Photo: jaymanuel · CC BY-SA 4.0FEMA expects more hazard damage per building in Glendora than in 95% of U.S. towns, led by river and rain flooding
On FEMA’s National Risk Index, Glendora gets a D for hazard risk: higher expected damage per building than 95% of U.S. towns, #553 of 847 in California. Most of that expected damage is river and rain flooding (49%), then earthquakes (42%). Flood insurance has paid 8 claims here since 1980.
Graded on FEMA’s expected yearly building damage per dollar of building value (NRI v1.20, December 2025), weighted by where residents live; flood claims are shown, not graded. How hazard risk is graded
What Glendora faces
Each hazard’s share of the building damage FEMA expects here, and how its rate compares with the rest of the country.
River and rain flooding
Earthquakes
Wildfire
Shares are of FEMA’s expected building damage, the measure the grade uses; ranks compare each hazard’s building-damage rate with all 85,154 U.S. census tracts. In FEMA’s terms, river and rain flooding is FEMA’s “Inland Flooding” (rivers and streams overflowing their banks, or rain overwhelming drainage). FEMA defines coastal flooding as high or rising tides and storm surge, so surge damage is counted there. Drought isn’t listed: FEMA counts its losses in crops only.
What’s behind Glendora’s grade
River and rain flooding is 49% of the building damage FEMA expects in Glendora, and Glendora’s rate of river and rain flooding damage is in the top 9% of U.S. census tracts. Earthquakes add 42%, at a rate in the top 6% of U.S. census tracts.
D #553 of 847 in California; higher expected damage per building than 95% of U.S. towns (21,298).
Glendora’s residents live in 13 census tracts; FEMA’s figures are combined by where they live.
The typical California town has higher expected damage than 92% of U.S. towns; within the state, Glendora has more expected damage per building than 65% of California towns.
In dollars, FEMA expects about $43.3M a year in losses across Glendora: $33.9M to buildings, the rest to people and crops.
Does Glendora flood? Rarely: 8 flood claims since 1980
Every paid claim on a federal flood insurance policy in Glendora, from FEMA’s records: 0.5 per 1,000 homes, fewer than 90% of the 13,809 U.S. towns with a flood insurance record.
- The Pineapple Express - Southern1 claim · $3K
Glendora 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.4 federal disasters brought FEMA money to Glendora
Disasters that paid out in Glendora itself (aid to households or repair grants to the City of Glendora), newest first, with that year’s flood claims.
- 2025Wildfires and Straight-line Winds145 households applied for aid$13K aid approved
- 2017Severe Winter Storms, Flooding, and Mudslides$109K to the City of Glendora for repairs
- 2004Severe Storms, Flooding, Debris Flows, and Mudslides9 households applied for aid$666 aid approved$8K to the City of Glendora for repairs
- 2003Wildfires, Flooding, Mudflow and Debris Flow Directly Related T2 households applied for aid$887 aid approved
Los Angeles County has had 40 natural disasters declared by the President since 1953, most often severe storms, then floods. Not counted: the 2005 Hurricane Katrina evacuee emergency, which covered counties that took in evacuees.
Also 44 FEMA wildfire suppression grants (Fire Management Assistance, not a disaster declaration) for fires in Los Angeles County, 2002–2025.
Old photos of Glendora after a storm or flood belong in the town’s history. Add one, or share what you remember below.
Add to the Glendora archive →Glendora and its neighbors
Glendora is 6th of the 6 graded towns here, from least expected damage per building to most. Tap a town to see its hazards.
| Town | Hazard risk | Mostly (buildings) | Flood claims |
|---|---|---|---|
| Charter Oak | Dmore damage than 91% | earthquakes | — |
| San Dimas | Dmore damage than 92% | river and rain flooding | 4 |
| Covina | Dmore damage than 92% | earthquakes | 1 |
| Azusa | Dmore damage than 92% | earthquakes | 1 |
| Citrus | Dmore damage than 92% | river and rain flooding | — |
| Glendora | Dmore damage than 95% | river and rain flooding | 8 |
Hazard risk = FEMA’s expected yearly building damage per dollar of building value, vs. the 21,298 U.S. towns we grade; the map is shaded by fifths of the same scale. Flood claims = paid federal flood insurance claims on record.
Get ready for what Glendora faces
A short kit for the hazards that drive the building damage here, what to check before you buy, and where neighbors get alerts.
- Turn around at flooded roads: a foot of moving water can carry off a car.
- Flood insurance usually takes 30 days to start, so buy it before the forecast.
- Keep papers and medicines up high, in a grab-and-go bag.
- Drop, cover and hold on.
- Strap tall furniture and the water heater to the wall.
- Know how to shut off the gas.
- Clear dead leaves and brush within 5 feet of the house.
- Sign up for local alerts and know two ways out.
- Keep N95 masks for smoky days.
- Look up the address on FEMA’s flood map.
- Ask the seller or landlord whether it has ever flooded, and what flood insurance costs there.
- Get a flood insurance quote early: policies usually start 30 days after you buy.
Know where neighbors sign up for alerts? Add it to the Handbook so everyone has it.
Questions about natural hazards in Glendora
Is Glendora at risk for natural disasters?
On FEMA’s National Risk Index, Glendora has higher expected damage per building than 95% of U.S. towns: D for hazard risk, #553 of 847 in California. Most of the expected damage is river and rain flooding (49%) and earthquakes (42%). This is FEMA’s model of an average year for today’s buildings, not a forecast.
Does Glendora flood?
Flood insurance has paid 8 claims in Glendora since 1980, $239K in all, or 0.5 per 1,000 homes, fewer than 90% of U.S. towns with a flood insurance record. The most claims came from Pineapple Express - Southern (1).
Is Glendora in a flood zone?
Flood zones are drawn street by street, so the answer depends on the address: look it up on FEMA’s flood map. In Los Angeles County, 33% of homes in mapped flood zones carry federal flood insurance, and 0.5% of all homes do.
How much is flood insurance in Glendora?
FEMA’s Community Rating System list shows no discount for Glendora’s flood program. Premiums depend on the building; policies usually start 30 days after you buy, so get a quote early.
What was the biggest storm in Glendora?
By FEMA money that reached Glendora, Severe Winter Storms, Flooding, and Mudslides (2017): $109K to the City of Glendora for repairs. By flood claims, Pineapple Express - Southern: 1 paid, $3K.
Is Glendora at risk from river and rain flooding?
It is the largest share of the building damage FEMA expects here (49%), and Glendora’s rate for it is in the top 9% of U.S. census tracts.
Storm stories
Memories, warnings and help from neighbors in Glendora.
Sources: FEMA National Risk Index v1.20 (December 2025), census-tract table, combined by where Glendora’s residents lived in the 2020 census; 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. Homes: Census ACS 2020–24. Preparedness tips: Ready.gov. FEMA’s model is an average of expected damage, not a forecast. How hazard risk is graded.