Natural hazards · Acton

Acton, CA natural hazards

Most of the natural-hazard damage FEMA expects in Acton comes from avalanches, and overall the risk is very high for a U.S. community. Flood insurance has paid 1 claim here since 1993. 4 federal disasters brought FEMA money into town.

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

Expected damage

How exposed is Acton?

Very high

vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Acton to be higher than in 96% of U.S. communities, mostly from avalanches and inland flooding.

Avalanches37%Inland flooding24%Earthquakes20%Wildfire17%

By hazard

What Acton faces

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

Avalanches

37% of expected damage

Well below average · higher than 0% of U.S. places

Recorded about once every 8 years in the area

Inland flooding

24% of expected damage

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

Recorded about 4 times a year in the area

Earthquakes

20% of expected damage

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

Wildfire

17% of expected damage

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

Lower here

TornadoesHailWinter weatherCold wavesHeat wavesLandslidesStrong windLightning

Not a risk here

Coastal floodingHurricanesIce stormsDroughtTsunamisVolcanic 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 Acton flood?

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

1paid claims since 1993

$616paid to owners

0homes flooded more than once

19932026

of homes in flood zones
are insured

of all homes
are insured

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

Insurance rates: Los Angeles County.

Disasters that hit Acton

4 federal disasters brought FEMA money here

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

Brought FEMA money into ActonDeclared for Los Angeles County only

2025

Wildfires and Straight-Line Winds

108 households applied for aid $61K aid approved

2020

Wildfires

4 households applied for aid

2007

Wildfires, Flooding, Mud Flows, and Debris Flows

1 household applied for aid

2004

Severe Storms, Flooding, Debris Flows, and Mudslides

7 households applied for aid $4K aid approved

Los Angeles County has had 74 natural disasters declared since 1953, most often fires and floods.

Around Acton

Acton and the towns around it

Very lowLowModerateHighVery high

Agua Dulcemostly wildfiresVery high

Actonmostly avalanchesVery high

Palmdalemostly 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. Acton covers 1 census tract, combined by population.

Money that reached townFlood claims are matched to Acton’s own flood-insurance community (here, the census tracts inside it); household aid to the registrant’s city; repair grants to Acton. 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 Acton total about $4.9M 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.