Natural disaster risk in Mason County, Washington
Washington · population 65,689 · FIPS 53045
Overall: relatively moderate risk
Mason County has a composite risk score of 85.3 out of 100 — higher than 85% of US counties. It ranks 20 of 39 in Washington (1 = highest risk). Its highest-rated hazards are landslide, earthquake, inland (riverine) flooding.
Drought now: Yes: D1 Moderate Drought, 14 weeks
Yes. On the U.S. Drought Monitor map valid 13 October 2026, 21.55% of Mason County is in D1 Moderate Drought. Some of it has been at D1 or worse for 14 weeks in a row.
Drought in Mason 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 moderate 85.3 |
| Expected annual loss About $44.3 million a year, on average, across all 18 hazards. |
Relatively low 81.7 |
| Social vulnerability Higher means people may find it harder to prepare and recover. |
Relatively high 70.5 |
| Community resilience Higher means a stronger ability to prepare, adapt and recover. |
Relatively low 39.4 |
Risk by hazard
FEMA's risk rating for each of 18 natural hazards in Mason County, highest first. "Not applicable" means the hazard is not modelled here.
| Hazard | Risk rating and score |
|---|---|
| Landslide | Relatively high 98 |
| Earthquake | Relatively moderate 97 |
| Inland (riverine) flooding | Relatively moderate 79 |
| Coastal flooding | Relatively moderate 75 |
| Heat wave | Relatively low 67 |
| Winter weather | Relatively low 47 |
| Volcanic activity | Very low 48 |
| Wildfire | Very low 44 |
| Tsunami | Very low 43 |
| Avalanche | Very low 41 |
| Ice storm | Very low 25 |
| Lightning | Very low 20 |
| Tornado | Very low 13 |
| Drought | Very low 12 |
| Strong wind | Very low 6 |
| Hail | Very low 2 |
| Cold wave | No rating |
| Hurricane | Not applicable |
FEMA disaster declarations for Mason County
Federal declarations that designated Mason County, since 1 Jan 2024 (the period this site keeps from OpenFEMA). Older declarations are in FEMA's own dataset.
Yes. Mason County has been named in 3 FEMA declarations since 1 Jan 2024. The latest is DR-4906-WA (Severe Storms, Straight-Line Winds, Flooding, Landslides, and Mudslides), declared 7 Apr 2026.
| Declaration | Kind | Incident | Declared | Individual assistance here |
|---|---|---|---|---|
| DR-4906-WA | Major disaster | Severe Storms, Straight-Line Winds, Flooding, Landslides, and Mudslides | 7 Apr 2026 | No |
| EM-3629-WA | Emergency | Severe Storms, Straight-Line Winds, Flooding, Landslides, and Mudslides | 12 Dec 2025 | No |
| DR-4775-WA | Major disaster | Severe Winter Storms, Straight-Line Winds, Flooding, Landslides, and Mudslides | 28 Apr 2024 | No |
All FEMA declarations in Washington, 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 Mason County, Washington?
FEMA's National Risk Index rates the overall risk in Mason County as relatively moderate, with a score of 85.3 out of 100 (higher than 85% of US counties). That is a comparison with other US counties, not a forecast.
What are the biggest natural hazards in Mason County?
The hazards rated highest for Mason County are landslide (relatively high), earthquake (relatively moderate), inland (riverine) flooding (relatively moderate).
What is the flood risk in Mason County?
FEMA rates inland (river and rain) flooding risk in Mason County as relatively moderate, and coastal flooding risk as relatively moderate. For a specific property, check the FEMA flood map and your local floodplain office.
Has Mason County had a FEMA disaster declaration?
Yes. Mason County has been named in 3 FEMA declarations since 1 Jan 2024. The latest is DR-4906-WA (Severe Storms, Straight-Line Winds, Flooding, Landslides, and Mudslides), declared 7 Apr 2026.
Is Mason County in a drought?
Yes. On the U.S. Drought Monitor map valid 13 October 2026, 21.55% of Mason County is in D1 Moderate Drought. Some of it has been at D1 or worse for 14 weeks in a row.
Every county in Washington, ranked · All states · Disasters near me