Martinez Historical District · Photo: JERRYE & ROY KLOTZ, M.D. · CC BY-SA 4.0More hazard damage per building is expected in Oasis than in 94% of U.S. towns, mostly from earthquakes
On FEMA’s National Risk Index, Oasis gets a D for hazard risk: higher expected damage per building than 94% of U.S. towns, #495 of 847 in California. Most of that expected damage is earthquakes (52%), then river and rain flooding (41%). FEMA’s files show no paid flood insurance claims here.
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 Oasis faces
Each hazard’s share of the building damage FEMA expects here, and how its rate compares with the rest of the country.
Earthquakes
River and rain flooding
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 Oasis’ grade
Earthquakes are 52% of the building damage FEMA expects in Oasis, and Oasis’ rate of earthquakes damage is in the top 4% of U.S. census tracts. Wildfire adds 6%, at a rate in the top 4% of U.S. census tracts.
D #495 of 847 in California; higher expected damage per building than 94% of U.S. towns (21,298).
Oasis’ residents live in 3 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, Oasis has more expected damage per building than 58% of California towns.
In dollars, FEMA expects about $4.2M a year in losses across Oasis: $2.4M to buildings, the rest to people and crops.
Does Oasis flood? No paid flood claims on record
FEMA’s records show no paid flood insurance claims in Oasis. That’s not a promise: most homes don’t carry flood insurance, so small floods go unrecorded.
Oasis 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.The storms Oasis remembers
None of the 33 disasters declared for Riverside County shows FEMA aid or repair money reaching Oasis itself in FEMA’s records, so these are its biggest flood-claim years.
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.
Get ready for what Oasis faces
A short kit for the hazards that drive the building damage here, what to check before you buy, and where neighbors get alerts.
- Drop, cover and hold on.
- Strap tall furniture and the water heater to the wall.
- Know how to shut off the gas.
- 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.
- 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 Oasis
Is Oasis at risk for natural disasters?
On FEMA’s National Risk Index, Oasis has higher expected damage per building than 94% of U.S. towns: D for hazard risk, #495 of 847 in California. Most of the expected damage is earthquakes (52%) and river and rain flooding (41%). This is FEMA’s model of an average year for today’s buildings, not a forecast.
Is Oasis 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 Oasis?
FEMA’s Community Rating System list shows no discount for Oasis’ flood program. Premiums depend on the building; policies usually start 30 days after you buy, so get a quote early.
Is Oasis at risk from earthquakes?
It is the largest share of the building damage FEMA expects here (52%), and Oasis’ rate for it is in the top 4% of U.S. census tracts.
Storm stories
Memories, warnings and help from neighbors in Oasis.
Sources: FEMA National Risk Index v1.20 (December 2025), census-tract table, combined by where Oasis’ 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.