Natural hazards · Tredyffrin

Tredyffrin, PA natural hazards

Most of the natural-hazard damage FEMA expects in Tredyffrin comes from inland flooding, and overall the risk is very low for a U.S. community. Flood insurance has paid 79 claims here since 1978.

FEMA National Risk Index, December 2025 · OpenFEMA claims, aid & declarations

Expected damage

How exposed is Tredyffrin?

Very low

vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Tredyffrin to be higher than in 15% of U.S. communities, mostly from inland flooding.

Inland flooding66%Heat waves7%Tornadoes6%Earthquakes5%Everything else16%

By hazard

What Tredyffrin faces

Each hazard’s share of the damage FEMA expects here, and how that compares with the rest of the country.

Inland flooding

66% of expected damage

Below average · higher than 33% of U.S. places

Recorded about 5 times a year in the area

Heat waves

7% of expected damage

Well below average · higher than 16% of U.S. places

Recorded about 11 times a year in the area

Tornadoes

6% of expected damage

Below average · higher than 44% of U.S. places

Earthquakes

5% of expected damage

Above average · higher than 54% of U.S. places

Lower here

HurricanesHailIce stormsWinter weatherCold wavesWildfireLandslidesStrong windLightningDrought

Not a risk here

Coastal floodingAvalanchesTsunamisVolcanic activity

Flood risk changes street by street. Check a specific address on FEMA’s flood map, and ask about flood insurance before you buy.

Flood insurance claims

Does Tredyffrin flood?

Every paid claim on a federal flood insurance policy in Tredyffrin, from FEMA’s records.

79paid claims since 1978

$2.4Mpaid to owners

15homes flooded more than once

19782026

Biggest named events

Tropical Storm Fred: 6 claims, $348K
Hurricane Floyd: 5 claims, $44K
Hurricane Ida: 5 claims, $423K

Homes that flooded again and again

■ FEMA “severe repetitive loss” (3) ■ flooded 2+ times

of homes in flood zones
are insured

of all homes
are insured

No community discount. Tredyffrin isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.

Insurance rates: Chester County.

Disasters that hit Tredyffrin

Federal disasters declared here

None of the disasters declared for Chester County shows FEMA aid or repair money reaching Tredyffrin itself in FEMA’s records.

Brought FEMA money into TredyffrinDeclared for Chester County only

Chester County has had 22 natural disasters declared since 1953, most often hurricanes and floods.

Around Tredyffrin

Tredyffrin and the towns around it

Very lowLowModerateHighVery high

Upper Merionmostly inland floodingLow

Schuylkillmostly inland floodingLow

Tredyffrinmostly inland floodingVery low

Radnormostly inland floodingVery low

Willistownmostly inland floodingVery low

Easttownmostly inland floodingVery low

East Whitelandmostly inland floodingVery low

About these numbers

How to read this page

An average, not a forecastFEMA’s National Risk Index estimates the damage 18 kinds of natural hazards cause in a typical year, from decades of records and models. A quiet decade can follow a bad year.

Compared by rate“Higher than N%” compares yearly damage as a share of what’s here, so a big city isn’t rated riskier just for having more buildings. Tredyffrin covers 7 census tracts, combined by population.

Money that reached townFlood claims are matched to Tredyffrin’s own flood-insurance community; household aid to the registrant’s city; repair grants to the Township of Tredyffrin. FEMA’s model follows property values, so a place that recently lost many homes can rate lower than it feels.

FEMA’s expected losses across Tredyffrin total about $9.6M a year, counting buildings, people and crops.

Sources: FEMA National Risk Index (December 2025); OpenFEMA: NFIP redacted claims, multiple-loss properties, community status book and residential penetration rates, housing assistance (owners and renters), public assistance funded projects, hazard mitigation properties and disaster declarations. Census tracts: U.S. Census Bureau.