Coastal Georgia Aquifer Pumping Drops Under State Caps
Conservation measures in coastal Georgia successfully reduced groundwater reliance over the last three decades.
Updated on Oct. 27, 2026 in Environmental
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Coastal Georgia has successfully reduced groundwater consumption in the Floridan aquifer through long-standing pumping restrictions. Data presented at the Biennial Okefenokee Science Symposium confirms significant drops in usage for Chatham and Glynn counties over the last three decades.
Why it matters
Managing aquifer withdrawal is essential for preventing saltwater intrusion into freshwater supplies in coastal regions. These conservation efforts reflect the effectiveness of regulatory limits established in 2006 to protect the long-term viability of the state's groundwater resources.
Coastal groundwater withdrawals have dropped significantly, with Chatham County use falling to 43.2 Mgal/d from 85.5 Mgal/d in 1990. Glynn County saw a similar trend, dropping to 39.8 Mgal/d from 71.9 Mgal/d over the same thirty-year period.
The players
Greg Cherry
A researcher with the U.S. Geological Survey who studies regional groundwater flow systems and aquifer management.
Georgia Environmental Protection Division
The state agency responsible for implementing environmental regulations and managing water resources.
U.S. Geological Survey
The federal scientific agency that monitors and assesses groundwater systems through site-specific and regional studies.
The details
The Floridan aquifer is a vast underground reservoir of porous limestone that stores freshwater for much of Georgia. To prevent the migration of saline water from the coast, the Georgia Environmental Protection Division mandates that pumping rates within the designated "red zone"—which includes Chatham and southern Effingham counties—cannot exceed 2004 levels. Conservation programs and shifting regional water management practices have enabled these utilities and industries to rely on lower volumes of extracted groundwater.
Timeline
1990: Groundwater use measurements began for comparison in Chatham and Glynn counties.
2004: Baseline year established for capping aquifer pumping rates.
2006: Georgia EPD implemented red zone pumping restrictions.
2020: Most recent groundwater use assessment completed for coastal counties.
The Tech Race
This progress tracks the efficacy of the Georgia Environmental Protection Division's 2006 red zone pumping restrictions. By measuring usage against these established caps, researchers are determining the long-term viability of coastal aquifer management strategies.
Coastal residents and regional industries remain subject to strict groundwater pumping caps to maintain water security. These conservation measures ensure that local aquifers do not become contaminated by saltwater infiltration, preserving water quality for long-term use.
The takeaway
The sustained reduction in groundwater usage demonstrates that regulatory caps successfully mitigate risks to coastal aquifers. Readers should watch for future U.S. Geological Survey updates regarding the saltwater plume near Brunswick to confirm if usage levels remain sufficient to halt migration.
Further reading
For more on how the region manages its natural resources, explore the Environmental section.
More information
Review the full findings on the Brunswick-Glynn County groundwater monitoring project page.
Source note: This article includes information reported by USGS.
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