Landlord Guide to Dealing with Mold in Your San Diego Rental Property

Does your rental property have mold?  Curious what to do next and who’s responsible?  In this post, we dive into the complexity surrounding mold claims including how to manage current claims and prevent future issues.

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As a responsible landlord in California, it’s crucial to prioritize the health and safety of your tenants. One issue that can arise in San Diego rental properties is mold. Addressing mold in your rental property not only ensures the well-being of your tenants but also helps protect your investment. In this guide, we will explore the legal obligations of landlords in California regarding mold, steps for mold remediation, preventive measures to minimize mold problems, important insurance considerations, and landlord rights.

Key Take-aways

  • Mold issues in rental properties need to be addressed promptly to maintain a safe, habitable environment and to comply with legal obligations.
  • Remediation of mold often requires professional services to safely remove and sanitize the affected areas.
  • Preventive measures such as proper ventilation, regular inspections, tenant education, and swift response to water damage are critical in maintaining a mold-free environment.
  • Landlords should review their insurance policies to understand the extent of mold-related coverage. Keeping detailed records of mold-related incidents and remediation efforts can be essential in insurance disputes.
  • If mold growth is due to a tenant’s improper use of the property, the tenant may be held liable for the costs of inspection and remediation.
  • Compliance with local laws regarding security deposit deductions for mold damage is crucial to avoid potential legal issues.
  • Landlords can benefit from the services of a professional property manager to navigate the complexities of mold management and compliance.

Legal Obligations of Landlords in California

Under the California Health & Safety Code (HSC §17920.3), landlords must maintain their rental properties in a habitable condition, which includes addressing a mold infestation. San Diego landlords must ensure that their properties are free from conditions that could lead to mold growth or mold spores, such as water leaks or excessive moisture, and other conditions where mold grows. Additionally, if mold is detected, landlords must take appropriate measures to remediate it.

Landlord Mold Disclosure Requirements

As per California's Residential Landlord-Tenant Act, landlords are required to provide written disclosure to prospective tenants in the lease or rental agreement regarding any known mold in the property that exceeds permissible exposure limits or poses a health threat. This disclosure should also include information about the potential health risks associated with mold exposure.

An addendum to the lease or rental agreement detailing these aspects can serve as a mold disclosure. This not only ensures the safety and health of the tenants but also protects the landlords from future liabilities related to mold issues.

Failure to disclose this information could lead to legal penalties, including potential lawsuits from tenants for health issues arising from undisclosed mold exposure. The law hence emphasizes the importance of transparency, promoting the health and safety of tenants, and underlining the landlord's responsibility in maintaining habitable housing conditions.

California Landlord's Mold Repair Obligations

In accordance with the California Health & Safety Code, San Diego landlords are required to carry out necessary repairs or remediation once mold is identified in a rental property. This includes professional inspection and mold removal, fixing leaks that may have caused mold growth, and restoring affected areas to pre-mold conditions. Landlords who fail to promptly address mold issues may be held liable for any health problems tenants might experience due to mold exposure.

Furthermore, if the landlord fails to cooperate or neglects mold problems, tenants may be able to withhold rent, move out without notice, or sue for damages in extreme cases as per the California Civil Code Section 1941.1. Landlords need to understand these obligations and act swiftly to protect both the tenants' health and their own legal standing.

NOTE: Landlords in California are not explicitly required by law to perform regular mold testing or a professional mold inspection in their rental properties. However, they must respond to any tenant complaints concerning mold promptly and effectively. If a tenant reports a potential mold problem or conditions that may lead to mold growth, such as leaks or persistent humidity, the landlord should arrange for a professional inspection to verify the presence of a mold problem and determine its extent.

Other Laws and Regulations Regarding Mold in California

In addition to the aforementioned disclosure law, California also has specific mold regulations under the Toxic Mold Protection Act of 2001. This act mandates the Department of Public Health (DPH) to set permissible exposure limits to mold and provide guidelines for mold assessment and remediation.

Furthermore, the California Department of Consumer Affairs’ Landlord-Tenant Guidelines list mold as a potential health hazard that should be eliminated promptly. Under these guidelines, landlords could be considered negligent if they fail to address mold problems once notified.

Being proactive and responsive in dealing with mold issues will not only keep you within the bounds of the law and avoid helf of safety hazards but also help maintain a healthy living environment for your tenants.

Additional Resources

For more detailed information on how to handle mold issues within rental properties in California, landlords can refer to the following resources:

    1. California Department of Public Health: This government website provides valuable information on indoor mold and health, including guidance for landlords on how to manage mold problems correctly.
    2. Nolo’s California Landlord’s Law Book: Rights & Responsibilities: This comprehensive guide offers detailed advice on the legal responsibilities of landlords in California.
    3. California Tenants – A Guide to Residential Tenants' and Landlords' Rights and Responsibilities: This document, published by the State of California, provides an overview of both landlords' and tenants' rights and responsibilities, including those related to mold issues.
    4. County of San Diego – Department of Environmental Health: This department maintains a comprehensive guide on mold in homes, providing advice and resources on mold prevention and remediation.
    5. San Diego Housing Commission: The SDHC provides useful resources for landlords, and may provide guidance on mold-related issues in the context of San Diego's specific climate and conditions.

By familiarising themselves with these local resources, landlords can ensure they are well equipped to prevent and respond to mold issues in their rental properties, protecting their investments and maintaining the health and satisfaction of their tenants.

