Natural hazards · Rossmoor

Rossmoor, CA natural hazards

Most of the natural-hazard damage FEMA expects in Rossmoor comes from inland flooding, and overall the risk is very high for a U.S. community. Flood insurance has paid 3 claims here since 1983. 1 federal disaster brought FEMA money into town.

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

Expected damage

How exposed is Rossmoor?

Very high

vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Rossmoor to be higher than in 93% of U.S. communities, mostly from inland flooding and earthquakes.

Inland flooding62%Earthquakes37%

By hazard

What Rossmoor faces

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

Inland flooding

62% of expected damage

Well above average · higher than 97% of U.S. places

Recorded about 3 times a year in the area

Earthquakes

37% of expected damage

Well above average · higher than 92% of U.S. places

Lower here

Coastal floodingTornadoesHailHeat wavesLandslidesStrong windLightningTsunamis

Not a risk here

HurricanesIce stormsWinter weatherCold wavesWildfireDroughtAvalanchesVolcanic 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 Rossmoor flood?

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

3paid claims since 1983

$18Kpaid to owners

0homes flooded more than once

19832026

Biggest named events

Pineapple Express - Southern: 1 claim, $15K

of homes in flood zones
are insured

of all homes
are insured

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

Insurance rates: Orange County.

Disasters that hit Rossmoor

1 federal disaster brought FEMA money here

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

Brought FEMA money into RossmoorDeclared for Orange County only

2017

Wildfires

1 household applied for aid

Orange County has had 36 natural disasters declared since 1953, most often fires and floods.

Around Rossmoor

Rossmoor and the towns around it

Very lowLowModerateHighVery high

Seal Beachmostly inland floodingVery high

Rossmoormostly inland floodingVery high

Los Alamitosmostly earthquakesVery high

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. Rossmoor covers 3 census tracts, combined by population.

Money that reached townFlood claims are matched to Rossmoor’s own flood-insurance community (here, the census tracts inside it); household aid to the registrant’s city; repair grants to Rossmoor. 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 Rossmoor total about $10.6M 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.