Is Mold / Infestations Legal in Ontario

Maintenance & Repairs Ontario 3 min read · published March 09, 2026 Flag of Ontario

Mold and infestations in rental homes are not just nuisances—they can pose serious health risks and legal challenges. Understanding the legal framework in Ontario regarding these issues can help tenants ensure safe and habitable living conditions.

Mold in Ontario Rentals

Mold in rental housing can impact both the health of tenants and the condition of the property. In Ontario, the Residential Tenancies Act, 2006 mandates that landlords maintain rental properties in a state that complies with health and safety regulations.

Legal Obligations of Landlords

  • Landlords are responsible for ensuring that their rental units comply with health, safety, housing, and maintenance standards.
  • Failure to address mold issues may result in orders from health authorities or requests for repairs through the landlord and tenant board.
  • Tenants should notify landlords immediately if mold is detected.

When is Mold a Serious Issue?

Mold becomes a significant concern when it affects the health of tenants or causes property damage. In such cases, tenants might consider filing a complaint with the local public health unit or pursuing an application to the Landlord and Tenant Board for an order to carry out repairs.

Keep dated photos and written notices of mold, and track all landlord communications. If repairs aren’t made promptly, you can apply to the Landlord and Tenant Board or contact your local public health unit for guidance on safety steps.
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Infestations: Tenant Rights and Landlord Duties

Infestations, whether by pests, rodents, or insects, can similarly create an unwelcome living environment. In accordance with the Residential Tenancies Act, landlords must ensure their properties are free from infestations.

Steps for Tenants to Address Infestations

Landlord's Responsibilities

  • Respond promptly to tenant complaints regarding infestations.
  • Hire a professional pest control service if necessary.
  • Maintain rental units to prevent future infestations, including sealant, repairs, and regular inspections.
Tenants can also explore legal remedies if a landlord refuses to deal with a significant mold or infestation problem.

Before moving into a new rental unit, tenants are encouraged to conduct a thorough walkthrough, documenting any existing issues, as noted in the Guide to the Initial Rental Property Inspection for Tenants.

Tip: Create a dated checklist and photo log of issues before moving in, and share it with your landlord to avoid disputes later.

Tenant Rights in Ontario provide further useful information.

FAQ Section

  1. What should I do if I discover mold in my rental unit?

    Notify your landlord immediately in writing and allow them time to address the issue. If it is not resolved, you can contact local health authorities or file an application with the Landlord and Tenant Board.

  2. Is it legal for landlords to have pests in the rental property?

    No, landlords are required to maintain their properties free from infestations and should respond promptly to any tenant complaints regarding pests.

  3. What can I do if my landlord ignores my mold complaint?

    If a landlord ignores a mold issue, tenants can file a complaint with a local public health unit or the Landlord and Tenant Board for an order to carry out necessary repairs.

  4. How can I prevent mold from developing?

    Ensure proper ventilation, reduce indoor humidity, and fix leaks promptly to prevent mold growth in your rental unit.

  5. Are landlords required to disclose past mold infestations?

    In Ontario, there is no legal requirement for landlords to disclose past mold issues unless specifically asked by the tenant.

Key Takeaways

  • Mold and infestations are health and safety concerns; landlords must address them promptly under the Residential Tenancies Act.
  • Tenants should document and report mold and infestations to landlords immediately.
  • Legal recourse is available if issues are not resolved, including using tenant boards.

Need Help? Resources for Tenants

  • Landlord and Tenant Board: Official site for filing applications and tenant guidance.
  • Ontario Tenant Guide: Comprehensive guide for tenant rights and resources.
  • For legal issues, contact local tenant advocacy groups or licensed legal professionals specializing in tenancy law.

Footnotes:

[1] Residential Tenancies Act, 2006

[2] Landlord and Tenant Board

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David Chen
David Chen

Tenant Law Analyst, Tenant Rights Canada

David specializes in Ontario residential tenancy law and Northern territories housing regulations. He has followed developments at the Landlord and Tenant Board closely for over eight years and writes extensively on LTB procedures, rent increases, and maintenance obligations.