Natural hazards · Aliso Viejo

Aliso Viejo, CA natural hazards

Most of the natural-hazard damage FEMA expects in Aliso Viejo comes from inland flooding, and overall the risk is high for a U.S. community. Flood insurance has paid 1 claim here since 2010. 4 federal disasters brought FEMA money into town.

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

Expected damage

How exposed is Aliso Viejo?

High

vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Aliso Viejo to be higher than in 75% of U.S. communities, mostly from inland flooding and earthquakes.

Inland flooding65%Earthquakes31%Everything else3%

By hazard

What Aliso Viejo faces

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

Inland flooding

65% of expected damage

Well above average · higher than 82% of U.S. places

Recorded about 3 times a year in the area

Earthquakes

31% of expected damage

Well above average · higher than 86% of U.S. places

Lower here

TornadoesHailHeat wavesWildfireLandslidesStrong windLightning

Not a risk here

Coastal floodingHurricanesIce stormsWinter weatherCold wavesDroughtAvalanchesTsunamisVolcanic 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 Aliso Viejo flood?

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

1paid claims since 2010

$4Kpaid to owners

0homes flooded more than once

20102026

of homes in flood zones
are insured

of all homes
are insured

No community discount. Aliso Viejo 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 Aliso Viejo

4 federal disasters brought FEMA money here

Disasters the President declared that paid out in Aliso Viejo itself: aid to households, or repair grants to the City of Aliso Viejo.

Brought FEMA money into Aliso ViejoDeclared for Orange County only

2017

Wildfires

40 households applied for aid $1K aid approved

2017

Severe Winter Storms, Flooding, and Mudslides

$9K to the City of Aliso Viejo for repairs

2010

Severe Winter Storms, Flooding, and Debris and Mud Flows

$36K to the City of Aliso Viejo for repairs

2007

Wildfires, Flooding, Mud Flows, and Debris Flows

1 household applied for aid

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

Around Aliso Viejo

Aliso Viejo and the towns around it

Very lowLowModerateHighVery high

Laguna Hillsmostly inland floodingVery high

Laguna Woodsmostly inland floodingVery high

Aliso Viejomostly inland floodingHigh

Laguna Beachmostly earthquakesHigh

Laguna Niguelmostly inland floodingHigh

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. Aliso Viejo covers 10 census tracts, combined by population.

Money that reached townFlood claims are matched to Aliso Viejo’s own flood-insurance community; household aid to the registrant’s city; repair grants to the City of Aliso Viejo. 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 Aliso Viejo total about $20.5M 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.