Napa County, CA
FEMA National Risk Index scores, disaster declarations & hazard data
Napa County has experienced 39 federally declared disasters since 1965, most recently Severe Winter Storms, Flooding, And Mudslides in 2023. Its overall natural hazard risk is rated Relatively High — higher risk than most US counties.
Napa County's highest-rated hazards are drought, landslide, and earthquake, with its top risk rated "Very High" by FEMA's National Risk Index. Recorded storm events have decreased 83% over the past five years compared to the prior five-year period.
Past disasters & FEMA designations
A federal disaster declaration officially designates a county for FEMA disaster assistance. Napa County has been designated in 39 declarations since 1965, covering 9 disaster types including fire (13), severe storm (10), flood (8).
| Year | Type | Event name |
|---|---|---|
| 2023 | Severe Storm | Severe Winter Storms, Straight-Line Winds, Flooding, Landslides, And Mudslides |
| 2023 | Flood | Severe Winter Storms, Flooding, Landslides, And Mudslides |
| 2023 | Flood | Severe Winter Storms, Flooding, Landslides, And Mudslides |
| 2023 | Flood | Severe Winter Storms, Flooding, And Mudslides |
| 2021 | Fire | Wildfires |
| 2020 | Fire | Wildfires |
| 2020 | Fire | Lnu Lightning Fire Complex |
| 2020 | Fire | Glass Fire |
| 2020 | Biological | Covid-19 Pandemic |
| 2020 | Biological | Covid-19 |
Showing the 10 most recent of 39 total declarations since 1965.
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 | Relatively Moderate | 96 | 0 | 0 | — |
| Inland Flooding | Relatively High | 95.8 | 29 | 0 | $20 |
| Coastal Flooding | Relatively Moderate | 68.2 | 0 | 0 | — |
| Earthquake | Relatively High | 98.4 | 46 | — | — |
| Heat Wave | Relatively Low | 66.8 | 1 | 0 | — |
| Tornado | Very Low | 18.3 | 1 | 0 | — |
| Hurricane | Not Applicable | — | 0 | 0 | — |
| Hail | Very Low | 8.5 | 1 | 0 | — |
| Strong Wind | Very Low | 8.3 | 0 | 0 | — |
| Winter Weather | Very Low | 4.2 | 0 | 0 | — |
| Ice Storm | Not Applicable | — | — | — | — |
| Cold Wave | No Rating | 0 | — | — | — |
| Lightning | Relatively Low | 30.2 | 1 | 0 | — |
| Drought | Very High | 99.5 | 0 | 0 | — |
| Landslide | Relatively High | 98.7 | 19 | 0 | — |
| Avalanche | Very Low | 9.2 | — | — | — |
| Tsunami | Very Low | 3.1 | — | — | — |
| Volcanic Activity | Very Low | 60.3 | — | — | — |
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
Napa County ranks in the 68th 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 | 68th | Moderate |
| Socioeconomic status | 50th | Moderate |
| Household characteristics | 41st | Low |
| Racial & ethnic minority status | 87th | High |
| Housing type & transportation | 87th | 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 | 95th | Very High |
| Risk to homes | 95th | Very High |
| Buildings in direct exposure zone | 25.7% | — |
NOAA tracked 49 weather events in this county over 2016–2025: 42 in 2016–20 vs 7 in 2021–25 (-83% — frequency decreasing).
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 Napa County?
According to the FEMA National Risk Index, the highest-risk hazards in Napa County, California are drought, landslide, and earthquake. The county's overall natural hazard risk is rated Relatively High — higher risk than most US counties.
Has Napa County received federal disaster declarations?
Yes. Napa County has received 39 federal disaster declarations since 1965, including declarations in 2023. The most common disaster type on record is fire (13 declarations).
Has Napa County had any FEMA disaster declarations in 2024, 2025, or 2026?
No federal disaster declarations have been recorded for Napa County since the start of 2024. Its most recent declaration on record is Severe Winter Storms, Flooding, And Mudslides in 2023.
How does Napa County's natural hazard risk compare to nearby counties?
Among neighboring counties, Contra Costa County, CA has the highest overall natural hazard risk (Very High) and Colusa County, CA has the lowest (Relatively Moderate). Napa County is rated Relatively High overall.
How is Napa County's composite disaster risk index calculated?
Napa 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. Napa County's composite score of 95 means its overall natural hazard risk is higher than 95% of US counties.