Ottawa, IL Flood Zone Lookup
Last updated: March 2026
Ottawa sits at the confluence of the Illinois and Fox rivers in LaSalle County, creating significant riverine flood exposure from two major waterways. The city holds a CRS Class 2 rating, one of the highest in the nation, reflecting decades of proactive floodplain management.
LaSalle County has recorded 679 NFIP flood insurance claims since 1978, totaling $12.2M 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
318
LaSalle County
Avg. Premium
$1,883/yr
LaSalle County
FEMA Flood Risk Profile: LaSalle 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: $33.1M
Hurricane Risk
Very LowEst. annual loss: $15K
Source: FEMA National Risk Index, county-level assessment. Individual property risk may vary.
Federal Flood Disaster History: La Salle County
La Salle County has been included in 7 federal flood-related disaster declarations.
These declarations affected communities across La Salle County, including Ottawa.
Source: OpenFEMA Disaster Declarations Summaries API. Data sourced February 2026.
NFIP Flood Insurance Claims: LaSalle County
Properties in LaSalle County have filed 679 NFIP flood insurance claims totaling $12.2M in payouts since 1978. The average claim payout is $18K.
Highest-Claim Years
2008
111 claims - $2.9M
2013
102 claims - $3.6M
1997
64 claims - $1.2M
Claims by Flood Zone
Source: OpenFEMA NFIP Claims API. Data sourced March 2026. See national claims data.
Flood Insurance Coverage: LaSalle County
Only roughly 1 in 136 households in LaSalle County carries NFIP flood insurance (0.7% of estimated households). With 77 recorded flood events and $88.0M in damage, most flood losses in this county are likely uninsured.
Penetration Rate
0.7%
roughly 1 in 136 households
Historical Claims Ratio
1 in 1
679 claims over 45+ years across 318 current policies
Avg. Claim Payout
$17,934
Per claim, county-wide since 1978
Historically, LaSalle County has averaged 2.1 claims for every active policy (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 Ottawa.
What Your Flood Zone Means in Ottawa
Ottawa 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 Ottawa are Zone AE, Zone X. FEMA's National Risk Index estimates the county's annual expected loss from inland flooding at over $33.1M.
Riverine flood risk in Ottawa 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 Ottawa address.
Repetitive Loss Properties: LaSalle County
LaSalle County has 68 properties with multiple flood insurance losses, including 12 severe repetitive loss properties. 13 properties have received FEMA mitigation funding. Severe repetitive loss is a subset of multiple loss, not a separate count. Data sourced March 2026.
Multiple Loss
68
2+ claims within 10 years
Severe Repetitive Loss
12
4+ claims or 2 exceeding value
Mitigated
13
Received FEMA mitigation
By Flood Zone
Zone data available for 64 of 68 properties.
Source: OpenFEMA NFIP Multiple Loss Properties. Data sourced March 2026.
Recorded Flood Events: La Salle County
NOAA has recorded 77 flood events in La Salle County since 1996, causing $88.0M in damage and 1 death.
Costliest Events
Events by Type
Source: NOAA Storm Events Database, 1996-2026. Data sourced March 2026.
Flood Insurance Discount: Ottawa
Ottawa 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 2
SFHA Premium Discount
40% off
CRS classes range from 1 (best) to 10 (no discount). Ottawa's Class 2 rating means NFIP policyholders in the SFHA can receive up to a 40% 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.
Ottawa, IL Flood Zone FAQ
What flood zones are in Ottawa, IL?
The most common FEMA flood zones in Ottawa 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 Ottawa?
If your Ottawa 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 Ottawa?
Enter your Ottawa 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 Ottawa offer flood insurance discounts?
Yes. Ottawa participates in FEMA's Community Rating System (CRS) with a Class 2 rating, qualifying residents in the Special Flood Hazard Area for up to a 40% discount on NFIP flood insurance premiums. Properties outside the SFHA may receive a 10% discount.
Has Ottawa experienced major flooding events?
La Salle County, where Ottawa is located, has been part of 7 federal disaster declarations for flooding, hurricanes, or severe storms. The most recent was Severe Storms, Straight-Line Winds, and Flooding in 2013. Federal disaster declarations are issued when flooding overwhelms local resources and triggers FEMA assistance programs.
How many flood insurance claims have been filed in Ottawa?
LaSalle County has recorded 679 NFIP flood insurance claims totaling $12.2M in payouts since 1978. The year with the most claims was 2008, with 111 claims and $2.9M in payouts. These figures cover all NFIP claims in the county, including Ottawa.
How many flood insurance policies are active in Ottawa?
LaSalle County currently has 318 active NFIP flood insurance policies with an average annual premium of $1,883. The most policies are in Zone AE (159 policies). These figures cover all active NFIP policies in the county.
How many Ottawa properties have flooded repeatedly?
LaSalle County has 68 properties with multiple flood losses on record, including 12 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 Ottawa 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 Ottawa?
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 Ottawa'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 Illinois Cities
Understanding Flood Zones
Look Up Any Ottawa, IL Address
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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.