Photo: FredBren · Public domainFEMA puts Corona’s expected hazard damage per building above that of 96% of U.S. towns, mostly from river and rain flooding
On FEMA’s National Risk Index, Corona gets a D− for hazard risk: higher expected damage per building than 96% of U.S. towns, #612 of 847 in California. Most of that expected damage is river and rain flooding (60%), then earthquakes (35%). Flood insurance has paid 49 claims here since 1978.
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 Corona 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
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 Corona’s grade
River and rain flooding is 60% of the building damage FEMA expects in Corona, and Corona’s rate of river and rain flooding damage is in the top 5% of U.S. census tracts. Earthquakes add 35%, at a rate in the top 7% of U.S. census tracts.
D− #612 of 847 in California; higher expected damage per building than 96% of U.S. towns (21,298).
Corona’s residents live in 39 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, Corona has more expected damage per building than 72% of California towns.
Among the 400 U.S. cities of 100,000 or more, Corona has higher expected damage per building than 93% (#372 of 400). Because it is so big, its total expected yearly loss, $117M, is the 92th largest of those 400.
Does Corona flood? Sometimes: 49 flood claims since 1978
Every paid claim on a federal flood insurance policy in Corona, from FEMA’s records: 1.0 per 1,000 homes, fewer than 79% of the 13,809 U.S. towns with a flood insurance record.
Corona isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.
Insurance rates: Riverside County.8 federal disasters brought FEMA money to Corona
Disasters that paid out in Corona itself (aid to households or repair grants to the City of Corona), newest first, with that year’s flood claims.
- 2019Severe Winter Storms, Flooding, Landslides, and Mudslides$532K to the City of Corona for repairs
- 2017Severe Winter Storms, Flooding, and Mudslides$49K to the City of Corona for repairs
- 2010Severe Winter Storms, Flooding, and Debris and Mud Flows$130K to the City of Corona for repairs
- 2010Severe Winter Storms, Flooding, and Debris and Mud Flows$133K to the City of Corona for repairs
- 2008Wildfires24 households applied for aid$23K aid approved$60K to the City of Corona for repairs
- 2007Wildfires, Flooding, Mud Flows, and Debris Flows4 households applied for aid$39K to the City of Corona for repairs
Show all 8
- 2004Severe Storms, Flooding, Debris Flows, and Mudslides29 households applied for aid$20K aid approved$139K to the City of Corona for repairs
- 2003Wildfires, Flooding, Mudflow and Debris Flow Directly Related T45 households applied for aid$6K aid approved
Riverside County has had 33 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 30 FEMA wildfire suppression grants (Fire Management Assistance, not a disaster declaration) for fires in Riverside County, 2003–2026.
Old photos of Corona after a storm or flood belong in the town’s history. Add one, or share what you remember below.
Add to the Corona archive →Corona and its neighbors
Corona is 6th of the 9 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 |
|---|---|---|---|
| El Cerrito | Dmore damage than 92% | river and rain flooding | 3 |
| El Sobrante | Dmore damage than 92% | river and rain flooding | — |
| Home Gardens | Dmore damage than 95% | river and rain flooding | — |
| Norco | D−more damage than 96% | river and rain flooding | 15 |
| Temescal Valley | D−more damage than 96% | river and rain flooding | — |
| Corona | D−more damage than 96% | river and rain flooding | 49 |
| Riverside | D−more damage than 96% | river and rain flooding | 31 |
| Chino Hills | D−more damage than 98% | river and rain flooding | 1 |
| Coronita | D−among the highest damage | river and rain flooding | — |
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 Corona 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.
- 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 Corona
Is Corona at risk for natural disasters?
On FEMA’s National Risk Index, Corona has higher expected damage per building than 96% of U.S. towns: D− for hazard risk, #612 of 847 in California. Most of the expected damage is river and rain flooding (60%) and earthquakes (35%). This is FEMA’s model of an average year for today’s buildings, not a forecast.
Does Corona flood?
Flood insurance has paid 49 claims in Corona since 1978, $1.2M in all, or 1.0 per 1,000 homes, fewer than 79% of U.S. towns with a flood insurance record. 9 properties have flooded more than once.
Is Corona 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 Riverside County, 16% of homes in mapped flood zones carry federal flood insurance, and 0.5% of all homes do.
How much is flood insurance in Corona?
FEMA’s Community Rating System list shows no discount for Corona’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 Corona?
By FEMA money that reached Corona, Severe Winter Storms, Flooding, Landslides, and Mudslides (2019): $532K to the City of Corona for repairs.
Is Corona at risk from river and rain flooding?
It is the largest share of the building damage FEMA expects here (60%), and Corona’s rate for it is in the top 5% of U.S. census tracts.
Storm stories
Memories, warnings and help from neighbors in Corona.
Sources: FEMA National Risk Index v1.20 (December 2025), census-tract table, combined by where Corona’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.