Tenant Rights on Mold and Infestations in Ontario

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

Mold and infestations can be a serious health concern for tenants in Ontario. Being aware of your rights as a tenant can help you address these issues effectively and ensure that your living conditions are safe and healthy. This guide provides a comprehensive overview of how to handle mold and pest issues in rental properties in Ontario.

Understanding Your Rights as a Tenant

Under the Residential Tenancies Act, 2006, landlords in Ontario have the obligation to maintain their rental properties in a habitable condition. This means the property must be fit for living, and free of health hazards such as mold and pest infestations.

Mold: A Common Issue in Rentals

Mold growth can occur in areas with excessive moisture and poor ventilation. It can lead to respiratory issues and other health problems. As a tenant, you have the right to live in a mold-free environment.

If you spot mold, document it with dated photos and keep all notices to your landlord. Request remediation in writing and, if the issue isn’t addressed promptly, contact your local health department or the Landlord and Tenant Board for guidance.
  • If you notice mold, report it to your landlord in writing as soon as possible.
  • Your landlord is responsible for making necessary repairs to prevent further mold growth.
  • Keep records of all communications and repairs related to mold issues.
Under Ontario law, landlords must repair mold problems promptly and keep tenants informed. Maintain a file of dates, notices, and remediation steps to support any future LTB application.

Handling Pest Infestations

Pest infestations can range from rodents to insects, and they can severely affect your quality of life. Like mold, addressing pest issues is a part of the landlord’s responsibility under Ontario's tenancy laws.

  • Document any signs of pests and immediately notify your landlord in writing.
  • Your landlord should arrange and cover the cost for extermination services.
  • Ensure that preventive measures are taken to avoid future infestations.
If pests persist after you report them, require a formal pest-control plan with timelines and receipts. Recurrent infestations can strengthen your case for rent relief or required repairs.
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Legal Remedies for Unresolved Issues

If your landlord fails to address mold or pest issues, you have several options:

  • File a Complaint: Consider filing a complaint by contacting the local health department or the Landlord and Tenant Board (LTB) in Ontario.
  • Apply to the LTB: Tenants may apply to the LTB for an order requiring the landlord to carry out repairs or to compensate for reduced enjoyment of the property.
Keep detailed records of all communication, inspections, and repairs to solidify your case if legal action is necessary.

Resources for Tenants

To learn more about your rights and responsibilities as a tenant facing mold or infestation issues, visit the Tenant Rights in Ontario page for detailed provincial regulations.

Tenant Tips for Preventing Mold and Infestations

  • Ensure proper ventilation in damp areas to reduce moisture build-up.
  • Keep living spaces clean and free of food debris to deter pests.
  • Report leaks or other maintenance issues promptly to your landlord.

When to Contact the Landlord and Tenant Board

The Landlord and Tenant Board (LTB) serves as Ontario’s official tribunal for residential tenancy disputes. You should contact the LTB if:

  • Your landlord fails to address mold or infestations adequately.
  • You need to apply for a rent reduction or file a formal dispute.
  1. What are my immediate steps if I discover mold or pests in my rental?

    Notify your landlord in writing promptly and keep a record of all communications and repairs.

  2. How long does the landlord have to address mold and pest issues?

    The landlord should address these issues promptly, with the specific timeframe depending on the severity and nature of the issue.

  3. Can I withhold rent if mold or pest issues aren't addressed?

    Withholding rent is not recommended as it may lead to legal repercussions. Instead, apply to the LTB for resolution.

  1. How to report a mold problem to your landlord?

    Email or send a written notice to your landlord outlining the issue, location of the mold, and request for remediation.

  2. How to file a repair application with the LTB?

    Use Form T6 - Tenant Application about Maintenance to file your application with the LTB. Provide detailed evidence and documentation.

Need Help? Resources for Tenants

If you need additional support, consider reaching out to the following resources:


1. Residential Tenancies Act, 2006

2. Landlord and Tenant Board (LTB)

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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.