Casa Grande, Arizona Flood Zones
Last updated: March 2026
Casa Grande lies in the Sonoran Desert lowlands of Pinal County where monsoon storms produce sheet flooding across flat terrain. The Santa Cruz Wash and numerous unnamed desert washes convey flash floods through the city with little warning.
Pinal County has recorded 150 NFIP flood insurance claims since 1978, totaling $3.4M in payouts. Explore the full NFIP claims data by state and county to see how this area compares nationally.
FEMA Region
Region 9
NFIP Policies
961
Pinal County
Avg. Premium
$792/yr
Pinal County
FEMA Flood Risk Profile: Pinal County
Based on FEMA's National Risk Index, which evaluates flood risk at the county level using historical loss data, exposure, and vulnerability.
Inland Flood Risk
Relatively HighEst. annual loss: $92.4M
Hurricane Risk
Very LowEst. annual loss: $5K
Source: FEMA National Risk Index, county-level assessment. Individual property risk may vary.
Federal Flood Disaster History: Pinal County
Pinal County has been included in 7 federal flood-related disaster declarations.
These declarations affected communities across Pinal County, including Casa Grande.
Source: OpenFEMA Disaster Declarations Summaries API. Data sourced February 2026.
NFIP Flood Insurance Claims: Pinal County
Properties in Pinal County have filed 150 NFIP flood insurance claims totaling $3.4M in payouts since 1978. The average claim payout is $23K.
Highest-Claim Years
1983
18 claims - $306K
2013
10 claims - $98K
1993
9 claims - $146K
Claims by Flood Zone
Source: OpenFEMA NFIP Claims API. Data sourced March 2026. See national claims data.
Flood Insurance Coverage: Pinal County
An estimated 0.6% of households in Pinal County carry NFIP flood insurance. This county has elevated flood risk but very low insurance coverage, indicating a significant protection gap.
Penetration Rate
0.6%
Claims Ratio
1 in 6
policies have filed a claim
Avg. Claim Payout
$22,953
Derived from FEMA NRI population data and OpenFEMA NFIP policy/claims records.
Repetitive Loss Properties: Pinal County
Pinal County has 6 properties with multiple flood losses, including 0 severe repetitive loss properties.
Multiple Loss
6
Severe Rep. Loss
0
Mitigated
0
By Flood Zone
Source: OpenFEMA NFIP Multiple Loss Properties. Data sourced March 2026.
Recorded Flood Events: PINAL County
NOAA has recorded 157 flood events in PINAL County since 1996, causing $16.1M in damage and 5 deaths.
Costliest Events
Events by Type
Source: NOAA Storm Events Database, 1996-2026. Data sourced March 2026.
Flood Mitigation: Pinal County
FEMA has funded mitigation for 12 properties in Pinal County, investing $0 in flood risk reduction.
By Action Type
Source: OpenFEMA Hazard Mitigation Assistance. Data sourced March 2026.
What Your Flood Zone Means in Casa Grande
Casa Grande is vulnerable to flash flooding, where intense rainfall overwhelms drainage systems and sends water rushing through streets, arroyos, or low-lying areas within minutes. Unlike river flooding, flash floods arrive with little warning and can be deadly in urban areas and desert terrain. The most common FEMA flood zone designations in Casa Grande are Zone AE, Zone AO, Zone X. FEMA's National Risk Index estimates the county's annual expected loss from inland flooding at over $92.4M. Casa Grande has Zone AO areas subject to sheet-flow flooding, where shallow water spreads across broad, flat terrain rather than channeling through waterways.
Flash flood risk is difficult to predict by zone alone because intense localized rainfall can flood areas outside mapped SFHA boundaries. Under Risk Rating 2.0, FEMA accounts for distance to water, drainage characteristics, and rainfall intensity, not just the flood zone line on a map. If your property is in a Special Flood Hazard Area (SFHA) and you have a federally regulated or government-backed mortgage, federal law generally requires your lender to ensure you carry flood insurance.
Flash flood zone boundaries may shift when FEMA updates its stormwater drainage studies or when new development changes runoff patterns. Urbanization, in particular, increases impervious surface area and can expand flood risk into previously unaffected neighborhoods. Use our free lookup tool to check the current flood zone for any Casa Grande address.
