Natural hazards · Alhambra Valley

Alhambra Valley, CA natural hazards

Most of the natural-hazard damage FEMA expects in Alhambra Valley comes from earthquakes, and overall the risk is very high for a U.S. community.

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

Expected damage

How exposed is Alhambra Valley?

Very high

vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Alhambra Valley to be higher than in 92% of U.S. communities, mostly from earthquakes and inland flooding.

Earthquakes43%Inland flooding36%Wildfire12%Landslides7%Everything else2%

By hazard

What Alhambra Valley faces

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

Earthquakes

43% of expected damage

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

Inland flooding

36% of expected damage

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

Recorded about once a year in the area

Wildfire

12% of expected damage

Well above average · higher than 98% of U.S. places

Landslides

7% of expected damage

Well above average · among the top 1% of U.S. places

Lower here

TornadoesHailWinter weatherHeat wavesStrong windLightningDroughtVolcanic activity

Not a risk here

Coastal floodingHurricanesIce stormsCold wavesAvalanchesTsunamis

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 Alhambra Valley flood?

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

of homes in flood zones
are insured

of all homes
are insured

No community discount. Alhambra Valley 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 Alhambra Valley

Federal disasters declared here

None of the disasters declared for Contra Costa County shows FEMA aid or repair money reaching Alhambra Valley itself in FEMA’s records.

Brought FEMA money into Alhambra ValleyDeclared for Contra Costa County only

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

Around Alhambra Valley

Alhambra Valley and the towns around it

Very lowLowModerateHighVery high

Alhambra Valleymostly earthquakesVery high

Martinezmostly 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. Alhambra Valley 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 Alhambra Valley’s own flood-insurance community; household aid to the registrant’s city; repair grants to Alhambra Valley. 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.