Mason County, Washington

Mason County, Washington has a moderate overall risk from natural hazards in FEMA's National Risk Index. Its risk score is higher than 85% of US counties. It ranks 20th of 39 counties in Washington. The costliest hazards here are earthquakes, inland flooding and coastal flooding. FEMA estimates about $44 million a year in expected losses, or roughly $674 per resident. Since 1964 it has been included in 30 federal disaster or emergency declarations for natural events (27 major disasters). The most recent was in April 2026 (severe storms, straight-line winds, flooding, landslides and mudslides). About 1 in 83 homes here carry federal flood insurance (419 policies). Since 1978, federal flood insurance has paid about $6.4 million on 305 claims here, including $2.2 million for floods in 2022.

FEMA National Risk Index December 2025; OpenFEMA declarations to Nov 6, 2026; NFIP records. Updated November 6, 2026.

Scores are percentiles: a score of 90 means higher risk than about 90% of US counties for that hazard. Hazards FEMA does not rate here are left out. Social vulnerability is relatively high and community resilience is relatively low in FEMA's measures.

The National Weather Service has logged 17 storm reports in Mason County since 1985, with 1 death and 1 injury and about $18 million in reported damage. The strongest on record here was an EF1 tornado on October 18, 2019 near Bay Shr.

Source: NOAA Storm Events Database, county-based reports through Feb 24, 2025. Tornado records start in 1950, hail and wind in 1955, and floods and other storm types in 1996, so older decades undercount. Damage is in dollars of the year it happened and is often an estimate. Winter storms, heat and hurricanes are logged by forecast zone, not county, so they are not counted here.

National Flood Insurance Program (NFIP) records only; private flood policies are not included. Home counts as of Aug 3, 2026. Since 2021 NFIP prices each home separately under Risk Rating 2.0, so your price depends on the building, not the county. Ask an agent for a quote.

Older homes and mobile homes usually suffer more damage in storms, floods and earthquakes, and can cost more to insure. If you are buying, ask about roof age, foundation bolting and any retrofits. Source: US Census Bureau, American Community Survey 2020 to 2024 5-year estimates; 34,152 housing units.

Sources: FEMA National Risk Index (December 2025), OpenFEMA Disaster Declarations Summaries, and NFIP policy and claims data. Hazard Compass is independent and not affiliated with FEMA. These figures describe the whole county, not a single property, and are not insurance or safety advice. Report a problem.