Flood Zones: Evanston vs Oak Park
How do flood zones rules compare between Evanston, IL and Oak Park, IL?
Evanston and Oak Park have similar restriction levels.
Evanston, IL
Cook County
Evanston participates in the National Flood Insurance Program and regulates construction in FEMA-designated Special Flood Hazard Areas. New construction and substantial improvements in flood zones must elevate the lowest floor at least one foot above base flood elevation. Evanston's flood damage prevention ordinance exceeds minimum NFIP standards.
View full Evanston rules →Oak Park, IL
Cook County
Oak Park has FEMA-designated flood zones primarily along the Des Plaines River corridor and areas affected by the combined sewer system. Properties in Special Flood Hazard Areas (SFHAs) must comply with floodplain development regulations including elevation requirements, flood insurance mandates, and construction restrictions. The village participates in the National Flood Insurance Program (NFIP).
View full Oak Park rules →Key Facts Comparison
| Fact | Evanston | Oak Park |
|---|---|---|
| Freeboard Requirement | 1 foot above BFE | - |
| CRS Participant | Yes — insurance discounts possible | - |
| Substantial Improvement | 50% of market value threshold | 50% of market value triggers compliance |
| Elevation Certificate | Required before occupancy | - |
| Community Dev | (847) 448-4311 | - |
| NFIP Participant | - | Yes |
| Primary Flood Risk | - | Des Plaines River & combined sewers |
| Elevation Required | - | At or above BFE in SFHAs |
| CRS Participation | - | May reduce insurance premiums |
Highlighted rows indicate differences between cities.
Evanston FAQ
How high must new construction be above the flood level in Evanston?
The lowest floor, including basement, must be at least one foot above the base flood elevation. This freeboard requirement exceeds the minimum NFIP standard and provides additional flood protection.
Does Evanston participate in the CRS program?
Yes. Evanston participates in the Community Rating System, which can provide flood insurance premium discounts to residents in SFHAs based on the city's floodplain management practices.
Can I renovate a building in a flood zone in Evanston?
Yes, but if the improvements equal or exceed 50% of the structure's market value, the entire structure must be brought into compliance with flood zone requirements, including elevation above BFE.
Oak Park FAQ
Is my Oak Park property in a flood zone?
Check FEMA's Flood Insurance Rate Maps (FIRMs) at msc.fema.gov or contact the village's engineering department. Properties near the Des Plaines River corridor are most likely to be in designated flood zones.
Do I need flood insurance in Oak Park?
If your property is in a Special Flood Hazard Area and you have a federally backed mortgage, flood insurance is required. Even properties outside SFHAs can flood, so insurance is recommended for all Oak Park homeowners.
Can I finish my basement if I am in a flood zone?
Basements in SFHAs face strict regulations. Substantial improvements (costing 50% or more of the structure's value) must comply with floodplain development standards. Contact the village's Building Division before starting work.
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