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Rock Island County, IL Environmental Rules: Flood Zones (2026)

Some Restrictions

Compiled from the official code textEditor Martyn O'NeillLast verified September 2026

FEMA flood zone rules in Rock Island County, IL, also called floodplain regulations or special flood hazard area (SFHA) rules, determine flood insurance requirements and elevation standards for new construction.

Key Facts

Governing sections: §§ 154.610-154.621
Permit required: Before any floodplain development
Enforcing office: County Dept. of Zoning & Building Safety
Flood data source: FEMA FIS dated April 5, 2010
Freeboard standard: Base flood elevation plus 2 feet
Base fine range: $50 to $500 per offense
Variance authority: County Zoning Board of Appeals

FEMA Flood Zone Lookup

FEMA assigns every parcel in the U.S. a flood-hazard designation on its Flood Insurance Rate Maps (FIRMs). Zones starting with A or V are high-risk Special Flood Hazard Areas where federally backed mortgages require NFIP flood insurance. Zone X indicates moderate-to-minimal risk, where insurance is optional but often recommended. Your specific zone determines insurance cost, build elevation, and permit requirements in Rock Island County, IL.

Zone	What it means	NFIP required?
A	High-risk flood area; 1% annual chance flood, no detailed analysis.	Yes
AE	High-risk; same as A but with established Base Flood Elevations.	Yes
AH	High-risk shallow flooding (1-3 ft), usually ponding.	Yes
AO	High-risk shallow flooding (1-3 ft) with sheet flow on sloping terrain.	Yes
V	High-risk coastal zone subject to wave action (no BFE).	Yes
VE	High-risk coastal zone with wave action and established BFEs.	Yes
X (shaded)	Moderate risk; between the 1% and 0.2% annual chance flood.	Recommended
X	Minimal risk; outside the 0.2% annual chance floodplain.	No

Look up Rock Island County, IL on the FEMA flood map

FEMA maps update periodically; verify zone before buying flood insurance or building.

Summary

In unincorporated Rock Island County, no one may start development in a mapped floodplain without a permit from the Zoning and Building Safety Director. Floodways along the Rock River, Mississippi River, and nine named creeks are drawn from FEMA's April 5, 2010 flood insurance study, and new buildings must clear the base flood elevation plus two feet of freeboard.

These county ordinances apply to unincorporated areas of Rock Island County. Incorporated cities within the county may have their own rules that take precedence over county-level regulations.

(A) No person, firm, corporation, or governmental body not exempted by law shall commence any development in the floodplain without first obtaining a development permit from the Director of the County Department of Zoning and Building Safety. (B) The Director of the County Department of Zoning and Building Safety shall not issue a development permit if the proposed development does not meet the requirements of this subchapter.

View official code

Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: 2025 S-1: Supplement contains: Local legislation current through Ord. 2024-12-A, passed 12-17-2024; and State legislation current through 2024 Illinois Legislative Service, Pamphlet #6).

Full Breakdown

621 governs construction, filling, and grading in the county's special flood hazard areas outside incorporated municipalities. 614 requires a development permit before any demolition, construction, filling, or manufactured-home placement in the floodplain, and the Director of the County Department of Zoning and Building Safety must compare the site's elevation to the base flood elevation before signing off. The permit application must include scaled site drawings, existing and proposed grade elevations, building locations and dimensions, the lowest-floor elevation for any proposed structure, and a licensed engineer's or contractor's cost estimate.

Base flood elevations come from the countywide Flood Insurance Study prepared by FEMA and dated April 5, 2010, covering the Rock River, North Channel Rock River, Coal Creek, Eckhart Creek, Kyte Creek, Mississippi River, Mill Creek, Shaffer Creek, and Sylvan Slough, among others. Flood Protection Elevation is defined as the base flood elevation plus two feet of freeboard, and a non-conversion agreement must be recorded before occupancy for any enclosure below an elevated building or detached structure over 70 square feet. 620, but the board cannot grant one inside a designated floodway and must find the relief is the minimum necessary and creates no added public expense for flood rescue, policing, or repairs.

Violations & Fines

General violations of Chapter 154 carry a fine of $25 to $200 per offense under § 154.999(A), with jail up to 30 days for nonpayment and each day counted separately. Floodplain-specific violations under §§ 154.610-154.621 escalate to $50-$500 per offense once the Zoning and Building Safety Department gives ten days' written notice and the owner fails to correct the problem; each week of continued violation is a separate offense, a notice of violation is recorded against the property's title, and the county can seek a Circuit Court injunction or warn the owner that flood insurance coverage may be suspended.

Frequently Asked Questions

Do I need a permit to build in a floodplain in unincorporated Rock Island County?

Yes. Section 154.614 bars any person, firm, or governmental body from starting development, including filling, grading, or placing a manufactured home, in a mapped floodplain without a development permit from the Director of the County Department of Zoning and Building Safety.

How high above the flood level must a new building sit?

The code sets the Flood Protection Elevation at the base flood elevation plus two feet of freeboard. The Director maintains records of each building's as-built lowest-floor elevation, elevation certificate, or floodproofing certificate to confirm compliance under § 154.616.

What if I build in the floodplain without a permit?

The county issues a written notice and gives ten days to fix it. If nothing changes, § 154.999(B) sets fines of $50 to $500 per offense, treats every week of continued violation separately, and can trigger a Circuit Court injunction or recorded title notice.

Can I get a variance from the floodplain building standards?

Only from the County Zoning Board of Appeals under § 154.620, and only if the project cannot go elsewhere, the hardship is exceptional, the relief requested is minimal, and it will not add public expense for flood rescue or repairs. No variance is available inside a designated floodway.

Sources & Official References

[1]Rock Island County Code of Ordinances § 154.610-154.621

Other rules in Rock Island County

Parking Rules: Street Parking LimitsSome Restrictions Fence Regulations: Height LimitsSome Restrictions Erosion ControlSome Restrictions Flood Elevation RequirementsSome Restrictions Stormwater ManagementSome Restrictions Boat Dock PermitsSome Restrictions Noise Ordinances: Decibel LimitsSome Restrictions Parking Rules: Abandoned VehiclesSome Restrictions Fence Regulations: Material RestrictionsSignificant Restrictions Fire Regulations: Propane StorageSome Restrictions

All Rock Island County rules

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