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
Sun Eden Spring main view

Sun Eden Spring main view
photo by T. Roberts, FGS

Sun Eden Spring

Lake County


Sun Eden Spring is a low fourth-magnitude spring that is composed of several sand boils in an oval-shaped pool, about 75 feet long, 65 feet wide and up to 3 feet deep. The pool has a sand bottom with algae and organic matter, with aquatic vegetation and algae present on the surface of the pool. The spring run flows 400 feet toward the west, through a culvert under the street, then flows north 0.3 mile in a man-made channel to Lake Harris. The spring is surrounded by a private residential area.

Sun Eden Spring run

Sun Eden Spring run


Discharge at Sun Eden Spring was measured by the U.S. Geological Survey (USGS) in 1997 and by St. Johns River Water Management District in 2005. The mean discharge was 0.26 cubic feet per second (see the table below).

Water quality

Sun Eden Spring was sampled once by USGS in 1997, twice by Lake County in 2004, and twice by the district in 2005. Summary statistics of the water quality data for selected variables are shown in the table below.

Summary statistics of water quality and discharge at Sun Eden Spring

Sun Eden Spring Min Mean Median Max Count Period
Discharge, cfs 0.15 0.26 0.31 0.33 3 1997−2005
Alkalinity, total, mg/L as CaCO3 104.0 107.7 108.4 110.0 4 2004−2005
Calcium, total, mg/L as Ca 31.2 34.3 35.2 35.4 4 2004−2005
Chloride, total, mg/L as Cl 8.1 8.9 8.7 11.0 5 1997−2005
Dissolved Oxygen 0.60 0.70 0.70 0.80 2 2004
Magnesium, total, mg/L as Mg 6.9 7.4 7.4 8.1 4 2004−2005
Nitrate + nitrite, total, mg/L as N 0.01 0.03 0.03 0.05 4 2004−2005
Orthophosphate, total, mg/L as P 0.04 0.04 0.04 0.04 2 2005
pH, field 7.40 7.66 7.68 7.90 5 1997−2005
Phosphorus, total, mg/L as P 0.04 0.04 0.04 0.05 2 2005
Potassium, total, mg/L as K 0.4 0.5 0.5 0.6 2 2004
Sodium, total, mg/L as Na 4.3 4.4 4.4 4.6 4 2004−2005
Specific conductance, field, µmhos/cm at 25°C 257 275 260 324 4 2004−2005
Specific conductance, lab, µmhos/cm at 25°C 243 246 247 249 3 1997−2005
Sulfate, total, mg/L as SO4 7.1 11.6 9.6 20.0 4 1997−2005
Total dissolved solids, mg/L 135 145 142 166 5 1997−2005
Water temperature, °C 23.7 24.4 24.4 25.1 5 1997−2005
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 Sun Eden Spring was determined by measuring the concentration of tritium, carbon-14, and carbon-13 in the spring discharge, which was measured in March 2005. Sun Eden Spring had a tritium concentration of 1.19 tritium units and a carbon-14 concentration of 30 percent modern carbon and a delta carbon-13 value of −9.27 parts per thousand. The tritium concentration suggests that the water is less than 50 years old. The carbon-14 concentration of 30% modern carbon can result from the reaction of rainfall with calcite, dolomite, and soil organic matter.


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