The California Natural Hazard Disclosure Act requires the seller of most single-family homes to tell the buyer, on a specific statutory form, whether the property sits inside any of six mapped hazard zones covering floods, wildfires, and earthquakes. The duty runs against the seller personally and against the seller’s agent, and it is set out in Civil Code Sections 1103 through 1103.14. A seller who skips the disclosure or fills it out carelessly is exposed to a lawsuit for the buyer’s actual damages.
Which Sales Are Covered
The Act reaches a broad set of residential transfers of single-family property: ordinary sales, exchanges, real property sales contracts, leases with a purchase option, other purchase options, and ground leases coupled with improvements.1California Legislative Information. California Civil Code 1103 If you are selling a single-family home under a standard purchase agreement, the Act almost certainly applies.
Section 1103.1 exempts several categories. The common ones:
- Court-ordered transfers, including probate sales, foreclosure sales, sales under a writ of execution, eminent domain, and specific performance decrees.
- Default and foreclosure situations, including transfers from a defaulting borrower to a lender, trustee sales, and bank-owned resales.
- Fiduciary transfers by a trustee, guardian, conservator, or estate representative. The exemption drops away if the trustee is an individual running a revocable trust and was the former owner or an occupant within the past year.
- Transfers between co-owners, between spouses, between blood relatives, and between spouses in a divorce or legal separation.
- Any sale, transfer, or exchange to or from a government entity.
- Ordinary leases of any duration. A lease-option or a ground lease with improvements is not exempt.
Transactions in these categories do not require the natural hazard disclosure.2California Legislative Information. California Civil Code 1103.1
The Six Hazard Zones
The statute identifies six specific mapped zones. There is no materiality judgment and no discretion. If the maps place the property inside a zone, the seller checks the box.
Flood Zones
The first is a Special Flood Hazard Area, meaning any Zone A or Zone V on FEMA’s flood maps. These areas carry roughly a one-percent annual chance of flooding.1California Legislative Information. California Civil Code 1103 The second is an Area of Potential Flooding, meaning a location that could be inundated if a dam or similar water-control structure fails, as designated under Water Code Section 6161.
Wildfire Zones
The third zone is a Very High Fire Hazard Severity Zone, mapped by the Office of the State Fire Marshal and local agencies based on vegetation, terrain, fire history, and projected flame length. Properties in these zones face additional obligations under Government Code Section 51182, including vegetation management and building-material standards.3Office of the State Fire Marshal. Fire Hazard Severity Zones
The fourth is a Wildland Area that may contain substantial forest fire risks and hazards, broadly aligning with State Responsibility Areas where the state, rather than a local agency, has primary responsibility for fire prevention and suppression.
Earthquake and Seismic Zones
The fifth is an Earthquake Fault Zone, mapped by the State Geologist under the Alquist-Priolo Earthquake Fault Zoning Act. These zones follow the traces of active faults and average roughly a quarter mile in width.4California Department of Conservation. Alquist-Priolo Earthquake Fault Zones Structures for human occupancy generally cannot sit directly over the fault trace and must maintain a minimum setback.
The sixth is a Seismic Hazard Zone, mapped under the Seismic Hazards Mapping Act. These zones identify areas prone to liquefaction, where water-saturated soil loses stability during shaking, and to earthquake-induced landslides.5California Department of Conservation. California Seismic Hazard Zones Where Earthquake Fault Zones focus on ground rupture, Seismic Hazard Zones flag ground that may fail underneath a structure.
The Disclosure Statement
The disclosure has to be made on a specific statutory form, the Natural Hazard Disclosure Statement. Section 1103.2 sets the exact format, with a field for each of the six zones where the seller indicates whether the property is or is not located in that zone.6California Legislative Information. California Civil Code 1103.2 The form is available through brokerages and disclosure services.
At the bottom, the form offers two certifications. Under the first, the seller and agent represent that the information is true and correct to the best of their knowledge. Under the second, they acknowledge they relied on an independent third-party disclosure provider and have not independently verified the report. One box gets checked. The seller and the seller’s agent sign, and the buyer signs an acknowledgment confirming receipt.
The form itself carries a warning that these designations may limit the ability to develop the property, obtain insurance, or receive disaster assistance, and that the maps estimate where hazards exist without guaranteeing that any particular property will or will not be affected by a natural disaster.6California Legislative Information. California Civil Code 1103.2
Using a Third-Party Report
Few sellers check their address against six separate sets of government maps themselves. Professional disclosure firms match the property address and assessor’s parcel number against current state and federal hazard maps and produce a report identifying any overlaps. Report fees typically fall in the $50 to $150 range.
