Environmental Rules in Marietta, GA (2026)
4 verified environmental rules for Marietta, Georgia, sourced directly from the municipal code and official government pages.
Verified from official government sources
Stormwater Management
New development adding 5,000 square feet of impervious surface, or disturbing an acre or more, must meet Marietta's post-development stormwater standards under City Code § 7-8-14-030. Projects must detain the one-year, 24-hour storm, hold 25-year peak discharge to pre-development rates, and avoid worsening flooding in the 100-year, 24-hour storm.
Marietta Post-Development Stormwater Standards
Some RestrictionsMarietta Code of Ordinances § 7-8-14-030(D)(1), (E)-(G)
1.New development that creates or adds 5,000 square feet or greater of new impervious surface area or that involves land-disturbing activity of one acre of land or greater; ... E.Stream Channel Protection. Stream channel protection shall be provided by using all of the following three approaches:1.Twenty-four-hour extended detention storage of the one-year, 24-hour return frequency storm event;...
Erosion Control
Marietta's Soil Erosion, Sedimentation and Pollution Control Ordinance, City Code Article 7-8-12, requires a public works department permit before land-disturbing activity and mandates best management practices from the state manual on every covered site. A 25-foot vegetated buffer protects state waters, and violators face stop-work orders plus civil penalties of up to $2,500.00 per day.
Marietta Erosion and Sediment Control Rules
Some RestrictionsMarietta Code of Ordinances § 7-8-12-040(B)(1), (C)(15); § 7-8-12-070(D)
1.Best management practices as set forth in Sections 7-8-12-040 B. and C. shall be required for all land-disturbing activities. ... 15.Except as provided in paragraphs 16. and 17. of this subsection, there is established a 25-foot buffer along the banks of all state waters, as measured horizontally from the point where vegetation has been wrested by normal stream flow or wave action ... D.Monet...
Flood Zones
Marietta requires a land development permit before any activity begins in a mapped area of special flood hazard or future-conditions flood hazard under City Code § 7-8-10-030(A). Section 7-8-10-040(E) bars new fill, construction or substantial improvements inside the regulatory floodway, with narrow exceptions for bridges, culverts, roadways and utilities that pass a no-rise engineering analysis.
Marietta Floodplain Development Permit Rules
Significant RestrictionsMarietta Code of Ordinances §§ 7-8-10-030(A), 7-8-10-040(E)(1)
A.Permit Application Requirements. No owner or developer shall perform any land 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 article prior to commencing the proposed activity. ... 1.Encroachments are prohibited, including earthen fill, new construction, substantial impro...
Flood Elevation Requirements
Marietta's floodplain ordinance, City Code Article 7-8-10, requires new construction and substantial improvements in the future-conditions floodplain to elevate the lowest floor at least three feet above base flood elevation or one foot above the future-conditions flood elevation, whichever is higher. The public works director administers the article.
Marietta Base Flood Elevation Requirements
Some RestrictionsMarietta Code of Ordinances §§ 7-8-10-020, 7-8-10-050(B)(1)(a)
"Base flood elevation" means the highest water surface elevation anticipated at any given location during the base flood. ... a.New Construction. New construction of principal residential structures shall not be allowed within the limits of the future-conditions floodplain unless all requirements of Subsections 7-8-10-040 C., D. and E. have been met. If all of the requirements of Subsections 7-...
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