Natural hazards · Radnor

Radnor, PA natural hazards

Most of the natural-hazard damage FEMA expects in Radnor comes from inland flooding, and overall the risk is very low for a U.S. community. Flood insurance has paid 103 claims here since 1979. 1 federal disaster brought FEMA money into town.

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

Expected damage

How exposed is Radnor?

Very low

vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Radnor to be higher than in 7% of U.S. communities, mostly from inland flooding.

Inland flooding58%Heat waves9%Tornadoes8%Earthquakes7%Hurricanes6%Cold waves6%Everything else8%

By hazard

What Radnor faces

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

Inland flooding

58% of expected damage

Well below average · higher than 15% of U.S. places

Recorded about 5 times a year in the area

Heat waves

9% of expected damage

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

Recorded about 11 times a year in the area

Tornadoes

8% of expected damage

Above average · higher than 50% of U.S. places

Earthquakes

7% of expected damage

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

Hurricanes

6% of expected damage

Above average · higher than 66% of U.S. places

Recorded about once every 11 years in the area

Cold waves

6% of expected damage

Below average · higher than 38% of U.S. places

Recorded about once a year in the area

Lower here

HailIce stormsWinter weatherWildfireLandslidesStrong 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 Radnor flood?

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

103paid claims since 1979

$1.3Mpaid to owners

19homes flooded more than once

19792026

Biggest named events

Hurricane Floyd: 13 claims, $47K
Hurricane Irene: 8 claims, $61K
Hurricane Isaias: 3 claims, $145K

Homes that flooded again and again

■ FEMA “severe repetitive loss” (0) ■ flooded 2+ times

of homes in flood zones
are insured

of all homes
are insured

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

Insurance rates: Delaware County.

Disasters that hit Radnor

1 federal disaster brought FEMA money here

Disasters the President declared that paid out in Radnor itself: aid to households, or repair grants to the Township of Radnor.

Brought FEMA money into RadnorDeclared for Delaware County only

2004

Tropical Depression Ivan

1 household applied for aid $5K aid approved

Delaware County has had 20 natural disasters declared since 1953, most often hurricanes and floods.

Around Radnor

Radnor and the towns around it

Very lowLowModerateHighVery high

Upper Merionmostly inland floodingLow

Lower Merionmostly inland floodingLow

Haverfordmostly inland floodingVery low

Tredyffrinmostly inland floodingVery low

Radnormostly inland floodingVery low

Marplemostly inland floodingVery low

Newtownmostly 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. Radnor covers 7 census tracts, combined by population.

Money that reached townFlood claims are matched to Radnor’s own flood-insurance community; household aid to the registrant’s city; repair grants to the Township of Radnor. 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 Radnor total about $8.7M 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.