Illinois has about ~52,000 active NFIP flood insurance policies, with an average annual premium of $640/yr under FEMA's Risk Rating 2.0 methodology. The biggest flood risk areas in the state are Chicago metro (Des Plaines River, North Branch), Illinois River valley, Mississippi River border, Kankakee River. Private flood market availability: Moderate.
NFIP Policies in Force
~52,000
Estimate, federal flood program
Avg NFIP Premium
$640/yr
Risk Rating 2.0 average
Private Flood Market
Moderate
Carrier availability for higher limits
| Topic | Detail | Notes |
|---|---|---|
| Top risk areas | Chicago metro (Des Plaines River, North Branch), Illinois River valley, Mississippi River border, Kankakee River | Mandatory purchase in SFHA + federal mortgage |
| Recent major flood | 2023 Chicago-area flooding (July 2023); Illinois River flooding (spring 2019) | Drives claim data and premium revisions |
| Average NFIP premium | $640/yr | Risk Rating 2.0 phased increases (18%/yr cap) |
| CBRS coastal restrictions | No major CBRS zones | Mostly inland flood exposure |
NFIP statistics from FEMA's national insurance data; premium averages reflect Risk Rating 2.0 phase-in. Private flood market sized from state department of insurance filings. Always verify your specific property's flood zone at floodsmart.gov.
Illinois faces two distinct flood risk environments: the Chicago metropolitan area's urban flash flood problem, driven by aging combined sewer systems, large impervious surfaces, and the periodic overloading of the Des Plaines River, the North Branch of the Chicago River, and the Metropolitan Water Reclamation District's Tunnel and Reservoir Plan (TARP) system; and the riverine flooding of the Illinois River and its tributaries across the central part of the state, plus significant Mississippi River floodplain exposure along the western border. The July 2023 Chicago flooding event caused record rainfall in some suburban Cook and DuPage county areas, flooding thousands of homes and demonstrating that even properties with flood insurance protection through NFIP faced significant uncovered losses from sewer backup and sump pump overflow.
Illinois has approximately 52,000 NFIP policies, with concentration in Cook, Kane, DuPage, Will, and the Illinois River valley counties. Risk Rating 2.0 produced mixed results — some suburban Chicago properties with high replacement values saw increases, while riverine properties with lower values in central Illinois saw modest changes. The statewide average of approximately $640 per year reflects the inland, lower-surge character of Illinois flooding. Private flood insurance is moderately available in the Chicago metro. A critical distinction in Illinois: NFIP flood insurance does NOT cover sewer backup or sump pump overflow unless caused by an external flood — a separate sewer backup endorsement through homeowners insurance is critical for the typical Chicago-area flood scenario.
Homeowners and renters policies categorically exclude flood damage. You must purchase a separate flood policy through the National Flood Insurance Program (NFIP) or a private flood insurer. Note: there's a standard 30-day waiting period from purchase to coverage, so don't wait until a storm is forecast.
NFIP residential policies cap building coverage at $250,000 and contents at $100,000. Homes worth more than these limits should consider 'excess flood' coverage through a private insurer or a fully-private flood policy with higher limits.
Major flood event affecting Illinois: 2023 Chicago-area flooding (July 2023); Illinois River flooding (spring 2019). Repeated severe events tend to push up local NFIP premiums and shift more properties into mandatory-purchase Special Flood Hazard Areas.
💡 Illinois Pro Tip
Flood insurance is required for federally backed mortgage holders in Illinois SFHAs — primarily along the Illinois, Kankakee, Des Plaines, Fox, Rock, and Mississippi rivers, and in mapped urban floodplain areas in the Chicago metro. Many suburban Chicago homeowners in Cook, DuPage, Will, and Lake counties are in or near mapped flood zones due to the region's flat topography and drainage challenges. Outside mandatory zones, the Chicago area's documented history of urban flooding makes voluntary flood coverage — combined with sewer backup endorsements on homeowners policies — a prudent investment.
Illinois's average NFIP premium is approximately $640 per year. Chicago suburban properties in active flood zones along the Des Plaines or Fox rivers typically pay $700–$1,600. Illinois River valley properties in Peoria, Ottawa, or Havana areas generally pay $600–$1,200. Lower-risk Zone X properties can access Preferred Risk Policies for $350–$550. Private flood insurance is available in the Chicago metro and can be competitive for well-constructed homes with documentation of mitigation measures.
NFIP flood insurance in Illinois covers riverine flooding from the Illinois, Des Plaines, Kankakee, Mississippi, and other rivers overflowing their banks, surface water flooding from intense rainfall exceeding drainage capacity, overland sheet flow in urban areas, and mudflow caused by flooding. A critical caveat for Chicago-area residents: NFIP does NOT cover water damage from sewer backup, sump pump overflow, or drain backup — even if those events are triggered by an external storm or flood. Illinois homeowners in urban areas should maintain separate sewer backup coverage through their homeowners policy in addition to any flood coverage.
Data sourced from FEMA NFIP statistics and state Department of Insurance filings for Illinois, April 2026.
Michael Torres
Editorial Lead, Catastrophe & Commercial Property
This article was researched and written by the Cover Forge USA editorial team against federal sources (NAIC, CMS, FEMA, DOL, SSA, state DOIs) and standard policy forms. Bylines organize content by topic — they do not assert individual licensure. See our editorial-policy for details.
Reviewed April 2026
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