Mold and Infestations: What Ontario Tenants Need to Know

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

Dealing with mold and infestations in rental properties can be challenging for tenants in Ontario. Understanding your rights and responsibilities is essential to maintain a healthy living environment and ensure your concerns are addressed properly and legally.

Responsibilities of Landlords and Tenants

Under the Residential Tenancies Act, 2006, landlords and tenants in Ontario have specific obligations regarding the maintenance and repair of rental properties. It is the landlord's responsibility to keep the rental unit in a good state of repair, ensuring it is safe and fit for habitation, which includes addressing mold issues and infestations.

Landlord's Duties

  • Address structural problems that could lead to mold, such as leaks and faulty ventilation.
  • Take prompt actions to eliminate infestations of pests or vermin.
  • Comply with health and safety standards to prevent potential hazards.

Tenant's Responsibilities

  • Report any signs of mold or pests to the landlord immediately.
  • Maintain cleanliness to prevent conditions that may attract pests.
  • Routinely inspect and ventilate the property to minimize mold growth.
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What to Do When You Find Mold or Infestation

When you discover mold or pests in your rental unit, act promptly.

Document the problem with dates and exact locations, and notify your landlord in writing as soon as possible. Keep copies of all messages and photos so you have a clear record if you need to escalate the matter.

Steps to Address the Issue

  1. Report the Issue: Inform your landlord in writing, detailing the location and extent of the problem.
  2. In your written report, include the unit number, the exact locations of mold or pests, dates, and any steps you’ve already taken. Send the report by email or another traceable method and keep a dated copy.
  3. Document Everything: Take photos and keep records of any communication with your landlord.
  4. Follow Up: If the issue is not addressed, contact local health authorities or tenant services for further assistance.
  5. Legal Action: In serious cases where the landlord does not address the issue, tenants can apply to the Landlord and Tenant Board for a remedy.
Keep a running log of statements and actions, and store all photos and receipts. These records support your case if health authorities or the Landlord and Tenant Board become involved.

Legal Forms and Resources

If you need to escalate the issue legally, you might need to submit forms to the Landlord and Tenant Board. Some forms that could be relevant include:

  • T2 – Application About Tenant Rights: Use this form to address landlord responsibilities that are not met, such as failure to repair. More information and the form can be found here.
  • C1 – Notice of Change in Tenant Information: Submit if a change affects how you are listed on the tenancy agreement.

Preventive Measures for Tenants

As a tenant, taking preventive measures can help reduce the likelihood of mold and infestations.

Ensure regular cleaning and ventilation and promptly repair small problems to prevent them from becoming larger issues.

Additional Tenant Resources

Explore Rental Homes in Ontario

Discover affordable homes for rent in Canada, including pet-friendly options and more.

  1. When should I contact a health inspector about mold? If your landlord fails to address reported mold issues, you can reach out to your local public health unit for an inspection.
  2. Can I withhold rent due to unresolved infestations? Tenants should not withhold rent; instead, they can file a complaint with the Landlord and Tenant Board.
  3. What health risks are associated with mold exposure? Mold exposure may lead to respiratory issues, allergic reactions, and other health problems, depending on sensitivity and extent of exposure.

Need Help? Resources for Tenants

If you're dealing with unresolved housing issues involving mold or infestations, the following resources may help:


  1. What legal steps can a tenant take if the landlord does not address mold? Tenants can file a T2 application with the Landlord and Tenant Board, along with any evidence of the issue and attempts to resolve it with the landlord.
  2. How can mold affect my health? Mold exposure can cause health issues such as allergies, skin irritation, and respiratory problems.
  3. What should I do if I notice pests in my rental unit? Report the issue to your landlord immediately in writing, and follow up to ensure prompt action is taken.

Quick Tip: Regular cleaning and addressing small problems as soon as they arise can help prevent mold and infestations.

Mold and pest issues can be a significant concern for tenants in Ontario. By understanding your rights and responsibilities under the Residential Tenancies Act, 2006, you can take appropriate action to resolve these issues effectively.

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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.