Natural hazards · Alamo

Alamo, CA natural hazards

Most of the natural-hazard damage FEMA expects in Alamo comes from earthquakes, and overall the risk is very high 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 Alamo?

Very high

vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Alamo to be higher than in 86% of U.S. communities, mostly from earthquakes and inland flooding.

Earthquakes51%Inland flooding42%Everything else8%

By hazard

What Alamo faces

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

Earthquakes

51% of expected damage

Well above average · higher than 93% of U.S. places

Inland flooding

42% of expected damage

Well above average · higher than 80% of U.S. places

Recorded about once a year in the area

Lower here

TornadoesHailWinter weatherHeat wavesWildfireLandslidesStrong windLightningVolcanic activity

Not a risk here

Coastal floodingHurricanesIce stormsCold wavesDroughtAvalanchesTsunamis

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 Alamo flood?

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

of homes in flood zones
are insured

of all homes
are insured

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

Insurance rates: Contra Costa County.

Disasters that hit Alamo

2 federal disasters brought FEMA money here

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

Brought FEMA money into AlamoDeclared for Contra Costa County only

2022

Severe Winter Storms, Flooding, Landslides, and Mudslides

35 households applied for aid $79K aid approved

2005

Severe Storms, Flooding, Mudslides, and Landslides

3 households applied for aid $2K aid approved

Contra Costa County has had 17 natural disasters declared since 1953, most often floods and severe storms.

Around Alamo

Alamo and the towns around it

Very lowLowModerateHighVery high

Castle Hillmostly inland floodingVery high

Danvillemostly inland floodingVery high

Walnut Creekmostly earthquakesVery high

Diablomostly earthquakesVery high

Alamomostly 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. Alamo 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 Alamo’s own flood-insurance community; household aid to the registrant’s city; repair grants to Alamo. 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.