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Natural hazards · Whitemarsh

Whitemarsh, PA natural hazards

Most of the natural-hazard damage FEMA expects in Whitemarsh comes from inland flooding, and overall the risk is moderate for a U.S. community. Flood insurance has paid 290 claims here since 1978.

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

How exposed is Whitemarsh?

43
Moderate
vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Whitemarsh to be higher than in 43% of U.S. communities, mostly from inland flooding.

Inland flooding73%Cold waves7%Heat waves5%Everything else15%
By hazard

What Whitemarsh faces

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

Inland flooding

73% of expected damage
Above average · higher than 67% of U.S. places
Recorded about 6 times a year in the area

Cold waves

7% of expected damage
Below average · higher than 25% of U.S. places
Recorded about once a year in the area

Heat waves

5% of expected damage
Above average · higher than 53% of U.S. places
Recorded about 11 times a year in the area

Lower here

HurricanesTornadoesHailIce stormsWinter weatherWildfireEarthquakesLandslidesStrong 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 Whitemarsh flood?

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

290paid claims since 1978
$22.7Mpaid to owners
49homes flooded more than once
19782026

Biggest named events

  • Hurricane Ida: 37 claims, $5.8M
  • Tropical Storm Allison: 35 claims, $3.6M
  • Hurricane Irene: 29 claims, $3.0M

Homes that flooded again and again

■ FEMA “severe repetitive loss” (18) ■ flooded 2+ times

of homes in flood zones
are insured
of all homes
are insured
No community discount. Whitemarsh isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.
Insurance rates: Montgomery County.
Disasters that hit Whitemarsh

Federal disasters declared here

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

Brought FEMA money into WhitemarshDeclared for Montgomery County only
Montgomery County has had 24 natural disasters declared since 1953, most often hurricanes and floods.
Around Whitemarsh

Whitemarsh and the towns around it

Springfield: Low, mostly inland floodingPlymouth: Low, mostly inland floodingConshohocken: High, mostly inland floodingUpper Dublin: Very low, mostly inland floodingLower Merion: Low, mostly inland floodingPhiladelphia: Moderate, mostly inland floodingCheltenham: Low, mostly inland floodingUpper Merion: Low, mostly inland floodingNorristown: High, mostly inland floodingEast Norriton: Low, mostly inland floodingWhitpain: Low, mostly inland floodingWest Conshohocken: High, mostly inland floodingAbington: Very low, mostly inland floodingAmbler: Low, mostly inland floodingLower Gwynedd: Low, mostly inland floodingHorsham: Very low, mostly inland floodingHaverford: Very low, mostly inland floodingRadnor: Very low, mostly inland floodingBensalem: Low, mostly inland floodingUpper Darby: Low, mostly inland floodingYeadon: Low, mostly inland floodingColwyn: Moderate, mostly inland floodingTinicum: Moderate, mostly inland floodingDarby: Very low, mostly inland floodingFolcroft: Very low, mostly inland floodingCamden: High, mostly inland floodingPennsauken: Low, mostly inland floodingMillbourne: Low, mostly inland floodingWhitemarsh: Moderate, mostly inland flooding WhitemarshSpringfieldPlymouthConshohockenUpper DublinLower MerionPhiladelphia
Very lowLowModerateHighVery high
Conshohockenmostly inland floodingHigh
Philadelphiamostly inland floodingModerate
Whitemarshmostly inland floodingModerate
Plymouthmostly inland floodingLow
Lower Merionmostly inland floodingLow
Springfieldmostly inland floodingLow
Upper Dublinmostly 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. Whitemarsh covers 5 census tracts, combined by population.
Money that reached townFlood claims are matched to Whitemarsh’s own flood-insurance community; household aid to the registrant’s city; repair grants to the Township of Whitemarsh. 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 Whitemarsh 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.

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Boundary source: https://tigerweb.geo.census.gov/arcgis/rest/services/TIGERweb/Places_CouSub_ConCity_SubMCD/MapServer/15 · 2025-01-01
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