Natural hazards · Alta

Alta, CA natural hazards

Most of the natural-hazard damage FEMA expects in Alta comes from avalanches, 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 Alta?

Very high

vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Alta to be higher than in 98% of U.S. communities, mostly from avalanches and wildfires.

Avalanches64%Wildfire29%Inland flooding6%Everything else2%

By hazard

What Alta faces

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

Avalanches

64% of expected damage

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

Recorded about once every 2 years in the area

Wildfire

29% of expected damage

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

Inland flooding

6% of expected damage

Above average · higher than 52% of U.S. places

Recorded about once a year in the area

Lower here

TornadoesHailWinter weatherHeat wavesEarthquakesLandslidesStrong windLightningVolcanic activity

Not a risk here

Coastal floodingHurricanesIce stormsCold wavesDroughtTsunamis

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 Alta flood?

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

of homes in flood zones
are insured

of all homes
are insured

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

Insurance rates: Placer County.

What’s been done with FEMA grants

1flood-prone properties bought out and cleared

Disasters that hit Alta

Federal disasters declared here

None of the disasters declared for Placer County shows FEMA aid or repair money reaching Alta itself in FEMA’s records.

Brought FEMA money into AltaDeclared for Placer County only

Placer County has had 24 natural disasters declared since 1953, most often fires and floods.

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