St. Johns River Water Management District St. Johns River Water Management District St. Johns River Water Management District St. Johns River Water Management District St. Johns River Water Management District St. Johns River Water Management District
St. Johns River Water Management District -

Water bodies, watersheds and storm water
Pegasus Spring main view

Pegasus Spring main view

Pegasus Spring vent

Pegasus Spring vent

Pegasus Spring boil in run

Pegasus Spring boil in run

Pegasus Spring

Seminole County


Pegasus Spring is a third-magnitude spring. The spring head is a small pool with the vent discharging at an angle. The vent opening is approximately 1 to 2 feet wide, discharging about 2 feet below the water’s surface. A sand boil is also present approximately 200 feet down the spring run. Semitropical forests surround the spring, with Starbuck Spring less than 0.1 mile toward the northwest. Ginger Ale Springs and Palm Springs are located 0.3 and 0.4 mile, respectively, toward the south-southwest from Pegasus Spring.


Discharge from Pegasus Spring, measured in 2005 by the St. Johns River Water Management District, was 2.8 cubic feet per second.

Water quality

Pegasus Spring was sampled by the district in 2005. The water quality data for selected variables are shown in the table below. Water temperature and pH were also measured in 2004.

Summary statistics of water quality and discharge
at Pegasus Spring

Pegasus Spring Value Period
Discharge, cfs 2.80 2005
Alkalinity, total, mg/L as CaCO3 108.0 2005
Calcium, total, mg/L as Ca 41.7 2005
Chloride, total, mg/L as Cl 19.8 2005
Dissolved Oxygen 0.71 2004
Magnesium, total, mg/L as Mg 10.5 2005
Nitrate + nitrite, total, mg/L as N 0.54 2005
Orthophosphate, total, mg/L as P 0.16 2005
pH, field 7.21 2004−2005
Phosphorus, total, mg/L as P 0.22 2005
Potassium, total, mg/L as K 1.8 2005
Sodium, total, mg/L as Na 11.6 2005
Specific conductance, field, µmhos/cm at 25°C 370 2005
Specific conductance, lab, µmhos/cm at 25°C 361 2005
Sulfate, total, mg/L as SO4 43.5 2005
Total dissolved solids, mg/L 210 2005
Water temperature, °C 23.6 2004−2005
Units: µmhos/cm = micromhos per centimeter
         mg/L = milligrams per liter
         cfs = cubic feet per second

Age of discharge water

The age of water discharging from Pegasus Spring was determined by measuring the concentration of tritium, delta carbon-13, and carbon-14 in the spring discharge, which was measured in March 2005. Pegasus Spring had a tritium concentration of 1.09 tritium units, which suggests that the water is less than 52 years old. Pegasus Spring had a delta carbon-13 value of −11.86 parts per thousand and a carbon-14 concentration of 53% modern carbon, which results from the reaction of rainfall with calcite, dolomite, and sediment organic matter. The adjusted carbon-14 age of Pegasus Spring is recent.


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St. Johns River Water Management District
4049 Reid Street, Palatka, FL 32177
(800) 725-5922