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Decatur, GA Environmental Rules: Flood Zones (2026)

Significant Restrictions

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

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

Key Facts

Governing law: UDO Sec. 9.5, Floodplain Management/Flood Damage Prevention
FIS effective date: August 15, 2019
No-rise standard: 0.01 foot maximum increase in flood elevation
Floodway rule: encroachment banned except bridges, culverts, utilities
Civil penalty: up to $1,000 per day unremedied
Criminal penalty: up to $1,000 fine or 60 days jail
Administering official: UDO Administrator, Public Works Department

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 Decatur, GA.

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 Decatur, GA on the FEMA flood map

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

Summary

Any development inside a Decatur, Georgia, Area of Special Flood Hazard needs a floodplain permit before work starts, under UDO Sec. 9.5.4. The UDO Administrator reviews the site plan, elevation data and FEMA studies, and bars new construction that would raise the base flood elevation by even 0.01 foot.

No owner or developer shall perform any development activities on a site where an Area of Special Flood Hazard or Area of Future-conditions Flood Hazard is located without first meeting the requirements of this Section prior to commencing the proposed activity. ... No development shall be allowed within any Area of Special Flood Hazard or Area of Future-conditions Flood Hazard that could result in any of the following:a.Raising the base flood elevation or future-conditions flood elevation equal to or more than 0.01 foot;b.Reducing the base flood or future-conditions flood storage capacity;c.Changing the flow characteristics as to the depth and velocity of the waters of the base flood or future-conditions flood as they pass both the upstream and the downstream boundaries of the development area; ord.Creating hazardous or erosion-producing velocities, or resulting in excessive sedimentation.

View official code

Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 28).

Full Breakdown

UDO Sec. 5 applies citywide and is keyed to the Flood Insurance Study dated August 15, 2019, plus the corresponding DeKalb County FIS for annexed land, both adopted by reference in Sec. D. Before any development activity on a site with an Area of Special Flood Hazard or Area of Future-Conditions Flood Hazard, Sec. A requires an application to the UDO Administrator including a floodplain management/flood damage prevention plan with site elevations, building corner spot elevations, drainage plans, and base and future-conditions flood elevations certified by a licensed engineer or surveyor.

Sec. 01 foot or more, reduce flood storage capacity, or change flow depth and velocity at the site's upstream or downstream boundaries, and any allowed encroachment must compensate for lost storage on the same property. Sec. E prohibits fill, new construction or substantial improvements within the regulatory floodway outright, with a narrow exception for bridges, culverts, roadways and utilities backed by an engineer's hydraulic analysis showing no increase in flood elevations. Variances go to the Zoning Board of Appeals under Sec. 7 and cannot be granted within a designated floodway if they would raise flood levels.

Violations & Fines

The UDO Administrator can issue a stop-work order, withhold a certificate of occupancy, or suspend, revoke or modify the development permit until remedial measures are taken. Continued noncompliance draws civil penalties up to $1,000.00 per day, and intentional and flagrant violations can bring a criminal citation to municipal court with a fine up to $1,000.00 or up to 60 days imprisonment under UDO Sec. 9.5.8.

Frequently Asked Questions

Do I need a permit to build in a Decatur, GA flood zone?

Yes. UDO Sec. 9.5.4.A.1 bars any development activity on a site within an Area of Special Flood Hazard or Area of Future-Conditions Flood Hazard until the owner meets the section's requirements and obtains a permit from the UDO Administrator, who reviews the site plan against the 2019 Flood Insurance Study before work begins.

Can a project raise the flood level for neighbors in Decatur?

No. Sec. 9.5.5.C.1 blocks any development in a Special Flood Hazard or Future-Conditions Flood Hazard Area that would raise the base or future-conditions flood elevation by 0.01 foot or more, reduce flood storage capacity, or change flow depth and velocity at the site's upstream and downstream boundaries.

Are floodway encroachments ever allowed in Decatur?

Rarely. Sec. 9.5.5.E.2 prohibits fill, new construction and substantial improvements in the regulatory floodway, with a narrow exception in Sec. 9.5.5.E.3 for bridges, culverts, roadways and utilities that an engineer certifies will not raise the base flood elevation, floodway elevation or floodway width.

Sources & Official References

[1]Decatur, GA Code of Ordinances (Municode)

Other rules in Decatur

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