FEMA expects more hazard damage per building in East Sonora than in 85% of U.S. towns, mostly from wildfire
On FEMA’s National Risk Index, East Sonora gets a C− for hazard risk: higher expected damage per building than 85% of U.S. towns, #223 of 847 in California. Most of that expected damage is wildfire (56%), then river and rain flooding (42%). Flood insurance has paid 1 claim here since 2023.
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 East Sonora faces
Each hazard’s share of the building damage FEMA expects here, and how its rate compares with the rest of the country.
Wildfire
River and rain flooding
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 East Sonora’s grade
Wildfire is 56% of the building damage FEMA expects in East Sonora, and East Sonora’s rate of wildfire damage is in the top 1% of U.S. census tracts. Next is river and rain flooding at 42% (higher than 59% of U.S. census tracts).
C− #223 of 847 in California; higher expected damage per building than 85% of U.S. towns (21,298).
All of East Sonora’s residents live in one census tract; the figures are that tract’s.
The typical California town has higher expected damage than 92% of U.S. towns; within the state, East Sonora has less expected damage per building than 74% of California towns.
In dollars, FEMA expects about $2.7M a year in losses across East Sonora: $2.5M to buildings, the rest to people and crops.
Does East Sonora flood? Rarely: 1 flood claim since 2023
Every paid claim on a federal flood insurance policy in East Sonora, from FEMA’s records: 0.7 per 1,000 homes, fewer than 85% of the 13,809 U.S. towns with a flood insurance record.
- The California Atmospheric River1 claim · $38K
East Sonora isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.
Insurance rates: Tuolumne County.The storms East Sonora remembers
None of the 16 disasters declared for Tuolumne County shows FEMA aid or repair money reaching East Sonora itself in FEMA’s records, so these are its biggest flood-claim years.
- 20231 flood claims paidThe year of Severe Winter Storms, Flooding, Landslides, and Mudslides, declared for Tuolumne County
Tuolumne County has had 16 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 2 FEMA wildfire suppression grants (Fire Management Assistance, not a disaster declaration) for fires in Tuolumne County, 2013–2026.
Old photos of East Sonora after a storm or flood belong in the town’s history. Add one, or share what you remember below.
Add to the East Sonora archive →East Sonora and its neighbors
East Sonora is 2nd of the 3 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 |
|---|---|---|---|
| Sonora | C−more damage than 77% | river and rain flooding | 6 |
| East Sonora | C−more damage than 85% | wildfire | 1 |
| Phoenix Lake | D−more damage than 96% | 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 East Sonora faces
A short kit for the hazards that drive the building damage here, what to check before you buy, and where neighbors get alerts.
- 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.
- 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.
- 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 East Sonora
Is East Sonora at risk for natural disasters?
On FEMA’s National Risk Index, East Sonora has higher expected damage per building than 85% of U.S. towns: C− for hazard risk, #223 of 847 in California. Most of the expected damage is wildfire (56%) and river and rain flooding (42%). The figures are for the one census tract the town shares with its neighbors. This is FEMA’s model of an average year for today’s buildings, not a forecast.
Does East Sonora flood?
Flood insurance has paid 1 claim in East Sonora since 2023, $38K in all, or 0.7 per 1,000 homes, fewer than 85% of U.S. towns with a flood insurance record. The most claims came from California Atmospheric River (1).
Is East Sonora 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 Tuolumne County, 24% of homes in mapped flood zones carry federal flood insurance, and 0.1% of all homes do.
How much is flood insurance in East Sonora?
FEMA’s Community Rating System list shows no discount for East Sonora’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 East Sonora?
By flood claims, California Atmospheric River: 1 paid, $38K.
Is East Sonora at risk from wildfire?
It is the largest share of the building damage FEMA expects here (56%), and East Sonora’s rate for it is in the top 1% of U.S. census tracts.
Storm stories
Memories, warnings and help from neighbors in East Sonora.
Sources: FEMA National Risk Index v1.20 (December 2025), census-tract table, combined by where East Sonora’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.