Ann Arbor, MI Flood Zone Lookup
Last updated: March 2026
Ann Arbor faces flooding from the Huron River and its tributaries. Urban development around the University of Michigan has increased impervious surfaces and stormwater runoff.
Washtenaw County has recorded 132 NFIP flood insurance claims since 1978, totaling $1.6M in payouts. Explore the full NFIP claims data by state and county to see how this area compares nationally.
FEMA Region
Region 5
NFIP Policies
687
Washtenaw County
Avg. Premium
$558/yr
Washtenaw County
FEMA Flood Risk Profile: Washtenaw 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 ModerateEst. annual loss: $46.6M
Hurricane Risk
Very LowEst. annual loss: $73K
Source: FEMA National Risk Index, county-level assessment. Individual property risk may vary.
Federal Flood Disaster History: Washtenaw County
Washtenaw County has been included in 2 federal flood-related disaster declarations.
These declarations affected communities across Washtenaw County, including Ann Arbor.
Source: OpenFEMA Disaster Declarations Summaries API. Data sourced February 2026.
NFIP Flood Insurance Claims: Washtenaw County
Properties in Washtenaw County have filed 132 NFIP flood insurance claims totaling $1.6M in payouts since 1978. The average claim payout is $12K.
Highest-Claim Years
2011
19 claims - $228K
2010
14 claims - $80K
2001
13 claims - $121K
Claims by Flood Zone
Source: OpenFEMA NFIP Claims API. Data sourced March 2026. See national claims data.
Flood Insurance Coverage: Washtenaw County
Only roughly 1 in 214 households in Washtenaw County carries NFIP flood insurance (0.5% of estimated households). With 24 recorded flood events and $8.8M in damage, most flood losses in this county are likely uninsured.
Penetration Rate
0.5%
roughly 1 in 214 households
Historical Claims Ratio
1 in 5
132 claims over 45+ years across 687 current policies
Avg. Claim Payout
$12,364
Per claim, county-wide since 1978
Historically, Washtenaw County has averaged 1 claim for every 5 active policies (since 1978). This compares cumulative claims against today's policy count and does not predict future claim likelihood.
Coverage data: NFIP policies as of March 2026, claims since 1978 (March 2026), population from FEMA NRI. All figures are county-wide and include Ann Arbor.
What Your Flood Zone Means in Ann Arbor
Ann Arbor faces flood risk primarily from river and stream overflow during heavy rainfall, snowmelt, or upstream dam releases. When rivers exceed their banks, floodwaters spread across low-lying areas mapped in AE and A zones. The most common FEMA flood zone designations in Ann Arbor are Zone AE, Zone X. FEMA's National Risk Index estimates the county's annual expected loss from inland flooding at over $46.6M.
Riverine flood risk in Ann Arbor is driven by the proximity and elevation of properties relative to nearby waterways. Properties closer to rivers with lower ground elevations typically face higher flood insurance premiums under FEMA's Risk Rating 2.0. 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.
River flood maps can change when FEMA conducts new Flood Insurance Studies or when development alters drainage patterns. Letters of Map Amendment (LOMA) can remove individual properties if the natural ground elevation was always above the Base Flood Elevation and the property was inadvertently mapped in the SFHA. Use our free lookup tool to check the current flood zone for any Ann Arbor address.
Repetitive Loss Properties: Washtenaw County
Washtenaw County has 10 properties with multiple flood insurance losses, including 1 severe repetitive loss properties. Severe repetitive loss is a subset of multiple loss, not a separate count. Data sourced March 2026.
Multiple Loss
10
2+ claims within 10 years
Severe Repetitive Loss
1
4+ claims or 2 exceeding value
Mitigated
0
Received FEMA mitigation
By Flood Zone
Source: OpenFEMA NFIP Multiple Loss Properties. Data sourced March 2026.
Recorded Flood Events: Washtenaw County
NOAA has recorded 24 flood events in Washtenaw County since 1996, causing $8.8M in damage.
Costliest Events
Events by Type
Source: NOAA Storm Events Database, 1996-2026. Data sourced March 2026.
Flood Mitigation: Washtenaw County
FEMA has funded mitigation for 9 properties in Washtenaw County, investing $0 in flood risk reduction. Common mitigation actions include acquisition (buying and demolishing flood-prone structures), elevation (raising buildings above flood level), and safe rooms (wind/storm shelters for tornado and hurricane protection).
By Action Type
Source: OpenFEMA Hazard Mitigation Assistance. Data sourced March 2026.
Flood Insurance Discount: Ann Arbor
Ann Arbor 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 6
SFHA Premium Discount
20% off
CRS classes range from 1 (best) to 10 (no discount). Ann Arbor's Class 6 rating means NFIP policyholders in the SFHA can receive up to a 20% discount on their flood insurance premiums. Properties outside the SFHA may receive a 10% discount.
Source: FEMA Community Rating System, April 2026. Discounts apply to NFIP policies only.
Ann Arbor, MI Flood Zone FAQ
What flood zones are in Ann Arbor, MI?
The most common FEMA flood zones in Ann Arbor are Zone AE, 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 Ann Arbor?
If your Ann Arbor 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 Ann Arbor?
Enter your Ann Arbor 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 Ann Arbor offer flood insurance discounts?
Yes. Ann Arbor participates in FEMA's Community Rating System (CRS) with a Class 6 rating, qualifying residents in the Special Flood Hazard Area for up to a 20% discount on NFIP flood insurance premiums. Properties outside the SFHA may receive a 10% discount.
Has Ann Arbor experienced major flooding events?
Washtenaw County, where Ann Arbor is located, has been part of 2 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 Ann Arbor?
Washtenaw County has recorded 132 NFIP flood insurance claims totaling $1.6M in payouts since 1978. The year with the most claims was 2011, with 19 claims and $228K in payouts. These figures cover all NFIP claims in the county, including Ann Arbor.
How many flood insurance policies are active in Ann Arbor?
Washtenaw County currently has 687 active NFIP flood insurance policies with an average annual premium of $558. The most policies are in Zone AE (383 policies). These figures cover all active NFIP policies in the county.
How many Ann Arbor properties have flooded repeatedly?
Washtenaw County has 10 properties with multiple flood losses on record, including 1 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 Ann Arbor 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 Ann Arbor?
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 Ann Arbor'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.
Other Michigan Cities
Understanding Flood Zones
Look Up Any Ann Arbor, MI Address
Enter a Ann Arbor, MI address to instantly check its FEMA flood zone designation, SFHA status, and insurance requirements.
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.