Environmental Rules in Gwinnett County, GA (2026)
4 rules for unincorporated Gwinnett County, Georgia.
Verified from official government sources
Stormwater Management
New development in unincorporated Gwinnett must retain the first inch of rainfall on-site and treat runoff from 85% of a typical year's storms, cutting post-development pollutant loads by 80% under UDO Chapter 800.
Gwinnett County Stormwater Runoff Standards
Some RestrictionsGwinnett County UDO §§ 800-10.2, 800-10.3
800-10.2 Runoff reduction practices shall be sized and designed to retain the first 1-inch of rainfall on the site to the maximum extent practicable. Runoff reduction practices are stormwater best management practices, BMP's, used to disconnect impervious and disturbed pervious surfaces from the stormwater drainage system to reduce the post-construction stormwater runoff rates, volumes, and pol...
Erosion Control
In unincorporated Gwinnett County, land-disturbing construction requires a land disturbance permit and Best Management Practices; disturbed soil must be stabilized with temporary cover within 14 days of inactivity and permanent vegetation within 30 days.
Gwinnett County Erosion and Sediment Control Rules
Some RestrictionsGwinnett County UDO § 400-30.3.G
Temporary vegetation or mulching shall be employed to protect exposed critical areas during development. The disturbed area shall be stabilized with temporary vegetation or mulch if land-disturbing activity temporarily ceases for more than 14 calendar days.
Flood Zones
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.
Gwinnett County Floodplain Development Permit
Significant RestrictionsGwinnett County UDO §§ 700-10.2, 700-10.7
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 aff...
Flood Elevation Requirements
Substantially improved residential structures in Gwinnett's flood hazard areas must set the lowest floor at least three feet above the 100-year base flood elevation, or one foot above the future-conditions flood elevation, whichever is higher.
Gwinnett County Flood Elevation Freeboard Rule
Some RestrictionsGwinnett County UDO § 700-40.2(A)(2)
Substantial improvements. For substantial improvements to all or part of an existing principal residential buildings, the requirements of Sections 700-20.1 through 700-20.3 and Sections 700-30.1 et seq., shall apply and the elevation of the lowest floor, including basement and access to the building, shall be elevated at least three feet above the level of the highest base flood elevation (100-...
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