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Natural hazards · Upper St. Clair

Upper St. Clair, PA natural hazards

Most of the natural-hazard damage FEMA expects in Upper St. Clair comes from inland flooding, and overall the risk is very low for a U.S. community. Flood insurance has paid 32 claims here since 1980. 1 federal disaster brought FEMA money into town.

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

How exposed is Upper St. Clair?

8
Very low
vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Upper St. Clair to be higher than in 8% of U.S. communities, mostly from inland flooding.

Inland flooding76%Cold waves13%Everything else11%
By hazard

What Upper St. Clair faces

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

Inland flooding

76% of expected damage
Below average · higher than 29% of U.S. places
Recorded about 7 times a year in the area

Cold waves

13% 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 Upper St. Clair flood?

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

32paid claims since 1980
$1.1Mpaid to owners
5homes flooded more than once
19802026

Biggest named events

  • Tropical Storm Ivan: 6 claims, $76K
  • Hurricane Ida: 1 claim, $4K

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
🏷️ 15% off flood insurance. Upper St. Clair is in FEMA’s Community Rating System (class 7) for its flood-proofing work.
Insurance rates: Allegheny County.

What’s been done with FEMA grants

1flood-prone properties bought out and cleared
Disasters that hit Upper St. Clair

1 federal disaster brought FEMA money here

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

Brought FEMA money into Upper St. ClairDeclared for Allegheny County only
2004

Tropical Depression Ivan

2 households applied for aid $370 aid approved
Allegheny County has had 16 natural disasters declared since 1953, most often floods and severe storms.
Around Upper St. Clair

Upper St. Clair and the towns around it

South Fayette: Very low, mostly inland floodingBridgeville: Moderate, mostly inland floodingScott: Very low, mostly inland floodingBethel Park: Very low, mostly inland floodingPeters: Very low, mostly inland floodingMount Lebanon: Very low, mostly inland floodingNorth Fayette: Very low, mostly inland floodingCollier: Very low, mostly inland floodingOakdale: High, mostly inland floodingMcDonald: Moderate, mostly inland floodingCecil: Very low, mostly inland floodingCarnegie: Moderate, mostly inland floodingHeidelberg: High, mostly inland floodingPittsburgh: High, mostly inland floodingGreen Tree: Very low, mostly inland floodingRosslyn Farms: Low, mostly inland floodingSouth Park: Low, mostly inland floodingBaldwin: Very low, mostly inland floodingCastle Shannon: Low, mostly inland floodingWhitehall: Very low, mostly inland floodingNorth Strabane: Very low, mostly inland floodingNottingham: Low, mostly inland floodingUnion: Low, mostly inland floodingDormont: Very low, mostly inland floodingBaldwin: Very low, mostly inland floodingUpper St. Clair: Very low, mostly inland flooding Upper St. ClairSouth FayetteBridgevilleScottBethel ParkPetersMount Lebanon
Very lowLowModerateHighVery high
Bridgevillemostly inland floodingModerate
South Fayettemostly inland floodingVery low
Scottmostly inland floodingVery low
Petersmostly inland floodingVery low
Upper St. Clairmostly inland floodingVery low
Bethel Parkmostly inland floodingVery low
Mount Lebanonmostly 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. Upper St. Clair covers 5 census tracts, combined by population.
Money that reached townFlood claims are matched to Upper St. Clair’s own flood-insurance community; household aid to the registrant’s city; repair grants to the Township of Upper St. Clair. 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 Upper St. Clair total about $4.2M 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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