Flood Insurance Discount: Casa Grande
Casa Grande participates in FEMA's Community Rating System (CRS), a voluntary program that rewards communities for flood mitigation efforts beyond minimum NFIP requirements. Residents in the Special Flood Hazard Area may qualify for reduced flood insurance premiums.
CRS Class
Class 8
SFHA Premium Discount
10% off
CRS classes range from 1 (best) to 10 (no discount). Casa Grande's Class 8 rating means NFIP policyholders in the SFHA can receive up to a 10% discount on their flood insurance premiums. Properties outside the SFHA may receive a 5% discount.
Source: FEMA Community Rating System, October 2025. Discounts apply to NFIP policies only.
Casa Grande, AZ Flood Zone FAQ
What flood zones are in Casa Grande, AZ?
The most common FEMA flood zones in Casa Grande are Zone AE, Zone AO, Zone X. Properties in these high-risk zones (SFHA) may require flood insurance with a federally regulated or government-backed mortgage.
Is flood insurance required in Casa Grande?
If your Casa Grande property is in a Special Flood Hazard Area (SFHA) and you have a federally regulated or government-backed mortgage, federal law generally requires your lender to ensure you carry flood insurance. Properties in Zone X are not federally required to carry flood insurance, though coverage is still recommended since over 40% of all NFIP flood claims come from Zone X properties.
How do I check my flood zone in Casa Grande?
Enter your Casa Grande address in the search tool above for an instant flood zone determination. Results include your FEMA flood zone, SFHA status, base flood elevation (if available), and FIRM panel information, pulled directly from FEMA's National Flood Hazard Layer.
Does Casa Grande offer flood insurance discounts?
Yes. Casa Grande participates in FEMA's Community Rating System (CRS) with a Class 8 rating, qualifying residents in the Special Flood Hazard Area for up to a 10% discount on NFIP flood insurance premiums. Properties outside the SFHA may receive a 5% discount.
Has Casa Grande experienced major flooding events?
Pinal County, where Casa Grande is located, has been part of 7 federal disaster declarations for flooding, hurricanes, or severe storms. The most recent was Hurricane Katrina Evacuation in 2005. Federal disaster declarations are issued when flooding overwhelms local resources and triggers FEMA assistance programs.
How many flood insurance claims have been filed in Casa Grande?
Pinal County has recorded 150 NFIP flood insurance claims totaling $3.4M in payouts since 1978. The year with the most claims was 1983, with 18 claims and $306K in payouts. These figures cover all NFIP claims in the county, including Casa Grande.
How many flood insurance policies are active in Casa Grande?
Pinal County currently has 961 active NFIP flood insurance policies with an average annual premium of $792. The most policies are in Zone AE (370 policies). These figures cover all active NFIP policies in the county.
How many Casa Grande properties have flooded repeatedly?
Pinal County has 6 properties with multiple flood losses on record, including 0 severe repetitive loss properties. These are properties that have experienced four or more NFIP claims of $5,000+ or two claims exceeding the building value.
Can my Casa Grande property be removed from a high-risk flood zone?
Yes, if your property's natural ground elevation is above the Base Flood Elevation and FEMA inadvertently mapped it in a high-risk zone, you can apply for a Letter of Map Amendment (LOMA). A successful LOMA removes the property from the Special Flood Hazard Area, generally eliminating the federal mandatory flood insurance requirement. You will need an elevation certificate from a licensed surveyor. If a property was raised above the BFE with fill material, the process is a LOMR-F rather than a LOMA.
What is Base Flood Elevation in Casa Grande?
Base Flood Elevation (BFE) is the predicted height of floodwaters during a 1% annual chance (100-year) flood, shown on FEMA maps as an elevation number in feet above sea level. In Casa Grande's Zone AE areas, BFE lines appear on the FIRM as wavy contours labeled with elevation values. Properties with a lowest floor at or above the BFE typically qualify for significantly lower NFIP flood insurance premiums.
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Disclaimer: Flood risk data on this page is sourced from FEMA datasets including the National Risk Index, NFIP claims and policy records, disaster declarations, and the Community Rating System. These datasets were last extracted on March 2026 and may not reflect the most recent changes. This page is for informational purposes only and is not a certified flood zone determination. Always verify current flood zone status through FEMA or a licensed determination provider before making property, insurance, or lending decisions.