Johnson County, Georgia Natural Disaster Risk
FEMA National Risk Index assessment · GA
Very LowComposite Risk Score
National percentile: 9th
Johnson County faces very low composite natural disaster risk (NRI Risk Index score 9.3, 9th national percentile), driven primarily by drought and hurricane exposure. Expected annual loss across all 18 hazard types is $3M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Risk Overview
Johnson County carries a very low composite natural disaster risk, with a National Risk Index score of 9.3 out of 100 — placing it in the 9th national percentile and among the lowest-risk counties in the country. The score blends Expected Annual Loss, Social Vulnerability, and Community Resilience across all 18 FEMA hazard types.
The county's risk is driven primarily by drought (extended dry periods that stress water supplies and agriculture) at Medium risk — $567K in expected annual loss and about 43.42 events per year; hurricane (tropical cyclones bringing extreme wind, rain, and storm surge) at Low risk — $316K in expected annual loss and about 0.15 events per year; and earthquake (ground shaking from sudden movement along geologic faults) at Very Low risk — $184K in expected annual loss and about 0.00 events per year. Across all hazards, FEMA estimates $3M in expected annual loss for a population of 9K.
Beyond physical exposure, Johnson County has a very high social vulnerability rating (how susceptible the population is to harm) and a very low community resilience rating (its capacity to prepare for and recover from disasters). That combination — a more vulnerable population with limited resilience — can amplify the human cost of any given event.
The federal record bears this out: Johnson County has received 19 federal disaster declarations since 1977, including 7 for hurricane events and 2 for tropical storm events. The most recent was Severe Winter Storm (winter storm), declared in January 2026.
Among 159 Georgia counties, Johnson County ranks #133 for overall natural disaster risk.
Top Hazards
All 18 Hazard Risks
| Drought | Medium | 43.42 / yr | $567K |
| Hurricane | Low | 0.15 / yr | $316K |
| Earthquake | Very Low | 0.00 / yr | $184K |
| Heat Wave | Low | 7.79 / yr | $217K |
| Wildfire | Very Low | 0.00 / yr | $22K |
| Ice Storm | Low | 0.70 / yr | $22K |
| Tornado | Low | 0.14 / yr | $307K |
| Lightning | Low | 64.12 / yr | $65K |
| Hail | Very Low | 2.24 / yr | $45K |
| Strong Wind | Low | 1.78 / yr | $115K |
| Cold Wave | Very Low | 0.26 / yr | $54K |
| Riverine Flood | Very Low | 0.29 / yr | $878K |
| Landslide | Very Low | 0.05 / yr | $5 |
| Winter Weather | Very Low | 0.58 / yr | $1K |
| Avalanche | Very Low | 0.00 / yr | $0 |
| Coastal Flood | Very Low | 0.00 / yr | $0 |
| Tsunami | Very Low | 0.00 / yr | $0 |
| Volcanic Activity | Very Low | 0.00 / yr | $0 |
Disaster History
Johnson County has received 19 federal disaster declarations since 1977, most recently Severe Winter Storm in January 2026. Most frequent causes: Hurricane (7), Tropical Storm (2), Biological (2).
| Declared | Type | Disaster |
|---|---|---|
| January 2026 | Winter Storm | Severe Winter Storm |
| September 2024 | Hurricane | Hurricane Helene |
| September 2024 | Tropical Storm | Hurricane Helene |
| August 2024 | Tropical Storm | Hurricane Debby |
| March 2020 | Biological | Covid-19 Pandemic |
| March 2020 | Biological | Covid-19 |
| October 2018 | Hurricane | Hurricane Michael |
| October 2018 | Hurricane | Hurricane Michael |
| September 2017 | Hurricane | Hurricane Irma |
| September 2017 | Hurricane | Hurricane Irma |
Showing the 10 most recent of 19 declarations.
Source: FEMA Disaster Declarations Summaries (OpenFEMA).
Frequently Asked Questions
What is the overall natural disaster risk for Johnson County?
Johnson County has a composite FEMA National Risk Index score of 9.3 out of 100, placing it in the Very Low category and the 9th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Johnson County?
The three highest-rated hazards are Drought (Medium, $567K EAL), Hurricane (Low, $316K EAL), Earthquake (Very Low, $184K EAL). These account for most of the county's expected annual losses.
How does Johnson County compare to other Georgia counties?
Johnson County ranks #133 of 159 Georgia counties for overall natural disaster risk, with a very low rating.
How many federally declared disasters has Johnson County had?
FEMA records 19 federal disaster declarations for Johnson County since 1977, most often 7 for hurricane events and 2 for tropical storm events. The most recent was Severe Winter Storm, declared in January 2026.
What does Expected Annual Loss (EAL) mean?
EAL is FEMA's estimate of average annual dollar losses from natural hazards, calculated from historical event data and exposure models. Johnson County's $3M EAL is a statistical average, not a guarantee for any specific year or address.