Natural hazards · Norris Canyon

Norris Canyon, CA natural hazards

Most of the natural-hazard damage FEMA expects in Norris Canyon comes from inland flooding, and overall the risk is very high for a U.S. community. Flood insurance has paid 1 claim here since 2022.

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

Expected damage

How exposed is Norris Canyon?

Very high

vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Norris Canyon to be higher than in 93% of U.S. communities, mostly from inland flooding and earthquakes.

Inland flooding52%Earthquakes42%Everything else7%

By hazard

What Norris Canyon faces

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

Inland flooding

52% of expected damage

Well above average · higher than 95% of U.S. places

Recorded about once a year in the area

Earthquakes

42% of expected damage

Well above average · higher than 94% of U.S. places

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 Norris Canyon flood?

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

1paid claims since 2022

$159Kpaid to owners

0homes flooded more than once

20222026

Biggest named events

California Atmospheric River: 1 claim, $159K

of homes in flood zones
are insured

of all homes
are insured

No community discount. Norris Canyon 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 Norris Canyon

Federal disasters declared here

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

Brought FEMA money into Norris CanyonDeclared for Contra Costa County only

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

Around Norris Canyon

Norris Canyon and the towns around it

Very lowLowModerateHighVery high

Norris Canyonmostly inland floodingVery high

San Ramonmostly inland floodingVery 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. Norris Canyon covers 2 census tracts, combined by population.

Money that reached townFlood claims are matched to Norris Canyon’s own flood-insurance community (here, the census tracts inside it); household aid to the registrant’s city; repair grants to Norris Canyon. 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 Norris Canyon total about $6.8M 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.