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DeKalb County, GA Environmental Rules: Flood Zones (2026)

Some Restrictions

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

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

Key Facts

Permit required: before construction in flood hazard area
Administering office: planning and sustainability director
Scope: unincorporated DeKalb County only
Penalty: Section 1-10 fine, daily violation

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 DeKalb County, 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 DeKalb County, GA on the FEMA flood map

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

Summary

Unincorporated DeKalb County requires a development permit before any construction begins in a mapped special flood hazard area, per County Code Section 14-420.

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

A development permit shall be obtained before any construction of other development begins within any area of special flood hazard established in section 14-412. Application for a development permit shall be made on forms promulgated by the director and may include, but not be limited to, floodplain management/flood damage prevention plan; plans in duplicate drawn to scale showing the nature, location, dimensions, and elevation of the area in question; existing or proposed structures, fill, storage of materials drainage facilities; and location of the foregoing. Specifically, all of the following information is required before the director will consider the application for a development permit:

Source: Dekalb County Municipal CodeView official code

Full Breakdown

Before any construction or development begins within a mapped area of special flood hazard in unincorporated DeKalb County, an applicant must file a development permit application with the planning and sustainability director. The application must include a certified site plan with spot elevations, proposed floodway boundaries, and base flood elevation data. Cities carved out of DeKalb, Dunwoody, Brookhaven, Tucker, Stonecrest, Decatur, Chamblee, Doraville, Clarkston, Avondale Estates, Lithonia, Pine Lake and Stone Mountain, administer their own floodplain rules, not this county code.

Violations & Fines

Building without a permit can trigger a stop-work order, denial of a certificate of occupancy, permit revocation, and a Section 1-10 fine, with each day of violation a separate offense.

Frequently Asked Questions

Does DeKalb County's floodplain permit apply inside Decatur or Dunwoody?

No: those cities incorporated out of unincorporated DeKalb and enforce their own flood ordinances, not County Code Section 14-420.

What must I submit with a flood zone development permit application?

A certified site plan showing elevations, floodway boundaries, and base flood elevation data, reviewed by the county's floodplain coordinator before construction starts.

Sources & Official References

[1]DeKalb County Code of Ordinances § 14-420

Other rules in DeKalb County

Parking Rules: Street Parking LimitsSome Restrictions Stormwater ManagementSome Restrictions Erosion ControlSignificant Restrictions Flood Elevation RequirementsSome Restrictions Noise Ordinances: Decibel LimitsSome Restrictions Noise Ordinances: Barking DogsSome Restrictions Noise Ordinances: Aircraft NoiseLight Restrictions Parking Rules: Preferential Parking DistrictsSome Restrictions Parking Rules: Commercial & Oversized VehiclesSignificant Restrictions

All DeKalb County rules

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