This second part focuses on the practical steps California landlords should take to remediate mold,
communicate with tenants, document issues properly, and prevent future problems. These processes not only
ensure compliance with California law but also protect your rental property value and reduce liability.
Why Proper Mold Remediation Procedures Matter
Mold isn’t simply a cleaning issue – it’s a health and habitability concern.
Improper remediation can:
● Allow mold to return
● Cause tenant health complaints
● Lead to code enforcement involvement
● Result in legal claims or rent reduction
● Increase property damage over time
Landlords who follow a structured remediation process minimize risk and address the root problem effectively.
How to Conduct a Proper Mold Inspection in a Rental Property
A thorough inspection identifies three critical things:
1. Source of Moisture
Mold cannot grow without water. The inspection should include:
● Plumbing
● Roofing
● Windows and flashing
● HVAC condensation
● Exterior drainage
● Tenant-related moisture (showers, cooking, drying clothes indoors)
2. Extent of Mold
Surface mold on tile grout is far different from mold inside walls or insulation.
3. Whether Professional Remediation Is Needed
General rule:
● Under 10 sq. ft. → Minor & may be cleaned by maintenance
● Over 10 sq. ft. → Requires professional remediation
California landlords should document all findings and repair decisions.
Hiring a Professional Mold Remediation Company
When the issue is significant, landlords should rely on licensed mold remediation companies. A reputable
company will:
● Contain affected areas
● Use HEPA filtration
● Remove contaminated materials properly
● Clean and disinfect using approved treatments
● Perform clearance testing if required
Professional remediation is not only safer but also strengthens legal protection should a dispute arise later.
Timeline Requirements Under California Law
California law requires repairs to be made within a reasonable time, typically interpreted as:
● 24–48 hours to address water leaks
● 7–10 days to make repairs after notice
● Immediately, if the condition threatens habitability
Landlords who delay risk:
● Rent withholding
● Tenant relocation expenses
● Code enforcement citations
Prompt action is both a legal requirement and smart risk management.
How to Communicate With Tenants During Mold Issues
Clear, written communication helps maintain trust and prevents disputes.
When mold is reported, landlords should:
1. Acknowledge the report in writing
2. Schedule an inspection promptly
3. Provide entry notices
4. Explain the next steps
5. Update tenants throughout the process
If the tenants caused the mold, landlords should provide:
● Evidence (photos, inspection notes)
● A description of lease violations (e.g., not using ventilation)
● A timeline for corrective action
● Potential charges
● Mold-prevention instructions
Professional and factual communication prevents escalation.
Tenant Responsibilities Under California Law
Under SB 655, tenants are responsible for mold caused by:
● Failure to maintain cleanliness
● Failure to ventilate
● Blocking air circulation
● Causing water damage
● Ignoring moisture or mold until it becomes severe
Landlords can charge tenants for remediation if their actions caused the issue. A mold addendum is essential to
support this.
Documentation Landlords Should Keep
Proper documentation is your strongest protection.
Keep:
● Photos/video of mold and moisture
● Tenant maintenance requests
● Inspection reports
● Invoices from remediation companies
● Lease agreements and mold addendums
● Tenant communication logs
● Receipts for repairs
Good documentation makes disputes easier to resolve and supports security deposit deductions when needed.
How Mold Affects Security Deposit Deductions
Landlords may deduct from a tenant’s deposit when:
● Mold resulted from tenant behavior
● Tenant failed to report leaks promptly
● Poor housekeeping contributed to mold
● The tenant caused water damage (overflow, spills, etc.)
Landlords may not deduct when mold is related to:
● Plumbing failures
● Structural leaks
● Normal wear-and-tear moisture issues
Providing a detailed itemized statement with photos and invoices is critical.
Preventing Mold Recurrence After Remediation
Even after mold is removed, landlords must ensure the problem doesn’t come back.
1. Address the moisture source completely
This may require:
● Upgraded ventilation
● Resealing windows
● Replacing plumbing
● Improving exterior drainage
2. Use mold-resistant materials
For example:
● Mold-resistant drywall
● Waterproof paint
● Caulk with mold inhibitors
3. Install ventilation upgrades
Timed bathroom fans and continuous low-flow exhaust systems dramatically reduce mold recurrence.
4. Educate tenants at move-in
Provide:
● Moisture control tips
● Instruction on ventilation
● Policies requiring prompt reporting of leaks
Proactive oversight reduces long-term maintenance costs.
How to Protect Yourself From Mold-Related Liability
To reduce risk:
● Respond immediately to mold reports
● Document all steps
● Hire licensed professionals
● Keep written communication
● Perform regular inspections
● Include a mold addendum in every lease
Most mold disputes escalate because of delays, not because of the presence of mold itself.
Conclusion for Part Two
Mold management is a critical part of operating rental property in California. With strong laws protecting
tenants and high expectations for habitability, landlords must follow best practices for inspection, remediation,
documentation, and communication. By responding quickly, working with professionals, and setting clear
tenant expectations, landlords can minimize mold issues and avoid legal complications. Protecting your
property from mold is not only a maintenance responsibility — it’s a smart investment in long-term asset
preservation.
Disclaimer: This information is provided for informational purposes only and does not constitute legal advice.
The author of this document is not an attorney, and the information presented should not be considered as a
substitute for professional legal advice.
The article was written by Jacob Canter, managing broker and owner of Sail Properties, Inc. After attending
university in Irvine, he spent a year teaching English in China. Upon his return, he combined his love of his
hometown with his passion for real estate. After obtaining his real estate license and becoming a Realtor in
2014, Jacob joined Sail Properties Team. He has worked for the team handling real estate sales, leasing,
service requests, vacation rentals, and HOA accounts. He later obtained his Brokers license in 2016 and
purchased the business that is his passion in 2023. For more information, feel free to reach out by phone,