California Landlord Radon Testing and Disclosure Rules

Understanding your health and safety rights is crucial when renting a home in California. If you’re concerned about radon—a naturally occurring radioactive gas found in some buildings—you may be wondering what your landlord is required to do about radon testing and disclosure. This article explains current California rules and guidance on landlord responsibilities, tenant protections, and what you can do if you’re concerned about radon in your rental.

What Is Radon and Why Does It Matter for California Renters?

Radon is a colorless, odorless gas that forms from natural radioactive decay in soil. Breathing in high levels of radon over time can increase your risk of lung cancer. According to the California Department of Public Health (CDPH), some areas of California have higher radon levels, particularly in parts of the Sierra Nevada, Northern, and Central Coast regions.

Are California Landlords Legally Required to Test for Radon?

As of 2024, there is no statewide law in California requiring landlords to test rental properties for radon. Unlike lead-based paint or mold, California building or health codes do not specifically mandate radon testing or mitigation for rental housing.

However, landlords have a general duty under the California Civil Code Section 1941.1 – Implied Warranty of Habitability to provide safe, livable housing free of conditions that might endanger a tenant’s health.

What Are Landlords Required To Disclose About Radon?

While there is no specific requirement for landlords to test or disclose radon levels in rentals, if a landlord knows that dangerous radon levels exist in the building, they must disclose that information to tenants under California Civil Code and general duty of honesty and good faith in contracts.

Some California cities—like Los Angeles or San Francisco—may have stricter local rules, so always check with your city or county housing department. Many government agencies encourage voluntary radon testing, especially in higher-risk areas.

Official Forms for Radon Disclosure or Health Complaints

There is no state-issued form specifically for radon disclosure. However, if you believe radon or any hazardous condition is present and not addressed by your landlord, you can:

• Submit a written repair request directly to your landlord citing health concerns
• Request assistance from your local public health department
• File a Substandard Housing Complaint with your city/county code enforcement agency. Most major cities have online forms, such as the City of Los Angeles Code Enforcement Complaint Form.

Example: A renter who suspects radon after noticing high readings with a home test kit may send a written repair request to their landlord, and also file a “Substandard Housing Complaint” form (typically found on city or county websites) if they receive no response.

What Happens After Filing a Substandard Housing Complaint?

Your city or county code enforcement may investigate the property and, if hazardous conditions are confirmed, could require the landlord to remedy the problem. For official guidance, refer to the California Department of Consumer Affairs' information on substandard housing complaints.

Your Rights and Protections as a California Renter

Even though no state law directly mandates radon testing for landlords, you still have the right to a safe and habitable living space. If you suspect a hazardous condition:

• Communicate concerns in writing to your landlord
• Gather any evidence (such as test results or doctor’s notes)
• Contact your city or county housing authority or public health office if needed

Tribunal or Board Handling Disputes

For official help, renters can apply to the California Superior Court – Housing Division to resolve landlord-tenant disputes, including issues about habitability, repairs, and withholding rent due to safety hazards.

For more legal details, refer to the California Civil Code Sections 1941–1942.

Frequently Asked Questions

1. Are California landlords required to test rentals for radon?
   No, there is no California law mandating radon testing by landlords in residential rental properties.
2. Can I request radon testing in my apartment?
   You can ask your landlord to test, especially if you live in an area known for high radon. The landlord is not required to comply, but it helps to make the request in writing.
3. What if my home tests high for radon?
   Notify your landlord in writing and request repairs. If unresolved, you may file a substandard housing complaint with your local code enforcement agency.
4. Is there an official form for reporting radon issues?
   California does not issue a special radon form. Use your city’s substandard housing complaint form or submit a written notice to your landlord.
5. Where can I get more information about radon risks and local requirements?
   Visit the California Department of Public Health Radon Program for details and assistance.

Key Takeaways for Renters

• California does not require landlords to test rentals for radon, but they must provide safe, habitable housing.
• Landlords must disclose known hazardous conditions; if you suspect radon, communicate with your landlord and contact local agencies if needed.
• Use city or county substandard housing complaint forms to report unresolved safety hazards.

These points summarize your main options and rights regarding radon concerns in California rental housing.

Need Help? Resources for Renters

• California Department of Public Health Radon Program – Information and guidance on radon testing and health risks
• California Department of Consumer Affairs: Resolving Habitability Problems
• California Courts – Housing Division for rental dispute resolution
• Contact your city or county code enforcement office for specific complaint forms and health department contacts
• Local tenant legal aid services are often available—check city websites for trusted organizations

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1. California Civil Code Section 1941.1 – Landlord's Duty to Maintain Habitable Property
2. California Department of Public Health – Radon Program
3. California Department of Consumer Affairs – Habitable Condition Problems
4. California Courts – Housing

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