Natural hazards · Rancho Cucamonga

Rancho Cucamonga, CA natural hazards

Most of the natural-hazard damage FEMA expects in Rancho Cucamonga comes from inland flooding, and overall the risk is very high for a U.S. community. Flood insurance has paid 25 claims here since 1979. 6 federal disasters brought FEMA money into town.

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

Expected damage

How exposed is Rancho Cucamonga?

Very high

vs. U.S. communities

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

Inland flooding61%Earthquakes35%Everything else4%

By hazard

What Rancho Cucamonga faces

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

Inland flooding

61% of expected damage

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

Recorded about 13 times a year in the area

Earthquakes

35% of expected damage

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

Lower here

TornadoesHailWinter weatherHeat wavesWildfireLandslidesStrong windLightningDrought

Not a risk here

Coastal floodingHurricanesIce stormsCold wavesAvalanchesTsunamisVolcanic 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 Rancho Cucamonga flood?

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

25paid claims since 1979

$109Kpaid to owners

2homes flooded more than once

19792026

Biggest named events

Pineapple Express - Southern: 1 claim, $847

Homes that flooded again and again

■ FEMA “severe repetitive loss” (1) ■ flooded 2+ times

of homes in flood zones
are insured

of all homes
are insured

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

Insurance rates: San Bernardino County.

Disasters that hit Rancho Cucamonga

6 federal disasters brought FEMA money here

Disasters the President declared that paid out in Rancho Cucamonga itself: aid to households, or repair grants to the City of Rancho Cucamonga.

Brought FEMA money into Rancho CucamongaDeclared for San Bernardino County only

2023

Severe Winter Storms, Straight-Line Winds, Flooding, Landslides, and Mudslides

44 households applied for aid $6K aid approved

2020

Wildfires

48 households applied for aid

2010

Severe Winter Storms, Flooding, and Debris and Mud Flows

$54K to the City of Rancho Cucamonga for repairs

2007

Wildfires, Flooding, Mud Flows, and Debris Flows

7 households applied for aid $2K aid approved

2004

Severe Storms, Flooding, Debris Flows, and Mudslides

22 households applied for aid $5K aid approved

2003

Wildfires, Flooding, Mudflow and Debris Flow Directly Related T

147 households applied for aid $117K aid approved $362K to the City of Rancho Cucamonga for repairs

San Bernardino County has had 56 natural disasters declared since 1953, most often fires and floods.

Around Rancho Cucamonga

Rancho Cucamonga and the towns around it

Very lowLowModerateHighVery high

San Antonio Heightsmostly inland floodingVery high

Ontariomostly inland floodingVery high

Rancho Cucamongamostly inland floodingVery high

Uplandmostly inland floodingVery high

Fontanamostly 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. Rancho Cucamonga covers 36 census tracts, combined by population.

Money that reached townFlood claims are matched to Rancho Cucamonga’s own flood-insurance community; household aid to the registrant’s city; repair grants to the City of Rancho Cucamonga. 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 Rancho Cucamonga total about $191M 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.