Johnson County, TN
FEMA National Risk Index scores, disaster declarations & hazard data
Johnson County has experienced 20 federally declared disasters since 1973, most recently Severe Winter Storm in 2026. Its overall natural hazard risk is rated Very Low — among the lowest-risk counties in the country.
Johnson County's highest-rated hazards are landslide, cold wave, and wildfire, with its top risk rated "Relatively Moderate" by FEMA's National Risk Index.
Past disasters & FEMA designations
A federal disaster declaration officially designates a county for FEMA disaster assistance. Johnson County has been designated in 20 declarations since 1973, covering 8 disaster types including severe storm (7), flood (4), winter storm (2).
| Year | Type | Event name |
|---|---|---|
| 2026 | Winter Storm | Severe Winter Storm |
| 2026 | Winter Storm | Severe Winter Storm |
| 2025 | Tropical Storm | Tropical Storm Helene |
| 2025 | Severe Storm | Severe Storms, Straight-Line Winds, Tornadoes, And Flooding |
| 2024 | Tropical Storm | Tropical Storm Helene |
| 2023 | Severe Storm | Severe Storms, Straight-Line Winds, And Tornadoes |
| 2020 | Biological | Covid-19 Pandemic |
| 2020 | Biological | Covid-19 |
| 2019 | Flood | Severe Storms, Flooding, Landslides, And Mudslides |
| 2011 | Severe Storm | Severe Storms, Tornadoes, Straight-Line Winds, And Associated Flooding |
Showing the 10 most recent of 20 total declarations since 1973.
Source: FEMA OpenFEMA Disaster Declarations Summaries. A single disaster can produce more than one record per county. Data current through September 2026.
Risk by hazard type
| Hazard | Risk rating | Risk score | Recorded events | Deaths | Prop. damage |
|---|---|---|---|---|---|
| Wildfire | Very Low | 54.9 | 0 | 0 | — |
| Inland Flooding | Relatively Low | 47.2 | 7 | 1 | $7.4M |
| Coastal Flooding | Not Applicable | — | 0 | 0 | — |
| Earthquake | Very Low | 46.9 | — | — | — |
| Heat Wave | Very Low | 2 | 0 | 0 | — |
| Tornado | Very Low | 25.4 | 1 | 0 | — |
| Hurricane | Very Low | 51.1 | 0 | 0 | — |
| Hail | Very Low | 14 | 0 | 0 | — |
| Strong Wind | Relatively Low | 36.2 | 0 | 0 | — |
| Winter Weather | Relatively Low | 30 | 0 | 0 | — |
| Ice Storm | Relatively Low | 37.3 | — | — | — |
| Cold Wave | Relatively Low | 63 | — | — | — |
| Lightning | Relatively Low | 48 | 0 | 0 | — |
| Drought | Relatively Low | 47.8 | 0 | 0 | — |
| Landslide | Relatively Moderate | 90.7 | 0 | 0 | — |
| Avalanche | Not Applicable | — | — | — | — |
| Tsunami | Not Applicable | — | — | — | — |
| Volcanic Activity | Not Applicable | — | — | — | — |
Scores are 0–100 percentiles relative to all US counties — higher means more exposed, not that a disaster is likely this year. Event counts: NOAA Storm Events 2016–2026; earthquake counts from USGS ComCat (M3.0+, 1996–2026). See the methodology page for details.
Community vulnerability
Johnson County ranks in the 69th percentile (Moderate) for community vulnerability — a measure of how hard disaster impacts tend to hit residents. Higher vulnerability means more displacement, worse health outcomes, and slower recovery after a disaster.
| SVI theme | Percentile | Vulnerability level |
|---|---|---|
| Overall | 69th | Moderate |
| Socioeconomic status | 69th | Moderate |
| Household characteristics | 42nd | Low |
| Racial & ethnic minority status | 27th | Low |
| Housing type & transportation | 89th | High |
Source: CDC/ATSDR Social Vulnerability Index 2022. Percentiles compare counties nationally — higher means more vulnerable relative to other counties. See CDC SVI for full methodology.
Future risk outlook
| Wildfire metric | National percentile | Level |
|---|---|---|
| Burn probability | 70th | Relatively High |
| Risk to homes | 67th | Relatively High |
| Buildings in direct exposure zone | 95.4% | — |
Wildfire: USDA Forest Service Wildfire Risk to Communities (RDS-2020-0016-2) — modeled values, not annual forecasts. See wildfirerisk.org. Inland flood and heat projections pending data availability; coastal sea-level projections are available for select coastal counties below — see the data page.
Nearby counties
Frequently asked questions
What natural hazards pose the greatest risk in Johnson County?
According to the FEMA National Risk Index, the highest-risk hazards in Johnson County, Tennessee are landslide, cold wave, and wildfire. The county's overall natural hazard risk is rated Very Low — among the lowest-risk counties in the country.
Has Johnson County received federal disaster declarations?
Yes. Johnson County has received 20 federal disaster declarations since 1973, including declarations in 2026. The most common disaster type on record is severe storm (7 declarations).
Has Johnson County had any FEMA disaster declarations in 2024, 2025, or 2026?
Yes. Recent federal disaster declarations for Johnson County include Severe Winter Storm (2026), Severe Winter Storm (2026), Tropical Storm Helene (2025), Severe Storms, Straight-Line Winds, Tornadoes, And Flooding (2025), Tropical Storm Helene (2024). See the declarations table above for the full history since 1973.
How does Johnson County's natural hazard risk compare to nearby counties?
Among neighboring counties, Watauga County, NC has the highest overall natural hazard risk (Relatively Low) and Bristol, VA has the lowest (Very Low). Johnson County is rated Very Low overall.
How is Johnson County's composite disaster risk index calculated?
Johnson County's composite disaster risk index — officially FEMA's National Risk Index (NRI) — scores every US county on a 0–100 percentile scale across 18 natural hazard types, factoring in expected annual loss, social vulnerability, and community resilience. Johnson County's composite score of 28 means its overall natural hazard risk is higher than 28% of US counties.