On FEMA’s figures, Norris Canyon faces more hazard damage per building than 97% of U.S. towns, mostly from river and rain flooding
On FEMA’s National Risk Index, Norris Canyon gets a D− for hazard risk: higher expected damage per building than 97% of U.S. towns. Most of that expected damage is river and rain flooding (60%), then earthquakes (36%). Flood insurance has paid 1 claim here since 2022.
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 Norris Canyon 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 Norris Canyon’s grade
River and rain flooding is 60% of the building damage FEMA expects in Norris Canyon, and Norris Canyon’s rate of river and rain flooding damage is in the top 4% of U.S. census tracts. Earthquakes add 36%, at a rate in the top 6% of U.S. census tracts.
D− higher expected damage per building than 97% of U.S. towns (21,298).
Norris Canyon’s residents live in 2 census tracts; FEMA’s figures are combined by where they live.
In dollars, FEMA expects about $891K a year in losses across Norris Canyon: $798K to buildings, the rest to people and crops.
Does Norris Canyon flood? Rarely: 1 flood claim since 2022
Every paid claim on a federal flood insurance policy in Norris Canyon, from FEMA’s records: 2.6 per 1,000 homes, fewer than 55% of the 13,809 U.S. towns with a flood insurance record.
- The California Atmospheric River1 claim · $159K
Norris Canyon isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.
Insurance rates: Contra Costa County.The storms Norris Canyon remembers
None of the 17 disasters declared for Contra Costa County shows FEMA aid or repair money reaching Norris Canyon itself in FEMA’s records, so these are its biggest flood-claim years.
- 20221 flood claims paidThe year of Severe Winter Storms, Flooding, Landslides, and Mudslides, declared for Contra Costa County
Contra Costa County has had 17 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 Norris Canyon after a storm or flood belong in the town’s history. Add one, or share what you remember below.
Add to the Norris Canyon archive →Norris Canyon and its neighbors
Norris Canyon is 2nd of the 2 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 |
|---|---|---|---|
| San Ramon | D−more damage than 96% | river and rain flooding | 15 |
| Norris Canyon | D−more damage than 97% | river and rain flooding | 1 |
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 Norris Canyon 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 Norris Canyon
Is Norris Canyon at risk for natural disasters?
On FEMA’s National Risk Index, Norris Canyon has higher expected damage per building than 97% of U.S. towns: D− for hazard risk. Most of the expected damage is river and rain flooding (60%) and earthquakes (36%). This is FEMA’s model of an average year for today’s buildings, not a forecast.
Does Norris Canyon flood?
Flood insurance has paid 1 claim in Norris Canyon since 2022, $159K in all, or 2.6 per 1,000 homes, fewer than 55% of U.S. towns with a flood insurance record. The most claims came from California Atmospheric River (1).
Is Norris Canyon 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 Contra Costa County, 28% of homes in mapped flood zones carry federal flood insurance, and 0.9% of all homes do.
How much is flood insurance in Norris Canyon?
FEMA’s Community Rating System list shows no discount for Norris Canyon’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 Norris Canyon?
By flood claims, California Atmospheric River: 1 paid, $159K.
Is Norris Canyon at risk from river and rain flooding?
It is the largest share of the building damage FEMA expects here (60%), and Norris Canyon’s rate for it is in the top 4% of U.S. census tracts.
Storm stories
Memories, warnings and help from neighbors in Norris Canyon.
Sources: FEMA National Risk Index v1.20 (December 2025), census-tract table, combined by where Norris Canyon’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.