Natural hazards · Millbourne

Millbourne, PA natural hazards

Most of the natural-hazard damage FEMA expects in Millbourne comes from inland flooding, and overall the risk is low for a U.S. community. 2 federal disasters brought FEMA money into town.

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

Expected damage

How exposed is Millbourne?

Low

vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Millbourne to be higher than in 27% of U.S. communities, mostly from inland flooding.

Inland flooding49%Earthquakes13%Heat waves12%Cold waves8%Tornadoes7%Everything else12%

By hazard

What Millbourne faces

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

Inland flooding

49% of expected damage

Below average · higher than 42% of U.S. places

Recorded about 5 times a year in the area

Earthquakes

13% of expected damage

Well above average · higher than 76% of U.S. places

Heat waves

12% of expected damage

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

Recorded about 11 times a year in the area

Cold waves

8% of expected damage

Below average · higher than 37% of U.S. places

Recorded about once a year in the area

Tornadoes

7% of expected damage

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

Lower here

HurricanesHailIce stormsWinter weatherLandslidesStrong windLightning

Not a risk here

Coastal floodingWildfireDroughtAvalanchesTsunamisVolcanic 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 Millbourne flood?

FEMA's records show no paid flood insurance claims in Millbourne.

of homes in flood zones
are insured

of all homes
are insured

No community discount. Millbourne 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 Millbourne

2 federal disasters brought FEMA money here

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

Brought FEMA money into MillbourneDeclared for Delaware County only

2021

Remnants of Hurricane Ida

2 households applied for aid $300 aid approved

2011

Hurricane Irene

1 household applied for aid

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

Around Millbourne

Millbourne and the towns around it

Very lowLowModerateHighVery high

Philadelphiamostly inland floodingModerate

Upper Darbymostly inland floodingLow

Millbournemostly inland floodingLow

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. Millbourne is smaller than a census tract, so it shares the figures of the tract around its center.

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

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.