Natural hazards · Janesville

Janesville, CA natural hazards

Most of the natural-hazard damage FEMA expects in Janesville comes from wildfires, and overall the risk is very high for a U.S. community. 1 federal disaster brought FEMA money into town.

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

Expected damage

How exposed is Janesville?

Very high

vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Janesville to be higher than in 97% of U.S. communities, mostly from wildfires and inland flooding.

Wildfire60%Inland flooding23%Earthquakes14%Everything else4%

By hazard

What Janesville faces

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

Wildfire

60% of expected damage

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

Inland flooding

23% of expected damage

Well above average · higher than 78% of U.S. places

Recorded about once every 4 years in the area

Earthquakes

14% of expected damage

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

Lower here

TornadoesHailWinter weatherHeat wavesLandslidesStrong windLightningDroughtAvalanchesVolcanic activity

Not a risk here

Coastal floodingHurricanesIce stormsCold wavesTsunamis

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 Janesville flood?

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

of homes in flood zones
are insured

of all homes
are insured

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

Insurance rates: Lassen County.

Disasters that hit Janesville

1 federal disaster brought FEMA money here

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

Brought FEMA money into JanesvilleDeclared for Lassen County only

2021

Wildfires

42 households applied for aid $58K aid approved

Lassen County has had 16 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. Janesville covers 1 census tract, combined by population.

Money that reached townFlood claims are matched to Janesville’s own flood-insurance community; household aid to the registrant’s city; repair grants to Janesville. 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 Janesville total about $3.1M 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.