Photo: Allie_Caulfield · CC BY 2.0FEMA puts Arroyo Grande’s expected hazard damage per building above that of 89% of U.S. towns, mostly from river and rain flooding
On FEMA’s National Risk Index, Arroyo Grande gets a D for hazard risk: higher expected damage per building than 89% of U.S. towns, #294 of 847 in California. Most of that expected damage is river and rain flooding (77%), then earthquakes (22%). Flood insurance has paid 25 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 Arroyo Grande 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 Arroyo Grande’s grade
River and rain flooding is 77% of the building damage FEMA expects in Arroyo Grande, and Arroyo Grande’s rate of river and rain flooding damage is in the top 8% of U.S. census tracts. Wildfire adds 2%, at a rate in the top 10% of U.S. census tracts.
D #294 of 847 in California; higher expected damage per building than 89% of U.S. towns (21,298).
Arroyo Grande’s residents live in 5 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, Arroyo Grande has less expected damage per building than 65% of California towns.
In dollars, FEMA expects about $11.5M a year in losses across Arroyo Grande: $10.7M to buildings, the rest to people and crops.
Does Arroyo Grande flood? Sometimes: 25 flood claims since 1978
Every paid claim on a federal flood insurance policy in Arroyo Grande, from FEMA’s records: 3.1 per 1,000 homes, fewer than 51% of the 13,809 U.S. towns with a flood insurance record.
- The California Atmospheric River6 claims · $382K
- The Pineapple Express - Southern1 claim · $1K
Arroyo Grande isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.
Insurance rates: San Luis Obispo County.7 federal disasters brought FEMA money to Arroyo Grande
Disasters that paid out in Arroyo Grande itself (aid to households or repair grants to the City of Arroyo Grande), newest first, with that year’s flood claims.
- 2023Severe Winter Storms, Straight-line Winds, Flooding, Landslides, and Mudslides26 households applied for aid$74K aid approved6 flood claims paid that year
- 2022Severe Winter Storms, Flooding, Landslides, and Mudslides168 households applied for aid$698K aid approved$304K to the City of Arroyo Grande for repairs
- 2017Severe Winter Storms, Flooding, and Mudslides$59K to the City of Arroyo Grande for repairs
- 2017Severe Winter Storms, Flooding, and Mudslides$3K to the City of Arroyo Grande for repairs
- 2017Severe Winter Storms, Flooding, and Mudslides$20K to the City of Arroyo Grande for repairs
- 2010Severe Winter Storms, Flooding, and Debris and Mud Flows$28K to the City of Arroyo Grande for repairs
Show all 7
- 2003Earthquake73 households applied for aid$142K aid approved$17K to the City of Arroyo Grande for repairs
San Luis Obispo County has had 23 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 1 FEMA wildfire suppression grant (Fire Management Assistance, not a disaster declaration) for fires in San Luis Obispo County, 2016–2016.
Old photos of Arroyo Grande after a storm or flood belong in the town’s history. Add one, or share what you remember below.
Add to the Arroyo Grande archive →Arroyo Grande and its neighbors
Arroyo Grande is 4th of the 4 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 |
|---|---|---|---|
| Grover Beach | C−more damage than 85% | river and rain flooding | 3 |
| Pismo Beach | Dmore damage than 86% | river and rain flooding | 8 |
| Oceano | Dmore damage than 88% | river and rain flooding | 2 |
| Arroyo Grande | Dmore damage than 89% | river and rain flooding | 25 |
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 Arroyo Grande 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 Arroyo Grande
Is Arroyo Grande at risk for natural disasters?
On FEMA’s National Risk Index, Arroyo Grande has higher expected damage per building than 89% of U.S. towns: D for hazard risk, #294 of 847 in California. Most of the expected damage is river and rain flooding (77%) and earthquakes (22%). This is FEMA’s model of an average year for today’s buildings, not a forecast.
Does Arroyo Grande flood?
Flood insurance has paid 25 claims in Arroyo Grande since 1978, $794K in all, or 3.1 per 1,000 homes, fewer than 51% of U.S. towns with a flood insurance record. 3 properties have flooded more than once. The most claims came from California Atmospheric River (6).
Is Arroyo Grande 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 San Luis Obispo County, 22% of homes in mapped flood zones carry federal flood insurance, and 1.1% of all homes do.
How much is flood insurance in Arroyo Grande?
FEMA’s Community Rating System list shows no discount for Arroyo Grande’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 Arroyo Grande?
By FEMA money that reached Arroyo Grande, Severe Winter Storms, Flooding, Landslides, and Mudslides (2022): 168 households applied for aid, $698K approved, and $304K to the City of Arroyo Grande for repairs. By flood claims, California Atmospheric River: 6 paid, $382K.
Is Arroyo Grande at risk from river and rain flooding?
It is the largest share of the building damage FEMA expects here (77%), and Arroyo Grande’s rate for it is in the top 8% of U.S. census tracts.
Storm stories
Memories, warnings and help from neighbors in Arroyo Grande.
Sources: FEMA National Risk Index v1.20 (December 2025), census-tract table, combined by where Arroyo Grande’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.