Floodplain Information

Every property is at risk of flooding. Insurance agents, lenders, builders and other professionals use regulatory maps to determine the likelihood of a flood occurring on your property. This page provides links that help you see the maps they use, find out about flood insurance and learn about updates to the maps.

The Georgia Department of Natural Resources (GA DNR) and Federal Emergency Management Agency (FEMA), in conjunction with the City, have updated the FEMA maps. Copies of the new maps and flood insurance information can be found in the links below.

In accordance with the City’s National Pollutant Discharge Elimination System (NPDES), Municipal Separate Storm System (MS4) and the Permit with Georgia Department of Natural Resources Environmental Protection Division, the City is required to regulate development in expanded Special Flood Hazard Areas and Future Floodplains. The expanded Special Flood Hazard Areas are based on drainage basins of 100-640 acres at current land use conditions. The Future Floodplains are estimated flood elevations considering land use fully built out per the comprehensive plan. Regulations for development can be found in The Unified Development Code Article III Section 3.4. City floodplain maps can be accessed through the link below.


If you have questions for the City, please contact Jill Bazinet at jbazinet@alpharetta.ga.us or 678-297-6200.