California Homebuyers Should Pay Attention to Earthquake Hazard Disclosures
California homebuyers and sellers should be aware of existing state requirements concerning earthquake-related hazards during real estate transactions.
California’s Natural Hazards Disclosure Act requires sellers or their agents to disclose certain mapped natural hazards, including properties located within designated Earthquake Fault Zones and Seismic Hazard Zones. These requirements are intended to give prospective buyers important information about potential earthquake-related risks before completing a purchase.
What the Disclosure Covers
California’s earthquake-related disclosure requirements can apply when a property is located within an officially mapped hazard area.
These include:
- Earthquake Fault Zones under the Alquist-Priolo Earthquake Fault Zoning Act
- Seismic Hazard Zones involving potential liquefaction
- Areas susceptible to earthquake-induced landslides
- Other natural-hazard areas identified on applicable official maps
The California Geological Survey maintains the state’s official earthquake hazard maps and explains that sellers of properties within mapped seismic hazard areas must disclose that fact to prospective buyers.
Why This Matters to Homebuyers
Earthquake risk can affect a property’s potential costs, insurance considerations, development restrictions and long-term value.
For example, liquefaction can occur when loose, water-saturated soil loses strength during strong earthquake shaking. Properties located within mapped liquefaction zones may therefore require additional investigation or mitigation depending on the circumstances.
For a buyer, knowing that a property is located within a mapped hazard zone provides an opportunity to conduct additional due diligence before completing the purchase.
The Natural Hazard Disclosure Statement
California’s Natural Hazard Disclosure Statement is an established part of the state’s real-estate disclosure process.
The California Geological Survey states that sellers or their agents must disclose when a property lies within a state-mapped Seismic Hazard Zone. Similar disclosure requirements apply when a property is located within an Alquist-Priolo Earthquake Fault Zone.
The California Department of Real Estate’s current 2026 real-estate law materials also describe the Natural Hazard Disclosure Statement and the circumstances under which sellers or agents may use the statutory disclosure process.
Fault Zones and Seismic Hazard Zones Are Not the Same
One important distinction for buyers is that California uses different types of earthquake hazard maps.
Earthquake Fault Zones focus primarily on the potential for surface fault rupture along active faults.
Seismic Hazard Zones identify areas where earthquake-induced ground failure, particularly liquefaction and landslides, may occur.
The California Geological Survey maintains separate regulatory programs for these hazards.
Does Every Property Require a Geological Report?
No.
This is one of the biggest points I would correct from the original article.
A property being located within a mapped seismic hazard zone does not automatically mean that every residential sale requires a new engineering or geological report.
Site-specific geotechnical investigations are generally associated with development and permitting requirements within designated Zones of Required Investigation. The California Geological Survey explains that such investigations may be required before certain development projects or permits are approved.
That is different from the disclosure obligation associated with selling an existing property.
What Buyers Should Do
Buyers considering a property in an earthquake-prone area should conduct additional due diligence.
They can:
- Check the property’s hazard zone.
- Review the Natural Hazard Disclosure Statement.
- Check the California Geological Survey’s official maps.
- Ask questions about known earthquake-related property issues.
- Review available geological or engineering reports.
- Consider professional inspections when appropriate.
- Discuss insurance and potential retrofit costs with qualified professionals.
The California Geological Survey’s EQ Zapp allows buyers and sellers to enter a property address and determine whether it falls within a mapped earthquake hazard zone.
Earthquake Risk Can Affect Property Decisions
For buyers, earthquake risk is more than a disclosure issue.
A property located in a seismic hazard area may require additional consideration regarding:
- Structural conditions
- Foundation systems
- Soil conditions
- Potential liquefaction
- Retrofitting
- Insurance
- Future construction
- Resale considerations
Buyers should avoid assuming that being outside a mapped hazard zone means a property has no earthquake risk. The California Geological Survey notes that its maps do not capture every possible earthquake or geologic hazard.
What This Means for Sellers
Sellers should make sure they understand the disclosure requirements applicable to their property.
If the property is located within an officially mapped earthquake fault or seismic hazard zone, the appropriate hazard information generally needs to be disclosed to prospective buyers.
Sellers should also keep copies of relevant reports and property documentation available when appropriate.
For complicated transactions, consulting a qualified real-estate professional or attorney can help ensure that applicable disclosure obligations are addressed.
What This Means for Real Estate Agents
Real-estate agents should carefully review the applicable natural-hazard information for properties they represent.
The California Geological Survey specifically notes that sellers and real-estate agents have disclosure obligations when properties are located within mapped earthquake hazard areas.
Agents should not assume that a property is outside a hazard area simply because the owner has never experienced earthquake-related damage.
Official state maps should be consulted when determining whether a property falls within a mapped zone.
What This Means for HOAs and Community Associations
Earthquake hazard information can also be important for condominium and HOA communities.
Boards and community managers may want to maintain information concerning:
- Building condition
- Emergency plans
- Structural inspections
- Seismic retrofits
- Insurance coverage
- Emergency communication
- Common-area infrastructure
For older communities, earthquake preparedness can be particularly important because residents may need to understand how the community would respond following a major earthquake.
California Continues to Update Earthquake Hazard Maps
The California Geological Survey continues to evaluate and update earthquake hazard information.
In May 2026, CGS released preliminary reports describing proposed Alquist-Priolo Earthquake Fault Zones for public review. The agency noted that official zones are ultimately added to its regulatory mapping application, EQ Zapp, which it identifies as the authoritative source for California’s earthquake hazard zones.
This means buyers, sellers and real-estate professionals should rely on current official maps rather than older maps or general assumptions about earthquake risk.
Final Takeaway
California already has established disclosure requirements for properties located within designated earthquake fault and seismic hazard zones.
The key issue for homeowners and buyers is not a newly verified August 2026 law requiring a geological report for every sale. Instead, California’s existing Natural Hazards Disclosure requirements require sellers or their agents to disclose applicable mapped earthquake hazards, while separate geotechnical investigation requirements can apply to certain development projects.
For buyers, the safest approach is to review the Natural Hazard Disclosure Statement and check the property’s location using California Geological Survey’s official EQ Zapp before completing the transaction.