Alta Mesa Farm Bureau Hall · Photo: Aaron A. Gallup · Public domainFEMA puts Wilton’s expected hazard damage per building above that of 82% of U.S. towns, mostly from river and rain flooding
On FEMA’s National Risk Index, Wilton gets a C− for hazard risk: higher expected damage per building than 82% of U.S. towns, #188 of 847 in California. Most of that expected damage is river and rain flooding (71%), then wildfire (18%). 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 stands out about Wilton’s natural hazards
From FEMA’s model and FEMA’s records, below.
What Wilton 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
Wildfire
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 Wilton’s grade
River and rain flooding is 71% of the building damage FEMA expects in Wilton, and Wilton’s rate of river and rain flooding damage is higher than 83% of U.S. census tracts. Wildfire adds 18%, at a rate in the top 3% of U.S. census tracts.
C− #188 of 847 in California; higher expected damage per building than 82% of U.S. towns (21,298).
Wilton’s residents live in 2 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, Wilton has less expected damage per building than 78% of California towns.
In dollars, FEMA expects about $4.1M a year in losses across Wilton: $3.1M to buildings, the rest to people and crops.
Does Wilton flood? No paid flood claims on record
FEMA’s records show no paid flood insurance claims in Wilton. That’s not a promise: most homes don’t carry flood insurance, so small floods go unrecorded.
Wilton isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.
Insurance rates: Sacramento County.2 federal disasters brought FEMA money to Wilton
Disasters that paid out in Wilton itself (aid to households or repair grants to Wilton), newest first, with that year’s flood claims.
- 2022Severe Winter Storms, Flooding, Landslides, and Mudslides191 households applied for aid$332K aid approved
- 2005Severe Storms, Flooding, Mudslides, and Landslides1 households applied for aid$491 aid approved
Sacramento County has had 19 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.
Old photos of Wilton after a storm or flood belong in the town’s history. Add one, or share what you remember below.
Add to the Wilton archive →Get ready for what Wilton 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.
- 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.
- 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 Wilton
Is Wilton at risk for natural disasters?
On FEMA’s National Risk Index, Wilton has higher expected damage per building than 82% of U.S. towns: C− for hazard risk, #188 of 847 in California. Most of the expected damage is river and rain flooding (71%) and wildfire (18%). This is FEMA’s model of an average year for today’s buildings, not a forecast.
Is Wilton 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 Sacramento County, 81% of homes in mapped flood zones carry federal flood insurance, and 9.6% of all homes do.
How much is flood insurance in Wilton?
FEMA’s Community Rating System list shows no discount for Wilton’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 Wilton?
By FEMA money that reached Wilton, Severe Winter Storms, Flooding, Landslides, and Mudslides (2022): 191 households applied for aid, $332K approved.
Is Wilton at risk from river and rain flooding?
It is the largest share of the building damage FEMA expects here (71%), and Wilton’s rate for it is higher than 83% of U.S. census tracts.
Storm stories
Memories, warnings and help from neighbors in Wilton.
Sources: FEMA National Risk Index v1.20 (December 2025), census-tract table, combined by where Wilton’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.