Natural disaster risk in Loudoun County, Virginia
Virginia · population 418,601 · FIPS 51107
Overall: relatively low risk
Loudoun County has a composite risk score of 78.1 out of 100 — higher than 78% of US counties. It ranks 10 of 133 in Virginia (1 = highest risk). Its highest-rated hazards are winter weather, lightning, strong wind.
Drought now: No, but abnormally dry (D0)
No drought, but abnormally dry. On the U.S. Drought Monitor map valid 13 October 2026, 86.42% of Loudoun 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 Loudoun 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. |
Relatively low 78.1 |
| Expected annual loss About $60.7 million a year, on average, across all 18 hazards. |
Relatively moderate 86.4 |
| Social vulnerability Higher means people may find it harder to prepare and recover. |
Very low 10.6 |
| Community resilience Higher means a stronger ability to prepare, adapt and recover. |
Very high 85.5 |
Risk by hazard
FEMA's risk rating for each of 18 natural hazards in Loudoun County, highest first. "Not applicable" means the hazard is not modelled here.
| Hazard | Risk rating and score |
|---|---|
| Winter weather | Relatively high 90 |
| Lightning | Relatively high 87 |
| Strong wind | Relatively high 87 |
| Heat wave | Relatively moderate 91 |
| Inland (riverine) flooding | Relatively moderate 83 |
| Hail | Relatively moderate 76 |
| Drought | Relatively moderate 74 |
| Tornado | Relatively moderate 74 |
| Hurricane | Relatively low 80 |
| Earthquake | Relatively low 77 |
| Cold wave | Relatively low 24 |
| Landslide | Very low 51 |
| Wildfire | Very low 37 |
| Ice storm | Very low 26 |
| Avalanche | Very low 19 |
| Coastal flooding | Not applicable |
| Tsunami | Not applicable |
| Volcanic activity | Not applicable |
FEMA disaster declarations for Loudoun County
Federal declarations that designated Loudoun County, since 1 Jan 2024 (the period this site keeps from OpenFEMA). Older declarations are in FEMA's own dataset.
Yes. Loudoun County has been named in 1 FEMA declaration since 1 Jan 2024. The latest is EM-3631-VA (Severe Winter Storm), declared 23 Jan 2026.
| Declaration | Kind | Incident | Declared | Individual assistance here |
|---|---|---|---|---|
| EM-3631-VA | Emergency | Severe Winter Storm | 23 Jan 2026 | No |
All FEMA declarations in Virginia, 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 Loudoun County, Virginia?
FEMA's National Risk Index rates the overall risk in Loudoun County as relatively low, with a score of 78.1 out of 100 (higher than 78% of US counties). That is a comparison with other US counties, not a forecast.
What are the biggest natural hazards in Loudoun County?
The hazards rated highest for Loudoun County are winter weather (relatively high), lightning (relatively high), strong wind (relatively high).
What is the flood risk in Loudoun County?
FEMA rates inland (river and rain) flooding risk in Loudoun County as relatively moderate. For a specific property, check the FEMA flood map and your local floodplain office.
Has Loudoun County had a FEMA disaster declaration?
Yes. Loudoun County has been named in 1 FEMA declaration since 1 Jan 2024. The latest is EM-3631-VA (Severe Winter Storm), declared 23 Jan 2026.
Is Loudoun County in a drought?
No drought, but abnormally dry. On the U.S. Drought Monitor map valid 13 October 2026, 86.42% of Loudoun 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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