve shared goals through a solution-oriented approach.

We are responsible for our actions, behaviours and results.

We are equitable, fair and respectful while recognizing individual contributions and diversity.

We maintain a high standard of performance and customer service, consistently striving to improve and produce quality work.


TRCA jurisdiction map
Map of the nine watersheds in TRCA’s jurisdiction.