Natural hazards · Diamond Bar

Diamond Bar, CA natural hazards

Most of the natural-hazard damage FEMA expects in Diamond Bar comes from earthquakes, and overall the risk is very high for a U.S. community. Flood insurance has paid 1 claim here since 1998. 6 federal disasters brought FEMA money into town.

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

Expected damage

How exposed is Diamond Bar?

Very high

vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Diamond Bar to be higher than in 85% of U.S. communities, mostly from earthquakes and inland flooding.

Earthquakes53%Inland flooding40%Wildfire6%Everything else1%

By hazard

What Diamond Bar faces

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

Earthquakes

53% of expected damage

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

Inland flooding

40% of expected damage

Well above average · higher than 77% of U.S. places

Recorded about 4 times a year in the area

Wildfire

6% of expected damage

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

Lower here

TornadoesHailWinter weatherHeat wavesLandslidesStrong windLightning

Not a risk here

Coastal floodingHurricanesIce stormsCold wavesDroughtAvalanchesTsunamisVolcanic 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 Diamond Bar flood?

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

1paid claims since 1998

$7Kpaid to owners

0homes flooded more than once

19982026

Biggest named events

Pineapple Express - Southern: 1 claim, $7K

of homes in flood zones
are insured

of all homes
are insured

No community discount. Diamond Bar 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 Diamond Bar

6 federal disasters brought FEMA money here

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

Brought FEMA money into Diamond BarDeclared for Los Angeles County only

2025

Wildfires and Straight-Line Winds

77 households applied for aid $20K aid approved

2020

Wildfires

8 households applied for aid

2017

Severe Winter Storms, Flooding, and Mudslides

$945K to the City of Diamond Bar for repairs

2010

Severe Winter Storms, Flooding, and Debris and Mud Flows

$13K to the City of Diamond Bar for repairs

2004

Severe Storms, Flooding, Debris Flows, and Mudslides

25 households applied for aid $56K aid approved $55K to the City of Diamond Bar for repairs

2003

Wildfires, Flooding, Mudflow and Debris Flow Directly Related T

8 households applied for aid

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

Around Diamond Bar

Diamond Bar and the towns around it

Very lowLowModerateHighVery high

Pomonamostly earthquakesVery high

Chino Hillsmostly inland floodingVery high

Industrymostly earthquakesVery high

Rowland Heightsmostly earthquakesVery high

Diamond Barmostly 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. Diamond Bar covers 9 census tracts, combined by population.

Money that reached townFlood claims are matched to Diamond Bar’s own flood-insurance community; household aid to the registrant’s city; repair grants to the City of Diamond Bar. 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 Diamond Bar total about $24.0M 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.