Mold and Infestation Issues in Ontario Rentals

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

Dealing with mold or infestations in your rental property in Ontario can be a significant concern, affecting both your health and the condition of your living space. As a tenant, knowing how to address these issues is vital. Here, we outline your rights and responsibilities under Ontario's Residential Tenancies Act, 2006, and provide steps for dealing with these common rental issues effectively.

Understanding Tenant and Landlord Responsibilities

In Ontario, landlords are required by law to keep rental units in a good state of repair, which includes being free from mold and infestations. Mold often arises from inadequate ventilation or hidden water leaks, while infestations might result from food remnants or improper sanitation.

As a tenant, you have responsibilities too. Ensuring your living area is clean and free from conditions that might attract pests is fundamental. If you notice an issue, report it to your landlord promptly.

Keep a brief written log of dates you notice issues and when you reported them; attach photos when you report in writing.
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Addressing Mold in Your Rental

  • Notify your landlord immediately upon detecting mold.
  • Request a mold inspection, preferably conducted by a professional.
  • Document the mold with photographs and written records.

If your landlord fails to act, you can apply to the Landlord and Tenant Board (LTB) for intervention.

If the landlord doesn't respond, document all attempts to contact them and prepare a timeline; you may need to file a maintenance or rent-issue claim with the LTB.

Dealing with Infestations

  • Keep your home clean and store food properly to avoid attracting pests.
  • Alert your landlord as soon as you detect any signs of infestation.
  • Request pest control services and keep copies of all communications.

Persistent issues without landlord action may justify a case with the LTB for rent reduction or rectification.

LTB outcomes vary; gather repair records and keep communications as evidence, since unresolved problems can lead to rent relief or rectification orders.

Legal Protections and Forms

The Residential Tenancies Act, 2006, provides tenants with the right to live in safe, habitable conditions. If these are compromised, you have recourse through official complaints and tribunal applications.

You can use Form T6 to report maintenance issues like mold or pests; keep copies of the form and all correspondence for your records.

Use the Form T6: Tenant Application About Maintenance, available from the LTB's official site, to complain about repair issues, including molds and infestations.

Living a Mold and Pest-Free Experience

Ensuring a healthy living environment is a shared responsibility. While landlords must provide adequate living conditions, tenants should maintain cleanliness and report problems in a timely manner. Understanding your rights can significantly enhance your rental experience.
Explore detailed tenant protections through Tenant Rights in Ontario. For broader Canada-wide rental options, you can Search Canadian rentals with interactive map view.

For example, after noticing mold, take photos, notify the landlord in writing, and follow up if no action within a reasonable period.
  1. What steps can I take if my landlord won't fix mold issues? Document the issue, communicate regularly with your landlord, and use Form T6 at the LTB if necessary.
  2. How do I handle a pest problem that the landlord ignores? Keep records of communications and consider filing a T6 form with the LTB for lack of landlord action.
  3. Are regular maintenance and repair mandatory responsibilities of landlords? Yes, according to the Routine Repairs in Rental Units: Tenant and Landlord Responsibilities page, landlords must ensure rental habitability.
  4. What if my landlord refuses to address a recurring pest problem? File a complaint with the LTB and consider yielding the support of local tenant advocacy groups.

Need Help? Resources for Tenants

If you need further assistance dealing with mold and infestations in your rental unit, consider contacting the Landlord and Tenant Board or seeking advice from tenant advocacy organizations like the Toronto Tenant Hotline at (416) 921-9494.


  1. Residential Tenancies Act, 2006
  2. Landlord and Tenant Board
  3. LTB Forms

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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.