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Gwinnett County, 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 Gwinnett 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 floodplain clearing/grading
Coverage: Areas of Special Flood Hazard
Scope: unincorporated Gwinnett only
Administrator: Dept. of Planning & Development
Chapter: 700, effective 9-26-2023

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 Gwinnett 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 Gwinnett County, GA on the FEMA flood map

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

Summary

In unincorporated Gwinnett County, any clearing, grading, or development activity within, adjacent to, or affecting a mapped flood hazard area requires a development permit under UDO Chapter 700 before work begins.

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

700-10.2 Requirements. The requirements of Chapter 700 shall be applicable to all Areas of Special Flood Hazard within the jurisdiction of Gwinnett County. ... 700-10.7 Establishment of Development Permit. A development permit shall be required in conformance with the provisions of this UDO prior to the commencement of any clearing, grading, or development activities adjacent to, within, or affecting a future conditions floodplain.

Source: FEMA Flood Map Service CenterView 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 9).

Full Breakdown

Chapter 700 of the Gwinnett UDO governs all Areas of Special Flood Hazard within county jurisdiction. Before any clearing, grading, or development activity that affects a future-conditions floodplain begins, the property owner must obtain a development permit meeting Chapter 700's requirements, which are treated as minimum standards and construed in the county's favor. The Department of Planning and Development administers permit review, verifies flood-safe siting, and records the elevation of new or substantially improved structures relative to the base flood elevation.

Violations & Fines

Developing, filling, or building in a flood hazard area without an approved Chapter 700 permit is a UDO violation; the Department can withhold certificates of occupancy and require corrective work, with enforcement under UDO Chapter 120.

Frequently Asked Questions

Do I need a permit to build in a Gwinnett County flood zone?

Yes. Any clearing, grading, or development activity within, adjacent to, or affecting an Area of Special Flood Hazard in unincorporated Gwinnett requires a development permit under UDO Chapter 700 before work starts.

Does this floodplain rule apply inside Gwinnett's cities?

No. Chapter 700 covers unincorporated Gwinnett County only; Lawrenceville, Duluth, Snellville, and the county's other 13 cities each administer their own floodplain ordinance.

Sources & Official References

[1]Gwinnett County UDO §§ 700-10.2, 700-10.7 (Municode)

Other rules in Gwinnett County

Noise Ordinances: Quiet HoursSome Restrictions Noise Ordinances: Construction HoursSome Restrictions Erosion ControlSome Restrictions Flood Elevation RequirementsSome Restrictions Stormwater ManagementSome Restrictions Noise Ordinances: Leaf Blower RulesSome Restrictions Noise Ordinances: Amplified Music & Outdoor SoundSome Restrictions Parking Rules: Abandoned VehiclesSignificant Restrictions Parking Rules: EV ChargingSome Restrictions

All Gwinnett County rules

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