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Casa Grande-Casa Grande Union High School-1920-2Photo: Tony the Marine · CC BY-SA 3.0
B−Hazard risk
Natural hazards in Casa Grande · FEMA

On FEMA’s figures, Casa Grande faces about as much hazard damage per building as the typical U.S. town, mostly from river and rain flooding

On FEMA’s National Risk Index, Casa Grande gets a B− for hazard risk: lower expected damage per building than 50% of U.S. towns, #29 of 140 in Arizona. Most of that expected damage is river and rain flooding (93%). Flood insurance has paid 8 claims here since 1979.

River and rain flooding 93%Wildfire 2%Earthquakes 2%

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

less than 50%of U.S. townsLess damageMoreExpected yearly damage per dollar of building, vs. the 21,298 U.S. towns we grade#29 of 140 in Arizona
Hazard risk
B−#29 of 140
in Arizona · lower than 50% of U.S. towns
Main hazard
River and rain flooding
93% of expected building damage
Flood claims
8
paid since 1979 · $211K
Flood insurance
10% off
Community discount (class 8)
By hazard

What Casa 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

93%of expected building damage
Above average · higher than 74% of U.S. census tracts
Recorded about 4 times a year in the area
Smaller shares here
 Wildfire Earthquakes Hail Strong wind Tornadoes Lightning Hurricanes Winter storms Heat waves Landslides
FEMA models no building damage here
Coastal floodingIce stormsCold wavesAvalanchesTsunamisVolcanic activity
People, not buildings.Counting harm to people as well as buildings, FEMA’s model puts heat waves at 22% of Casa Grande’s expected losses. Heat waves do little damage to buildings (0.0%), so they aren’t part of the grade.

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.

Flood risk changes street by street. Check a specific address on FEMA’s flood map, and ask about flood insurance before you buy.
Hazard risk grade

What’s behind Casa Grande’s grade

River and rain flooding is 93% of the building damage FEMA expects in Casa Grande, and Casa Grande’s rate of river and rain flooding damage is higher than 74% of U.S. census tracts.

Where Casa Grande sits
Casa Grande
Least damageMiddleMost damage

B− #29 of 140 in Arizona; lower expected damage per building than 50% of U.S. towns (21,298).

Casa Grande’s residents live in 18 census tracts; FEMA’s figures are combined by where they live.

What drives the damage to buildings
River and rain flooding93%Everything else7%

The typical Arizona town has higher expected damage than 78% of U.S. towns; within the state, Casa Grande has less expected damage per building than 80% of Arizona towns.

In dollars, FEMA expects about $14.6M a year in losses across Casa Grande: $10.6M to buildings, the rest to people and crops.

A firm figure. It combines 18 census tracts by where Casa Grande’s residents live. FEMA’s model is an average year for today’s buildings, not a record: the claims and disasters below are the record.

How TownRatings grades hazard risk →

Flood insurance claims

Does Casa Grande flood? Rarely: 8 flood claims since 1979

Every paid claim on a federal flood insurance policy in Casa Grande, from FEMA’s records: 0.3 per 1,000 homes, fewer than 94% of the 13,809 U.S. towns with a flood insurance record.

Paid flood claims, by year
1979: 1 claim1980: 1 claim1981: 0 claims1982: 0 claims1983: 1 claim1984: 0 claims1985: 0 claims1986: 0 claims1987: 0 claims1988: 0 claims1989: 0 claims1990: 0 claims1991: 0 claims1992: 0 claims1993: 0 claims1994: 0 claims1995: 0 claims1996: 1 claim1997: 0 claims1998: 1 claim1999: 1 claim2000: 0 claims2001: 0 claims2002: 0 claims2003: 0 claims2004: 0 claims2005: 0 claims2006: 0 claims2007: 0 claims2008: 0 claims2009: 0 claims2010: 0 claims2011: 0 claims2012: 0 claims2013: 0 claims2014: 0 claims2015: 0 claims2016: 0 claims2017: 2 claims2018: 0 claims2019: 0 claims2020: 0 claims2021: 0 claims2022: 0 claims2023: 0 claims2024: 0 claims2025: 0 claims2026: 0 claims197919802017
19792026
8
paid claims since 1979
$211K
paid to owners
0
homes flooded more than once
$26K
average claim
of homes in flood zones are insured
of all homes are insured
Community discount10% off flood insurance

Casa Grande is in FEMA’s Community Rating System (class 8) for its flood-proofing work.

Insurance rates: Pinal County.
Disasters

The storms Casa Grande remembers

None of the 10 disasters declared for Pinal County shows FEMA aid or repair money reaching Casa Grande itself in FEMA’s records, so these are its biggest flood-claim years.

  1. 20172 flood claims paidNo declaration for the county that year
  2. 19791 flood claims paidNo declaration for the county that year
  3. 19801 flood claims paidNo declaration for the county that year
Disasters declared, by decade
Paid out in Casa GrandePinal County only

Pinal County has had 10 natural disasters declared by the President since 1953, most often floods, then severe storms. Not counted: the 2005 Hurricane Katrina evacuee emergency, which covered counties that took in evacuees.

Also 10 FEMA wildfire suppression grants (Fire Management Assistance, not a disaster declaration) for fires in Pinal County, 2002–2025.

Were you here?

Old photos of Casa Grande after a storm or flood belong in the town’s history. Add one, or share what you remember below.

Add to the Casa Grande archive →
Next door

Casa Grande and its neighbors

Casa Grande is 2nd of the 3 graded towns here, from least expected damage per building to most. Tap a town to see its hazards.

Eloy: hazard risk B+Maricopa: hazard risk DEloyMaricopaCasa Grande
Lowest fifthSecondMiddleFourthHighest fifth
TownHazard riskMostly (buildings)Flood claims
EloyB+less damage than 73%river and rain flooding3
Casa GrandeB−less damage than 50%river and rain flooding8
MaricopaDmore damage than 86%river and rain flooding1

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.

Be ready

Get ready for what Casa 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.

When the river rises
  • 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.
More from Ready.gov ↗
Before you buy or rent
  • 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.
  • Casa Grande residents get 10% off flood insurance.
When a storm is coming
Forecast and alertsWeather →911, the nearest ERSafety →

Know where neighbors sign up for alerts? Add it to the Handbook so everyone has it.

Questions about natural hazards in Casa Grande

Is Casa Grande at risk for natural disasters?

On FEMA’s National Risk Index, Casa Grande has lower expected damage per building than 50% of U.S. towns: B− for hazard risk, #29 of 140 in Arizona. Most of the expected damage is river and rain flooding (93%). This is FEMA’s model of an average year for today’s buildings, not a forecast.

Does Casa Grande flood?

Flood insurance has paid 8 claims in Casa Grande since 1979, $211K in all, or 0.3 per 1,000 homes, fewer than 94% of U.S. towns with a flood insurance record.

Is Casa 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 Pinal County, 21% of homes in mapped flood zones carry federal flood insurance, and 0.5% of all homes do.

How much is flood insurance in Casa Grande?

Casa Grande is in FEMA’s Community Rating System (class 8), which takes 10% off federal flood insurance policies for its flood-proofing work. Premiums depend on the building; policies usually start 30 days after you buy, so get a quote early.

Is Casa Grande at risk from river and rain flooding?

It is the largest share of the building damage FEMA expects here (93%), and Casa Grande’s rate for it is higher than 74% of U.S. census tracts.

Storm stories

Memories, warnings and help from neighbors in Casa Grande.

Town Square →
Start the conversation

Sources: FEMA National Risk Index v1.20 (December 2025), census-tract table, combined by where Casa 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.