Which county in California has the highest natural disaster risk?

Los Angeles County has the highest natural disaster risk score in California at 100.0 (Very High), based on FEMA National Risk Index data.

Which county in California is the safest from natural disasters?

Alpine County has the lowest natural disaster risk score in California at 10.6 (Very Low), based on FEMA NRI data.

What natural disasters are most common in California?

California counties face varying levels of risk from floods, wildfires, tornadoes, earthquakes, and hurricanes. The FEMA National Risk Index scores each county across 18 hazard types. See individual county pages for detailed hazard breakdowns.

How is natural disaster risk measured by county?

The FEMA National Risk Index (NRI) measures natural disaster risk using expected annual loss, social vulnerability, and community resilience. Scores are normalized nationally, with ratings from Very Low to Very High across 18 natural hazard types.

California Disaster Risk

Natural disaster risk data for all 58 counties.

Avg Risk Score

88.7

Risk Rating

Very High

Counties with Data

of 58 total

Highest Risk Counties

Los Angeles County

100.0

Very High

Riverside County

99.9

Very High

San Bernardino County

99.8

Very High

Orange County

99.8

Very High

Alameda County

99.8

Very High

Lowest Risk Counties

Alpine County

10.6

Very Low

Sierra County

31.5

Very Low

Modoc County

39.7

Very Low

Mono County

46.5

Relatively Low

Lassen County

73.1

Relatively Low

All California Counties

County	Risk Score	Rating	Flood	Wildfire	Tornado	Earthquake
Los Angeles County	100.0	Very High	100.0	99.9	97.7	100.0
Riverside County	99.9	Very High	99.9	100.0	86.7	99.8
San Bernardino County	99.8	Very High	99.8	99.9	78.8	99.8
Orange County	99.8	Very High	99.8	99.8	83.7	99.9
Alameda County	99.8	Very High	99.7	97.7	65.8	100.0
Santa Clara County	99.7	Very High	99.8	97.4	55.8	99.9
San Diego County	99.7	Very High	99.7	100.0	64.4	99.7
San Francisco County	99.5	Very High	98.6	28.7	34.9	99.8
Contra Costa County	99.5	Very High	99.5	97.6	49.9	99.7
Ventura County	99.4	Relatively High	99.3	99.8	42.4	99.7
Fresno County	99.3	Relatively High	98.7	98.4	57.1	99.2
San Mateo County	99.2	Relatively High	98.4	92.0	30.6	99.7
Sonoma County	99.1	Relatively High	99.2	98.2	15.4	99.5
Santa Barbara County	99.0	Relatively High	98.6	99.2	5.4	99.4
Kern County	98.9	Relatively High	98.5	99.7	19.8	99.4
Monterey County	98.7	Relatively High	97.3	98.7	28.7	99.4
San Joaquin County	98.6	Relatively High	97.7	92.0	49.0	99.3
Sacramento County	98.1	Relatively High	99.0	95.9	65.0	98.9
Santa Cruz County	97.8	Relatively High	96.2	97.3	18.7	99.3
Tulare County	97.0	Relatively High	98.1	98.0	30.3	97.9
Solano County	97.0	Relatively High	97.4	94.5	34.1	99.0
Stanislaus County	96.9	Relatively High	96.0	95.0	27.8	98.5
Merced County	96.9	Relatively High	94.7	92.2	26.2	98.5
Humboldt County	96.8	Relatively High	94.2	95.5	7.9	99.0
Imperial County	96.5	Relatively High	94.1	76.0	11.4	99.2
Madera County	96.4	Relatively High	94.0	99.4	19.3	96.9
Marin County	96.4	Relatively High	97.2	94.6	18.6	98.7
San Luis Obispo County	95.9	Relatively High	96.7	98.3	6.1	97.9
Napa County	95.3	Relatively High	95.8	96.0	18.3	98.4
Del Norte County	94.4	Relatively High	77.8	85.7	3.3	94.2
Mendocino County	94.3	Relatively High	95.1	97.8	10.5	98.3
Butte County	93.9	Relatively Moderate	93.2	98.5	28.2	97.5
Shasta County	93.4	Relatively Moderate	94.8	99.5	15.4	96.5
Placer County	93.1	Relatively Moderate	95.8	98.7	23.3	95.2
Lake County	93.0	Relatively Moderate	94.1	99.1	10.9	97.0
Kings County	92.4	Relatively Moderate	87.7	77.1	16.4	97.0
El Dorado County	91.4	Relatively Moderate	91.7	99.7	13.7	91.6
Yolo County	91.4	Relatively Moderate	89.6	87.0	22.4	97.4
Nevada County	89.9	Relatively Moderate	89.9	99.4	17.9	92.1
Siskiyou County	89.0	Relatively Moderate	90.9	98.6	1.9	88.2
Tehama County	88.9	Relatively Moderate	90.0	98.5	12.9	94.3
Calaveras County	86.6	Relatively Moderate	77.6	99.5	8.0	76.7
Mariposa County	86.4	Relatively Moderate	70.8	99.0	6.4	67.5
Plumas County	86.4	Relatively Moderate	87.9	98.6	9.8	92.2
San Benito County	85.2	Relatively Moderate	69.4	95.4	10.2	97.3
Tuolumne County	85.2	Relatively Moderate	81.0	99.3	7.9	71.0
Sutter County	83.7	Relatively Moderate	71.4	77.1	14.9	94.1
Colusa County	81.1	Relatively Moderate	37.9	89.1	9.3	90.8
Yuba County	80.9	Relatively Low	83.8	96.8	14.9	90.1
Trinity County	79.5	Relatively Low	79.0	98.5	4.7	85.0
Inyo County	79.3	Relatively Low	61.6	83.7	2.9	94.3
Amador County	79.2	Relatively Low	70.0	98.1	6.0	64.5
Glenn County	74.4	Relatively Low	42.3	91.8	8.8	92.5
Lassen County	73.1	Relatively Low	74.4	97.5	3.2	89.7
Mono County	46.5	Relatively Low	46.9	91.2	2.5	89.0
Modoc County	39.7	Very Low	44.8	92.9	1.1	68.8
Sierra County	31.5	Very Low	37.7	95.6	2.4	66.8
Alpine County	10.6	Very Low	11.2	89.1	1.1	53.0

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