Chester County, Pennsylvania

Chester County, Pennsylvania has a moderate overall risk from natural hazards in FEMA's National Risk Index. Its risk score is higher than 92% of US counties. It ranks 9th of 67 counties in Pennsylvania. The costliest hazards here are inland flooding, heat waves and drought. FEMA estimates about $173 million a year in expected losses, or roughly $323 per resident. Since 1965 it has been included in 24 federal disaster or emergency declarations for natural events (17 major disasters). The most recent was in September 2021 (remnants of hurricane ida). Fewer than 1 in 100 homes here carry federal flood insurance (1,015 policies). Since 1978, federal flood insurance has paid about $38 million on 1,914 claims here, including $14 million for floods in 2021.

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 very low and community resilience is very high in FEMA's measures.

The National Weather Service has logged 1,310 storm reports in Chester County since 1953, with 12 deaths and 55 injuries and about $80.3 million in reported damage. The strongest on record here was an F3 tornado on March 22, 1955.

Source: NOAA Storm Events Database, county-based reports through Jul 28, 2026. 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.

Since 1863, 2 hurricanes and 14 tropical storms have passed within 65 miles of the center of Chester County, 7 of them since 1950. The strongest was an unnamed hurricane in 1878, with top winds near 90 mph about 46 miles away.

Source: NOAA National Hurricane Center best-track records (HURDAT2), 1851 to 2025 for the Atlantic and 1949 to 2025 for the eastern Pacific. A storm counts if its track passed within 65 miles of the county's center while it was a tropical storm or hurricane. Strength is the storm's top sustained wind at that point, not the wind measured in the county. Older storms over the open sea were sometimes missed.

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; 212,491 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.