By Robert L. Knight, Florida Springs Institute
Florida’s “Springs Heartland” covers an estimated 5,664 square miles of the Suwannee River basin. Plentiful rain falling on porous karst geology collects and feeds groundwater to more than 300 artesian springs. These springs feed life-nourishing groundwater to the Suwannee River – immortalized in song and legend.
And yet, the Suwannee River is now listed as one of the 10 most endangered rivers in the United States. How did we allow this tragedy?
At the beginning of the last century, the Springs Heartland boasted the highest regional spring flow in Florida (and the U.S.), with an estimated predevelopment average discharge of 4.75 billion gallons per day (BGD).
That historic flow accounted for half of all artesian spring flows in Florida – the “Land of a Thousand Springs.” But, within a 70-year period of increasing groundwater extractions through wells, the combined flows of all of Florida’s 1,000-plus springs had dropped by one third. Surprisingly, in the Suwannee Heartland, which has the second-lowest groundwater extraction rate, average spring flows had declined by 2.3 BGD.
Why did the region with the second-lowest population and number of wells have the lion’s share of the springs flow depletion? The answer is as clear as a healthy spring: All Florida’s springs share a common groundwater source – the Floridan Aquifer.
You can think of the interconnected aquifer as a giant Slurpee cup. Put in a few straws and everyone is happy. Put in 20,000 of the largest wells (straws) and liquid levels fall, even with “free refills” (rain). Add another 950,000 smaller groundwater extraction wells, and you have the currently depleted Floridan Aquifer.
The result is more than 1,000 formerly pristine springs without healthy flows.
The fundamental principle is that water is conserved. Rainwater that recharges the Floridan Aquifer is equal to the sum of groundwater losses from the aquifer through spring flows, water storage and extractions through wells.
The Springs Heartland provides the greatest volume of recharge to the Floridan Aquifer (more than two times as much as any other groundwater basin), but groundwater extractions from the two more intensively developed regions (in the St. Johns and Southwest Florida water management districts) pump the lion’s share of North Florida’s groundwater.
Just like a Slurpee cup with multiple straws, whoever sucks the hardest gets the most.
A 2025 review of water management district (WMD) water use permits found the following:
- St. Johns River WMD currently has about 2,109 permits for 9,171 large wells, authorizing up to 1.31 BGD of groundwater withdrawals from the Floridan Aquifer.
- The Southwest Florida WMD currently has 1,279 permits for a total of 4,298 wells, authorized to pump 0.98 BGD.
- Suwannee River WMD currently has 1,205 large groundwater use permits, authorizing pumping up to 0.52 BGD from 4,550 wells.
- The Northwest Florida WMD has 413 large groundwater withdrawal permits, including 2,256 wells, and a groundwater allocation of 0.32 BGD.
These four WMDs have 20,275 large wells permitted to pump up to 3.13 BGD. This number does not include the pumping from hundreds of thousands of private self-supply and landscape irrigation wells in these four WMDs.
Floridan Aquifer levels and resulting spring flows are highly influenced by groundwater withdrawals throughout the aquifer. Groundwater recharged in one water management district can move to another water management area in response to pumping.
The first conclusion is that all groundwater users pumping from the Floridan Aquifer are in part responsible for declining flows at the many hundreds of artesian springs in Florida.
The second conclusion is that some groundwater users are more responsible than others.
Florida’s laws mandate protection of minimum aquifer levels and spring flows that do not result in significant harm to aquatic and human use values. Florida’s WMDs are not managing our groundwater resources in compliance with state law.
Current spring flow reductions are greater than one third of historic levels. A safe flow reduction that protects springs ecology is 10%.
While enacting required minimum flows for the largest springs, Florida’s WMDs are over allocating a limited resource. They ignore measured spring flow reductions and rely on incorrect groundwater flow models that underestimate human groundwater withdrawal impacts.
The winners in this charade are the for-profit permit holders who multiply the inherent value of free water into private corporate profits.
The losers are the public who see the degradation of springs and other surface waters held by the state of Florida in public trust.
Robert L. Knight, Ph.D., is president of the Howard T. Odum Florida Springs Institute in High Springs. Banner photo: Tubers at Ginnie Springs in north Florida (iStock image).
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