Earthquakes risk in Delaware

What a Delaware earthquake actually looks like

If you live in Wilmington, Dover, or down near Rehoboth Beach, your earthquake risk is not the same as California's. Delaware's statewide rating is 1 out of 5. The USGS National Seismic Hazard Maps put most of the state in a low-hazard zone. But low isn't none. The state has felt shaking from distant quakes and small local events. The Mineral, Virginia earthquake was felt across Delaware. I won't invent numbers here, but you get the point: the ground can move, even if it rarely does.

New Castle County, Kent County, and Sussex County all share the same basic story. The coastal communities along the Delaware Bay and the Atlantic—Lewes, Cape Henlopen, Bethany Beach, Fenwick Island—have sandy soils that can amplify shaking in some conditions. Inland, around Newark and Middletown, you have more older housing stock and masonry chimneys. That's where a rare quake could do its most annoying damage.

What actually happens to a house

Most Delaware earthquake damage would not look like a Hollywood collapse. It would look like cracked drywall, a chimney that shifts, a foundation crack that widens, or a water heater that tips over and starts a gas leak. Unreinforced brick chimneys are a classic weak point. So are homes built before modern seismic codes—and Delaware doesn't have the aggressive seismic retrofit culture you see in California.

Contents cause a lot of the injury and loss. Bookcases, televisions, mirrors, kitchen cabinets, and garage shelving can all become projectiles. If a quake happens while you're sleeping, the biggest risk may be broken glass and blocked exits. If it happens while you're at work in Wilmington or Dover, it's the commute home over bridges and overpasses that can get complicated.

Delaware also has liquefaction-prone areas near waterways. That's not a reason to panic. It is a reason to know whether your particular lot is on fill or near a marsh. The Delaware Emergency Management Agency and county planning offices can help you check local conditions.

If you only do three things

With limited time and money, I'd spend a Saturday on these, in this order:

1. Secure the water heater. Strap it to wall studs with a proper earthquake strap kit. A tipped water heater can start a fire or flood a basement.
2. Anchor tall furniture. Bookcases, dressers, and TVs. Use L-brackets into studs. Museum putty for small objects. It's cheap and it works.
3. Know how to shut off gas and water. Show everyone in the house. Keep a wrench near the meter. If you smell gas after a quake, leave and call the utility from outside.

If you have more budget, get a licensed engineer to look at your chimney and foundation. That's especially true for older homes in Wilmington, Dover, or older parts of Sussex County. A chimney brace and a foundation retrofit can cost real money, but they address the most common earthquake damage in this region.

Insurance gaps people miss

Here's the part that surprises people. Your standard homeowners policy typically does not cover earthquake damage. In Delaware, earthquake coverage is usually an optional endorsement or a separate policy. Some insurers offer it; some don't. Deductibles are often a percentage of your home's insured value—sometimes 2% to 10%—not a flat $500. Read the actual policy language or ask your agent for it in writing.

Flood is also excluded from standard homeowners policies. That matters after any event that involves water, including a quake that breaks a pipe or cracks a foundation. Flood insurance comes through FEMA's National Flood Insurance Program or a private carrier. Check FloodSmart and your county flood maps.

Hurricanes add another split. Wind damage is usually covered under your homeowners policy; storm surge and flooding are not. If a hurricane or nor'easter hits Sussex County or the Delaware Bay coast, you may need to file two claims through two different policies. That's a paperwork headache, not a reason to skip coverage. Just know which policy pays for what before you need it.

Questions we get

Do I really need earthquake insurance in Delaware?

Probably not for most homeowners, given the low statewide risk. But if you own an older masonry home, have a high deductible you could cover, or just want the peace of mind, get a quote. Compare the premium against the cost of repairing a chimney or foundation crack on your own.

What should I do during an earthquake in Delaware?

Drop, cover, and hold on. Get under a sturdy table and protect your head and neck. Stay away from windows and chimneys. If you're outside, move away from buildings and power lines. If you're driving, pull over away from bridges and overpasses and stay in the car.

Which Delaware counties have the highest earthquake risk?

All three counties—New Castle, Kent, and Sussex—are in the same low-hazard category. The difference is local: soft soils near the coast, older housing stock, and unreinforced masonry can make shaking worse in specific neighborhoods. Your address matters more than your county line.

Where to verify this

Don't take my word for it. Check the official sources. The Delaware Emergency Management Agency has state-specific preparedness info. USGS has the hazard maps and recent quake lists. Ready.gov and FEMA cover what to do before, during, and after.

• Delaware Emergency Management Agency
• USGS Earthquake Hazards Program
• Ready.gov – Earthquakes
• FEMA Earthquake Safety

One last thing. If you're buying a house in Delaware, ask the seller for any disclosure about foundation repairs, chimney work, or prior insurance claims. Then look at the USGS map for your address. Low risk still deserves a quick look.