Natural disaster risk in Johnson County, Tennessee
Tennessee · population 17,932 · FIPS 47091
Overall: very low risk
Johnson County has a composite risk score of 28.2 out of 100 — higher than 28% of US counties. It ranks 75 of 95 in Tennessee (1 = highest risk). Its highest-rated hazards are landslide, cold wave, lightning.
Drought now: No, but abnormally dry (D0)
No drought, but abnormally dry. On the U.S. Drought Monitor map valid 13 October 2026, 98.85% of Johnson County is D0 Abnormally Dry and none of it is in drought (D1 to D4). Some of it has been abnormally dry or worse for at least 54 weeks in a row.
Drought in Johnson County: the last 52 weeks · droughtmonitor.unl.edu
The U.S. Drought Monitor is jointly produced by the National Drought Mitigation Center at the University of Nebraska-Lincoln, the United States Department of Agriculture, the National Oceanic and Atmospheric Administration and the National Aeronautics and Space Administration. Map courtesy of NDMC.
Risk, loss, vulnerability and resilience
| Measure | Rating and score |
|---|---|
| Overall risk Expected annual loss, adjusted for social vulnerability and community resilience. |
Very low 28.2 |
| Expected annual loss About $5.9 million a year, on average, across all 18 hazards. |
Very low 16.6 |
| Social vulnerability Higher means people may find it harder to prepare and recover. |
Very high 88.8 |
| Community resilience Higher means a stronger ability to prepare, adapt and recover. |
Very low 6.6 |
Risk by hazard
FEMA's risk rating for each of 18 natural hazards in Johnson County, highest first. "Not applicable" means the hazard is not modelled here.
| Hazard | Risk rating and score |
|---|---|
| Landslide | Relatively moderate 90 |
| Cold wave | Relatively low 63 |
| Lightning | Relatively low 48 |
| Drought | Relatively low 47 |
| Inland (riverine) flooding | Relatively low 47 |
| Ice storm | Relatively low 37 |
| Strong wind | Relatively low 36 |
| Winter weather | Relatively low 29 |
| Wildfire | Very low 54 |
| Hurricane | Very low 51 |
| Earthquake | Very low 46 |
| Tornado | Very low 25 |
| Hail | Very low 14 |
| Heat wave | Very low 1 |
| Avalanche | Not applicable |
| Coastal flooding | Not applicable |
| Tsunami | Not applicable |
| Volcanic activity | Not applicable |
FEMA disaster declarations for Johnson County
Federal declarations that designated Johnson County, since 1 Jan 2024 (the period this site keeps from OpenFEMA). Older declarations are in FEMA's own dataset.
Yes. Johnson County has been named in 5 FEMA declarations since 1 Jan 2024. The latest is DR-4898-TN (Severe Winter Storm), declared 6 Feb 2026.
| Declaration | Kind | Incident | Declared | Individual assistance here |
|---|---|---|---|---|
| DR-4898-TN | Major disaster | Severe Winter Storm | 6 Feb 2026 | No |
| EM-3635-TN | Emergency | Severe Winter Storm | 24 Jan 2026 | No |
| EM-3625-TN | Emergency | Severe Storms, Straight-Line Winds, Tornadoes, and Flooding | 2 Apr 2025 | No |
| DR-4832-TN | Major disaster | Tropical Storm Helene | 2 Oct 2024 | Yes |
| EM-3620-TN | Emergency | Tropical Storm Helene | 27 Sep 2024 | No |
All FEMA declarations in Tennessee, with estimated apply-by dates · Open FEMA deadlines
This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s). Dataset: Disaster Declarations Summaries - v2.
How to read these ratings
- Ratings run in five steps: very low, relatively low, relatively moderate, relatively high and very high. They compare a county with every other US county; they are not a measure of danger on their own.
- Scores run from 0 to 100 and are national percentiles. The bar shows the score: a score of 80 means a higher value than 80% of US counties.
- Overall risk combines the expected annual loss with social vulnerability and community resilience.
- Expected annual loss is the average yearly loss to buildings, people and agriculture the model expects from all 18 hazards.
- Social vulnerability describes how hard it may be for people to prepare for and recover from a disaster. Higher is worse.
- Community resilience describes a community's ability to prepare, adapt and recover. Higher is better.
- "Not applicable" means FEMA does not model that hazard there (for example, hurricanes far inland).
About this data
Source: FEMA National Risk Index, version 1.20, released December 2025, published by the Federal Emergency Management Agency (US public domain). About the National Risk Index. The index is a model of relative risk built from historical hazard records, what is exposed and community factors. It is not a forecast, it does not describe any single property, and it is not insurance or financial advice. For decisions about a specific address, check FEMA's flood maps and your local emergency management office.
Questions
What is the natural disaster risk in Johnson County, Tennessee?
FEMA's National Risk Index rates the overall risk in Johnson County as very low, with a score of 28.2 out of 100 (higher than 28% of US counties). That is a comparison with other US counties, not a forecast.
What are the biggest natural hazards in Johnson County?
The hazards rated highest for Johnson County are landslide (relatively moderate), cold wave (relatively low), lightning (relatively low).
What is the flood risk in Johnson County?
FEMA rates inland (river and rain) flooding risk in Johnson County as relatively low. For a specific property, check the FEMA flood map and your local floodplain office.
Has Johnson County had a FEMA disaster declaration?
Yes. Johnson County has been named in 5 FEMA declarations since 1 Jan 2024. The latest is DR-4898-TN (Severe Winter Storm), declared 6 Feb 2026.
Is Johnson County in a drought?
No drought, but abnormally dry. On the U.S. Drought Monitor map valid 13 October 2026, 98.85% of Johnson County is D0 Abnormally Dry and none of it is in drought (D1 to D4). Some of it has been abnormally dry or worse for at least 54 weeks in a row.
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