Orange County, California
Natural disaster risk, federal disaster history and flood insurance facts.
Orange County, California has a very high overall risk from natural hazards in FEMA's National Risk Index. Its risk score is in the top 1% of US counties. It ranks 4th of 58 counties in California. The costliest hazards here are earthquakes, inland flooding and wildfires. FEMA estimates about $1.9 billion a year in expected losses, or roughly $605 per resident. Since 1969 it has been included in 40 federal disaster or emergency declarations for natural events (23 major disasters). The most recent was in October 2026 (Norte Fire). About 1 in 100 homes here carry federal flood insurance (7,994 policies). Since 1978, federal flood insurance has paid about $21 million on 3,839 claims here.
FEMA National Risk Index December 2025; OpenFEMA declarations to Nov 6, 2026; NFIP records. Updated November 6, 2026.
Top risks in Orange County
- Ask whether an older house is bolted to its foundation.
- Consider separate earthquake insurance where risk is high.
- Check the FEMA flood map for your address, and ask the seller or landlord about past flooding.
- Price a flood policy now. Most new federal policies take 30 days to start.
- Clear dry plants and debris within 5 feet of the house.
- Get home insurance quotes early; availability varies by area.
All 18 hazards
What the ratings mean ›| Hazard | Rating | Score | Expected loss a year | |
|---|---|---|---|---|
| Earthquake | 99.9 | $1B | ||
| Inland flooding | 99.8 | $820M | ||
| Wildfire | 99.8 | $58M | ||
| Heat wave | 97.2 | $11M | ||
| Coastal flooding | 92.0 | $8M | ||
| Tornado | 83.7 | $5M | ||
| Landslide | 99.7 | $4M | ||
| Tsunami | 56.9 | $3M | ||
| Hail | 79.5 | $937K | ||
| Strong wind | 52.3 | $653K | ||
| Lightning | 66.9 | $489K | ||
| Drought | 32.7 | $37K | ||
| Winter weather | 1.3 | $133 | ||
| Avalanche | 13.7 | $16 |
Scores are percentiles: a score of 90 means higher risk than about 90% of US counties for that hazard. Hazards FEMA does not rate here are left out. Social vulnerability is relatively low and community resilience is very low in FEMA's measures.
Federal disaster history
Recent disasters nationwide ›Declarations by decade
Federal declarations for natural events that included Orange County. 2020s bar runs to November 2026.
By type
Most recent
Show all 40
California also had 35 statewide declarations that did not name single counties.
Storm history since 1958
Tornado risk by county ›The National Weather Service has logged 355 storm reports in Orange County since 1958, with 17 deaths and 68 injuries and about $163 million in reported damage. The strongest on record here was an F3 tornado on February 9, 1978.
Strongest tornadoes
| Date | Strength | Near | Hurt / killed |
|---|---|---|---|
| Feb 9, 1978 | F3 | – | 6 / 0 |
| Nov 7, 1966 | F2 | – | 0 / 0 |
| Mar 16, 1977 | F1 | – | 4 / 0 |
| Mar 16, 1986 | F1 | – | 0 / 0 |
| Jan 19, 2010 | EF1 | Seal Beach | 0 / 0 |
Most damaging storms
| Date | Type | Near | Damage |
|---|---|---|---|
| Dec 19, 2010 | Flood | San Clemente | $36M |
| Feb 23, 1998 | Flash Flood | Countywide | $30M |
| Feb 18, 2005 | Heavy Rain | Huntington Beach | $20M |
| Dec 6, 1997 | Flash Flood | Central Portion | $18M |
| Jan 7, 2005 | Heavy Rain | Fullerton | $15M |
| Dec 22, 2010 | Flash Flood | Emerald Bay | $12M |
Source: NOAA Storm Events Database, county-based reports through Feb 18, 2026. Tornado records start in 1950, hail and wind in 1955, and floods and other storm types in 1996, so older decades undercount. Damage is in dollars of the year it happened and is often an estimate. Winter storms, heat and hurricanes are logged by forecast zone, not county, so they are not counted here.
Flood insurance in Orange County
Check your address flood zone ›National Flood Insurance Program (NFIP) records only; private flood policies are not included. Home counts as of Aug 3, 2026. Since 2021 NFIP prices each home separately under Risk Rating 2.0, so your price depends on the building, not the county. Ask an agent for a quote.
Homes in Orange County
Older homes and mobile homes usually suffer more damage in storms, floods and earthquakes, and can cost more to insure. If you are buying, ask about roof age, foundation bolting and any retrofits. Source: US Census Bureau, American Community Survey 2020 to 2024 5-year estimates; 1,146,169 housing units.
Compare in California
All 58 ›| Largest counties | Overall risk | Top hazard |
|---|---|---|
| Los Angeles County | Earthquake | |
| San Diego County | Inland flooding | |
| Orange County | Earthquake | |
| Riverside County | Inland flooding | |
| San Bernardino County | Inland flooding | |
| Santa Clara County | Earthquake | |
| Alameda County | Earthquake | |
| Sacramento County | Inland flooding |
Neighboring counties
| County | Overall risk | Declarations |
|---|---|---|
| Los Angeles County | 86 | |
| San Diego County | 49 | |
| Riverside County | 64 | |
| San Bernardino County | 59 |
Common questions about Orange County
What is the biggest natural hazard in Orange County?
Earthquake has the highest expected yearly losses in Orange County, about $1 billion a year in FEMA's estimate. Inland flooding is second at $820 million.
How many federal disasters has Orange County had?
Orange County has been included in 40 federal disaster or emergency declarations for natural events since 1969, including 23 major disasters. The most recent was Norte Fire in October 2026.
Is Orange County a high-risk place to live?
Its overall rating is Very High, 4th highest of 58 in California. A county rating covers the whole area. Risk at one address can be much higher or lower, so check the FEMA flood map and ask about the home's history.
Do I need flood insurance in Orange County?
Standard home insurance does not cover flooding. About 1 in 100 homes in Orange County has federal flood insurance. Lenders require it in mapped high-risk zones, but many flood claims come from outside those zones.
How many tornadoes has Orange County had?
NOAA records list 31 tornadoes in Orange County since 1950. The strongest was an F3 tornado on February 9, 1978. The weather service has also logged 13 hail reports and 138 floods here.
Sources: FEMA National Risk Index (December 2025), OpenFEMA Disaster Declarations Summaries, and NFIP policy and claims data. Hazard Compass is independent and not affiliated with FEMA. These figures describe the whole county, not a single property, and are not insurance or safety advice. Report a problem.