riskbycounty
FEMA NRI 1.19.0Updated Nov 2023 · Coverage 2014–2023Methodology

Stanislaus County Disaster Risk

Stanislaus County, California

FEMA Risk Rating

Relatively High

National Percentile

97th

of 3,144 counties

State Rank

#22

of 58 (1 = highest risk)

Flood Risk

96th

percentile

Hazard Risk Breakdown

Flood

River, coastal, and surface flooding risk

Relatively High

Higher than 96% of US counties

Wildfire

Wildland and wildland-urban interface fire risk

Relatively High

Higher than 95% of US counties

Tornado

Tornado and severe thunderstorm risk

Very Low

Higher than 28% of US counties

Earthquake

Seismic activity and ground shaking risk

Relatively High

Higher than 99% of US counties

Risk Overview

About Natural Disaster Risk in Stanislaus County, California

Stanislaus carries above-average national risk

Stanislaus County's composite risk score of 96.88 places it well into the Relatively High category nationally. This score reflects significant exposure to multiple overlapping hazards across the county.

Third-highest risk in Central Valley

Stanislaus scores 96.88—well above California's 88.72 state average—ranking it among the state's top five riskiest counties. The county faces notably higher earthquake risk (98.54) than most of its peers.

Riskier than Merced, comparable to Tuolumne

Stanislaus's 96.88 score exceeds Merced County's risk profile but sits slightly below Tulare County's 97.04. All three Central Valley counties share elevated flood and earthquake vulnerabilities.

Earthquakes, floods, and wildfires converge

Earthquake risk (98.54), flood risk (95.96), and wildfire risk (95.04) all exceed state averages in Stanislaus. The county's agricultural base and aging infrastructure compound flood dangers in particular.

Bundle earthquake, flood, wildfire coverage

Your homeowners policy covers none of your three biggest hazards; you must buy earthquake and flood insurance separately. Wildfire-specific coverage varies by insurer—verify your policy includes wildland-urban interface protections.

Source: FEMA National Risk Index · Narrative reviewed by Evan Brooks, Data Editor

Preparedness Guide

What to Prepare for in Stanislaus County

Top Hazards by Exposure

  1. #1
    EarthquakePrepare
    99th percentile
  2. #2
    FloodPrepare
    96th percentile
  3. #3
    WildfirePrepare
    95th percentile

Source: FEMA National Risk Index v1.19.0 · Percentiles are national (3,144 counties)

Local Resources

Risk Advisory: Stanislaus County

Risk Verdict

Stanislaus County ranks in the top tier for natural disaster risk nationally, with a composite score at the 97th percentile. Comprehensive household preparedness — including reviewing insurance, maintaining emergency supplies, and knowing evacuation routes — is strongly recommended.

Hazard Breakdown

Earthquake risk is Stanislaus County's dominant natural hazard, ranked at the 99th percentile nationally under FEMA's National Risk Index. Flood ranks second at the 96th percentile nationally. Additional tracked hazards include wildfire (95th percentile), tornado (28th percentile).

Preparedness Context

Stanislaus County ranks at the 99th percentile nationally for earthquake risk. Unlike most natural hazards, earthquakes provide no advance warning; preparedness here means structural adjustments and a practiced response, not alert monitoring. Alongside earthquake exposure, Stanislaus County's flood risk at the 96th percentile nationally reinforces the value of maintaining a household emergency supply cache usable for multiple hazard scenarios. For earthquake preparedness, Stanislaus County's county emergency management office often maintains a list of community water supply points, Red Cross shelter locations, and post-quake assistance programs — useful resources to identify before an event occurs.

Regional Context

Compared to other California counties, Stanislaus County runs 8.2 composite risk points higher than the state mean — reflecting above-average hazard concentration in this area.

Is your household prepared for Stanislaus County's hazards?

Review FEMA's county-specific preparedness checklists and emergency planning guides.

FEMA Ready Guide →

Frequently Asked Questions

What is the natural disaster risk in Stanislaus County, CA?
Stanislaus County has a FEMA National Risk Index rating of Relatively High, placing it in the 97th percentile nationally out of 3,144 counties. This composite score reflects the county's overall exposure to natural hazards including floods, wildfires, tornadoes, earthquakes, and hurricanes, weighted by expected annual loss and social vulnerability.
What types of natural hazards affect Stanislaus County?
Stanislaus County is evaluated for five major natural hazard types: earthquake (99th percentile), flooding (96th percentile), wildfire (95th percentile), tornado (28th percentile). The highest-risk hazard is earthquake at the 99th percentile nationally. These scores are derived from FEMA's National Risk Index, which analyzes expected annual loss, social vulnerability, and community resilience for each hazard type.
How does Stanislaus County risk compare to the California average?
Stanislaus County's composite risk percentile is 97th, compared to the California state average of 89th percentile. The state's overall risk rating is Relatively Moderate. This means Stanislaus County faces higher natural disaster risk than the typical county in California.
Is Stanislaus County at risk for earthquake?
Yes, Stanislaus County's earthquake risk is at the 99th percentile nationally. This places it in the top quartile for this hazard type. For flooding specifically, Stanislaus County is at the 96th percentile.
How is natural disaster risk measured?
FEMA's National Risk Index (NRI) calculates risk scores for 18 natural hazard types across all U.S. counties and census tracts. The composite score combines Expected Annual Loss (estimated dollar losses from each hazard), Social Vulnerability (demographic factors affecting disaster impact), and Community Resilience (ability to recover). Percentile scores rank each county against all 3,144 U.S. counties, and risk ratings range from Very Low to Very High.
Why is Stanislaus County higher risk than average?
Stanislaus County's composite risk score of 97th percentile is above the California state average of 89th percentile. This elevated risk is driven by earthquake exposure (99th percentile), along with flooding and wildfire risk. Geographic location, terrain, climate patterns, and proximity to flood zones or fault lines all influence a county's risk profile.

Counties with Similar Risk

Merced County

California

-0.0

Relatively High

97th percentile

Solano County

California

+0.1

Relatively High

97th percentile

Humboldt County

California

-0.1

Relatively High

97th percentile

By Evan Brooks, Data EditorUpdated Reviewed by Evan Brooks, Data Editor

Data Source

Risk data sourced from the FEMA National Risk Index (NRI). Risk scores are relative rankings (0–100) across all US counties — not absolute risk measures. Higher scores indicate higher relative risk compared to other counties.

Disclaimer: This data is informational only. It is not financial, insurance, or legal advice. Always consult a qualified professional before making insurance or real estate decisions.

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