Using a qualified third party also builds a liability shield. Under Section 1103.4, neither the seller nor the agent is liable for errors in the disclosure if three conditions are met: the error was not within their personal knowledge, the information came from a public agency or a qualified professional, and they exercised ordinary care in obtaining and passing it along.7California Legislative Information. California Civil Code CIV 1103.4 The statute defines qualified professionals as licensed engineers, land surveyors, geologists, or experts in natural hazard discovery working within the scope of their license or expertise.
A third-party report does not replace the statutory form. The seller still delivers a completed and signed Natural Hazard Disclosure Statement, checking the second certification box to indicate reliance on the report.
One caveat about reports: they are only as current as the underlying maps. FEMA is required to review community flood maps every five years and decide whether they need updating.8FEMA. Notice to Congress: Monthly Update on Flood Mapping – February 2026 The State Fire Marshal completed updated State Responsibility Area maps effective April 2024 and released updated Local Responsibility Area maps in phases through early 2025.3Office of the State Fire Marshal. Fire Hazard Severity Zones A property outside a hazard zone two years ago may be inside one today. If a seller’s report is more than a few months old, confirm it against the current maps before closing.
When to Deliver, and the Buyer’s Right to Cancel
The seller must deliver the completed disclosure to the buyer as soon as practicable before transfer of title. For real property sales contracts, lease-options, and ground leases, delivery should happen as soon as practicable before the contract is executed.9Justia Law. California Civil Code 1103.3
If the disclosure arrives after the buyer has already signed an offer, the buyer gets a rescission window. The buyer has three days after hand delivery, or five days after the seller mails the disclosure, to cancel the offer by delivering written notice of termination to the seller or the seller’s agent.9Justia Law. California Civil Code 1103.3 The same windows apply to electronic delivery where the parties have agreed to conduct the transaction electronically, and they reset when the seller sends a material amendment.
Sellers who wait until late in escrow hand the buyer a free exit. Delivering the form early, with or before the purchase agreement, closes the rescission window entirely.
What a Hazard Zone Actually Costs
A designation is not just a checked box. It carries ongoing financial consequences.
Properties in a Special Flood Hazard Area trigger mandatory flood insurance when the buyer finances the purchase with a federally backed mortgage. Federal lending rules prohibit covered institutions from making a loan secured by improved property in an SFHA unless the borrower carries flood insurance for the life of the loan, with minimum coverage equal to the lesser of 100 percent of the replacement cost of the improvements, the maximum available under the National Flood Insurance Program, or the unpaid principal balance.10Fannie Mae Selling Guide. Flood Insurance Requirements for All Property Types If the community does not participate in the NFIP, the property is ineligible for purchase by Fannie Mae, which can foreclose conventional financing.
Very High Fire Hazard Severity Zone properties are subject to defensible-space rules, vegetation management, and fire-resistant building-material standards. These are ongoing obligations, not one-time compliance items, and they can raise the annual cost of ownership, particularly on wooded lots.
Earthquake Fault Zones restrict what can be built. Structures for human occupancy generally cannot sit directly over an active fault trace and must maintain a setback, typically at least 50 feet.4California Department of Conservation. Alquist-Priolo Earthquake Fault Zones Buyers planning additions or rebuilds need to know before closing.
What Happens If a Seller Fails to Disclose
A failed disclosure does not undo the sale. Section 1103.13 provides that no covered transfer is invalidated solely because someone failed to comply with the disclosure requirements.11California Legislative Information. California Code CIV 1103.13 The buyer still owns the house.
What the buyer gets is a claim for actual damages. Any person who willfully or negligently fails to perform a duty under the Act is liable for the actual damages the buyer suffers as a result.11California Legislative Information. California Code CIV 1103.13 In practice, that usually means the difference between what the buyer paid and what the property was actually worth given the undisclosed hazard, plus consequential costs like retroactive insurance premiums or repairs. A buyer who learns after closing that the home sits in a flood zone and has to buy NFIP coverage has a concrete, calculable loss.
The limitations period for property damage claims, including fraud, is generally three years from the date the buyer discovered or should have discovered the problem.12California Courts. Statute of Limitations A breach-of-contract claim on the written purchase agreement runs four years. Under the discovery rule, a buyer who had no reason to know about a hazard until a flood or earthquake reveals it may see the clock start from that event rather than from closing.
Sellers who used a qualified third-party report and exercised ordinary care in relying on it are protected from liability for errors in that report under Section 1103.4.7California Legislative Information. California Civil Code CIV 1103.4 Sellers who skipped the form or filled it in without checking the maps have no such shield. Set against the cost of a report, the math is not close.