Earthquakes risk in California

You get the keys to a house in Sacramento, and your agent hands you a homeowners policy. You flip to the exclusions. Earthquake. That's the moment most California buyers realize the ground itself is a separate line item.

The fault lines under your zip code

California is laced with faults. From Humboldt County down to the Imperial Valley, the ground can move. The San Andreas is the famous one, but it's not the only one that matters. In the San Francisco Bay Area, the Hayward and Calaveras faults run right under dense neighborhoods. Los Angeles County sits near the San Andreas and a web of smaller faults, like the Newport-Inglewood. The 1994 Northridge earthquake showed how much damage a blind thrust fault can do—even one that wasn't on the main map.

Coastal towns from Mendocino to Santa Cruz have both fault and tsunami risk. Inland, the risk doesn't disappear. Riverside, San Bernardino, and Kern counties all have active faults. The USGS shakes the whole state in its hazard models.

What actually happens to a house

During strong shaking, a house moves in ways it was never designed to. Older homes that aren't bolted to their foundation can slide off. Chimneys crack and fall. Unreinforced masonry—brick buildings built before the 1930s—can crumble. Even newer homes can suffer cracked foundations, broken windows, and ruptured gas lines.

The damage isn't always total. A lot of it is repairable. But the bill can be huge, and that's where insurance comes in—or doesn't.

If you only do three things

If I had one weekend and a few hundred bucks, I'd start with the water heater. Secure it with two straps. If it tips, it can break gas lines and start a fire. Second, anchor tall furniture and bookcases to wall studs. Third, know how to shut off your gas. Keep a wrench near the meter. That's it. Those three steps cost less than a nice dinner and can prevent a lot of damage.

If you own an older home, a bolt-and-brace retrofit is the highest-value upgrade you can make. It anchors the house to the foundation. In many California counties, you can get a property tax break for doing it.

Questions we get

Does my California homeowners policy cover earthquake damage?

Almost never. Standard homeowners policies exclude earthquake. You need a separate policy or an endorsement. The California Earthquake Authority is the largest provider, but many homeowners skip it because of the deductible—typically a percentage of your home's value, not a flat dollar amount. Flood damage is also excluded from standard policies; you buy that separately through the National Flood Insurance Program or a private insurer.

How do I find out if my house is near a fault?

Start with the USGS Earthquake Hazards Program. They have interactive maps that show fault lines and shake potential. Your county's Office of Emergency Services also publishes hazard mitigation plans. The California Governor's Office of Emergency Services has statewide resources.

What about flood damage after an earthquake?

Earthquake-caused flooding—like from a broken dam or a tsunami—is often excluded from both flood and earthquake policies. You'd need specific coverage for that, and it's rare. Check your policy language carefully.

Where to verify this

Don't take my word for it. These are the official sources:

• California Governor's Office of Emergency Services
• USGS Earthquake Hazards Program
• Ready.gov – Earthquakes
• FEMA Earthquake Safety

If you're buying a home in California, ask for the natural hazard disclosure. It will tell you if you're in a fault zone or flood zone. Then talk to your agent about what's actually covered. The ground here is a risk, but it's not a mystery. You can prepare for it.