Steps for Mold Remediation

When mold is discovered in your rental property, it's essential to follow proper remediation steps to effectively address the issue. These steps typically include:

  1. Inspection and Assessment: Hire a professional mold inspector to identify the extent of the mold problem and determine the underlying cause.
  2. Removal and Cleanup: Engage the services of a certified mold remediation specialist to safely remove the mold and sanitize the affected areas. This may involve removing affected materials, such as drywall or carpeting, and thoroughly cleaning surfaces.
  3. Prevention of Future Growth: Identify and address the root cause of the mold growth, such as fixing leaks, improving ventilation, or reducing moisture levels. Taking preventive measures will help minimize the likelihood of mold recurring.

In properties constructed before the 1980s, there is a high potential for the presence of asbestos, a harmful material once widely used in construction for its fire-resistant properties. Asbestos poses significant health hazards when its fibers become airborne, and it is particularly dangerous during renovations or demolition work that disturbs the material.

Landlords should be aware that if mold remediation involves disturbing potential asbestos-containing materials, a certified asbestos professional should be engaged to assess and handle the situation. This ensures that the remediation process remains safe, protecting both the tenants and the property.

Preventive Measures for Mold Growth

Preventing mold growth is key to maintaining a healthy rental unit. Here are some preventive measures that landlords should consider:

  • Proper Ventilation and Moisture Control: Ensure adequate air circulation and ventilation in areas prone to moisture, such as bathrooms and kitchens. Install and maintain exhaust fans to reduce humidity levels.
  • Regular Inspections and Maintenance: Conduct routine inspections of your property to identify and address any water leaks, plumbing issues, or areas of excess moisture promptly.
  • Tenant Education and Awareness: Educate your tenants about the importance of proper ventilation, reporting leaks promptly, and promptly notifying you of any signs of mold growth. Encourage them to maintain good housekeeping practices to prevent moisture accumulation.
  • Immediate Response to Water Damage: Respond immediately to any water leaks or damage. Dry out affected areas within 24-48 hours to prevent mold from growing.

By being proactive and taking necessary precautions, landlords can help prevent mold growth and ensure the health and safety of their tenants. Remember, prevention is always better than remediation to achieve a mold free environment!

Insurance Considerations for Mold Damage

When it comes to mold in your rental, insurance coverage can vary. It's crucial to review your insurance policy to understand the extent of coverage for mold-related issues. Some policies may provide limited coverage, while others may exclude mold damage altogether.

Keep detailed records and documentation of any mold-related incidents, including remediation efforts and expenses. In the event of a dispute with your insurance provider, these records can serve as evidence of diligence in addressing the issue. As always, it's advisable to consult with an insurance professional for guidance on coverage options and potential risks.

How to Tell If There's Mold in Your House

Mold Caused by Tenants and Landlord's Rights

While landlords are generally responsible for the maintenance and habitability of the rental property, including addressing mold issues, there are instances where tenants may be held accountable. If the mold growth is a result of the tenant's improper use of the rental unit or failure to adhere to terms in the lease agreement, such as adequately ventilating the property or promptly reporting leaks, the tenant may be held liable for the cost of a mold inspection or remediation to prevent a serious mold problem.

In these instances, landlords may be able to deduct the cost of mold remediation from the tenant's security deposit per California Civil Code 1950.5. Before doing this, it's important to provide the tenants with an itemized statement detailing the specific reasons for deductions, including the cost of repairing the mold damage. Deductions from a security deposit must comply with state laws and regulations. Landlords need to understand these regulations, as improper deductions could lead to legal issues.

Always consult with a legal professional or trusted resource to ensure compliance with local laws regarding security deposit deductions for mold damage.


Addressing mold issues promptly is not only a legal obligation for landlords in California but also crucial for maintaining a safe and habitable rental property. By understanding your responsibilities, following proper remediation steps, implementing preventive measures, and reviewing your insurance coverage, you can effectively manage mold-related challenges.

If you find the complexities of property management overwhelming, consider utilizing the services of a professional property manager who can help ensure compliance and provide expert guidance.

The Crestmont Team


Common signs of mold growth include a musty odor, visible mold spots (which can be in various colors like black, white, green, or gray), and health symptoms in tenants such as persistent cough, difficulty in breathing, eye irritation, or skin rashes.

Professional mold remediation services specialize in safely and effectively removing mold from your property. They assess the extent of the mold damage, plan and execute the remediation process, and take steps to prevent future mold growth.

It's advisable to inspect your property regularly, ideally every 3-6 months. Prompt inspections can be crucial after incidents that could potentially lead to mold growth, such as water leaks or flooding.

If mold growth is due to a tenant's negligent behavior, such as failing to report a water leak promptly or not maintaining proper ventilation, the tenant may be responsible for the cost of remediation.

If your insurance policy does not cover mold damage, consider seeking advice from an insurance professional about adding a mold endorsement or a separate mold insurance policy. Always keep detailed records of all mold-related incidents and remediation efforts, as these may be required during insurance claim disputes.

Preventive measures include ensuring adequate ventilation, regular property inspections, immediate repair of leaks, and educating tenants about their role in preventing mold growth.

Consult with a legal professional or trusted resource to understand your options. These may include deductions from the security deposit, issuing a formal warning, or in extreme cases, eviction.

While minor mold issues can sometimes be addressed using store-bought cleaning products, it's safer and more effective to hire professional mold remediation services, especially for larger infestations.

Yes, unchecked mold growth can lower property value, as it could signal neglect and potential health risks to prospective tenants or buyers.

Exposure to mold can lead to health issues like allergic reactions, respiratory problems, eye irritation, skin rashes, and in severe cases, neurological problems or immune disorders.


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