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 - www.sjrwmd.com

www.sjrwmd.com

Online tools, GIS, data

2014 Water quality status and trends report

Groundwater

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

Analyte

Data

Definition

Hardness
(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.

pH
(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
(mg/L)

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
(°C)

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.

Careers

In this section
Highlights
More about
Careers

Search www.sjrwmd.com

Governing Board meetings
Please see agendas for specific meeting times, which may differ monthly.

Lobbyist registration requirements

Other district meetings and notices

Central Florida Water Initiative

Tell us how
we are doing.

Take our survey on
customer service.

By accessing this site, you agree to accept terms and conditions of the district’s liability disclaimer.

Employee Portal

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