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2014 Water quality status and trends report


Note: See Method page for definitions and acronyms used in this section.




(mg/L as CaCO3)

Hardness — An indication of the mineral content of the water, expressed as an equivalent amount of CaCO3. Florida’s groundwater is hard, due to interaction with limestone in the aquifer.

(standard units)

pH — An indication of water acidity on a scale of 0 to 14. A number less than 7 means the water is acidic, while a number greater than 7 means that the water is basic. Changes in pH can be caused by atmospheric deposition (acid rain), geology, vegetation and pollution.

Specific conductance
(uhmhos/cm @ 25° C)

Specific conductance — A measure of water’s resistance to electric current, and functions as an indirect measurement of the water’s salt content. Salinity and specific conductance are well correlated.

Total alkalinity
(mg/L as CaCO3)

Total alkalinity — A measure of water’s ability to neutralize acids (buffering capacity), usually measured in mg/L of CaCO3. More buffering capacity means higher resistance to a pH change as a result of the addition of acidic inputs, such as rain.

Total calcium
(mg/L as Ca)

Total calcium — An abundant alkaline earth metal always found in ionic form in water and an essential mineral for most plants and animals.

Total chloride

Total chloride — An ionized form of the element chlorine, which can be harmful to plants and animals in excess.

Total dissolved solids
(mg/L dried at 180°C)

Total dissolved solids — The amount of solids remaining after evaporating water from a sample, and an indirect measure of the ion concentration in the water.

Total magnesium
(mg/L as Mg)

Total magnesium — A common element essential to plants and animals, and is found in high concentrations in hard water.

Total potassium
(mg/L as K)

Total potassium — An essential element for plants and animals, and is generally found at higher concentrations in marine waters.

Total sodium
(mg/L as Na)

Total sodium — An essential element for plants and animals, and is generally found at higher concentrations in marine waters.

Total sulfate
(mg/L as SO4)

Total sulfate — An oxidized form of sulfur that has both natural and anthrophogenic sources, and can serve as an indicator of water hardness.

Water temperature

Water temperature — Varies seasonally and influences plant and animal growth rates and behavior.

Note: The trend analysis demonstrates change during the report time period. This report does not attempt to analyze the cause of any change, nor the impact of any change.


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