Earthquake Insurance: Who Needs It, What It Costs, and How Deductibles Work

Another Major Exclusion

Like floods, earthquakes are specifically excluded from standard homeowners policies. If an earthquake damages your home — cracked foundation, collapsed chimney, broken gas lines, structural shifting — your standard policy pays nothing. Earthquake coverage must be purchased separately as a standalone policy or endorsement.

Who Is at Risk

California gets the most attention, but significant seismic zones exist throughout the western US, along the New Madrid fault zone in the central states (Missouri, Tennessee, Arkansas, Kentucky, Illinois, Indiana), in the Pacific Northwest (Cascadia Subduction Zone), in parts of South Carolina, and in Oklahoma where induced seismicity from wastewater injection has dramatically increased earthquake frequency.

The USGS National Seismic Hazard Map shows earthquake risk nationwide. Areas with moderate to high risk include far more than the West Coast. If you are in or near any identified seismic zone, earthquake insurance deserves serious consideration.

The Percentage Deductible

The most notable feature of earthquake insurance is the deductible structure. Instead of a flat dollar amount, earthquake deductibles are typically 5 to 25 percent of dwelling coverage. On a $400,000 home, a 15 percent deductible means you pay the first $60,000 out of pocket. A 5 percent deductible means $20,000 out of pocket. These are enormous compared to standard homeowners deductibles.

This structure means earthquake insurance effectively covers only major events causing damage exceeding tens of thousands of dollars. Minor cracking and cosmetic damage falls entirely on the homeowner. The insurance is catastrophic protection, not maintenance coverage.

Cost Factors

Premiums range from $200 to $5,000+ annually depending on proximity to fault lines, construction type, building age, foundation type, number of stories, and chosen deductible. Wood-frame homes perform better in earthquakes and cost less to insure. Homes bolted to foundations, retrofitted with cripple wall bracing, or built to modern seismic codes get better rates. Single-story homes cost less than multi-story.

Higher deductibles significantly reduce premiums. Moving from 5 to 15 percent can cut the premium 30 to 50 percent. If you can handle moderate damage out of pocket and want protection only against catastrophic loss, the higher deductible with lower premium is a reasonable approach.

Retrofitting for Lower Premiums

Seismic retrofitting — bolting house to foundation, bracing cripple walls, securing water heaters and chimneys — reduces both risk and premiums. In California, the CEA Brace and Bolt program provides grants up to $3,000 for eligible homeowners. Basic retrofitting costs $3,000 to $7,000 for a standard wood-frame home. Insurance premium reductions of 5 to 20 percent annually plus the physical protection make retrofitting a strong investment in any seismically active area.