Unionville Special Policy Area Boundary Review


The City of Markham is updating the boundary of the Unionville Special Policy Area.

In 2019, the Toronto and Region Conservation Authority (TRCA) prepared updated floodplain mapping in the Unionville community. The updated mapping incorporates changes to vegetation, pervious surfaces, land use, topography and culvert/bridge crossings since the last floodplain study in 2003.

Provincial and municipal planning policy directs new development away from flood hazards to protect public health and safety.  Special Policy Areas are areas that have historically existed within the floodplain and where site-specific policies approved by the Province provide for the continued viability of existing uses. In Markham, a Special Policy Area was established in 1990 within the Unionville community to provide for certain development permissions within the floodplain. Section 3.4 of the Markham Official Plan provides policies to manage flood-related risks within the floodplain and Special Policy Area

Study Area Map

Study Process

  1. Study Initiation – Preliminary Report to Development Services Committee (completed)
  2. Virtual Community Information Meeting – City and TRCA staff will host an online meeting to inform the public of the new floodplain boundary and the Special Policy Area review process (September 17, 2020 7:00 p.m. to 8:30 p.m. Registration is mandatory. Please contact Crystal Thorne at cthorne@markham.ca.)
  3. Analysis and Review – Staff will prepare draft Official Plan and Zoning By-law Amendments
  4. Public Meeting – Receive public input into the draft amendments
  5. Staff Recommendation – Recommendation report to Development Services Committee including the recommended Official Plan and Zoning By-law Amendments
  6. Council Decision – Council will adopt, modify or deny the Official Plan and Zoning By-law Amendments
  7. Approval – York Region, in consultation with the Province of Ontario will review and render a decision on the Official Plan Amendment. The City of Markham is the approval authority for the Zoning By-law Amendment

How can I learn more?

Visit the City's online engagement site at www.yourvoicemarkham.ca/unionvillespecialpolicyarea to learn more or to stay informed about this project.


May 24, 2019 – Report to TRCA Board of Directors: Unionville SPA 2D Modelling and Floodplain Mapping Update

October 28, 2019 – Report to Development Services Committee to initiate the SPA process


Patrick Wong

Senior Planner, Natural Heritage

E-mail: patrickwong@markham.ca

Phone: 905.477.7000 extension 6922

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