Natural hazards · Sewickley

Sewickley, PA natural hazards

Most of the natural-hazard damage FEMA expects in Sewickley comes from inland flooding, and overall the risk is high for a U.S. community. Flood insurance has paid 13 claims here since 1995. 1 federal disaster brought FEMA money into town.

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

Expected damage

How exposed is Sewickley?

High

vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Sewickley to be higher than in 66% of U.S. communities, mostly from inland flooding.

Inland flooding90%Cold waves5%Everything else5%

By hazard

What Sewickley faces

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

Inland flooding

90% of expected damage

Well above average · higher than 87% of U.S. places

Recorded about 7 times a year in the area

Cold waves

5% of expected damage

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

Recorded about 3 times a year in the area

Lower here

HurricanesTornadoesHailIce stormsWinter weatherHeat wavesWildfireEarthquakesLandslidesStrong windLightning

Not a risk here

Coastal floodingDroughtAvalanchesTsunamisVolcanic 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 Sewickley flood?

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

13paid claims since 1995

$81Kpaid to owners

2homes flooded more than once

19952026

Biggest named events

Tropical Storm Ivan: 1 claim, $6K

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. Sewickley isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.

Insurance rates: Allegheny County.

Disasters that hit Sewickley

1 federal disaster brought FEMA money here

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

Brought FEMA money into SewickleyDeclared for Allegheny County only

2004

Tropical Depression Ivan

142 households applied for aid $404K aid approved

Allegheny County has had 16 natural disasters declared since 1953, most often floods and severe storms.

Around Sewickley

Sewickley and the towns around it

Very lowLowModerateHighVery high

Edgeworthmostly inland floodingVery high

Sewickleymostly inland floodingHigh

Aleppomostly inland floodingModerate

Glen Osbornemostly inland floodingModerate

Sewickley Heightsmostly inland floodingLow

Moonmostly 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. Sewickley covers 1 census tract, combined by population.

Money that reached townFlood claims are matched to Sewickley’s own flood-insurance community; household aid to the registrant’s city; repair grants to the Borough of Sewickley. 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 Sewickley total about $1.9M 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.