Groundwater Conditions of Georgia

Aquifer Characteristics: Water levels measured in 14 wells were used to define conditions in the Surficial aquifer system. Groundwater in the Surficial aquifer system typically is in contact with the atmosphere (referred to as an unconfined or water-table aquifer), but locally, especially in the coastal plain, the water may be under pressure exerted by overlying sediments or rocks (referred to as a confined aquifer). During 2015, about 4.78 million gallons per day (Mgal/d) were withdrawn from the Surficial aquifer system in Georgia, primarily for thermoelectric power, domestic use, and public supply (Painter, 2019). Water levels in the surficial aquifer can change quickly in response to recharge and discharge (for example, precipitation and local pumping, respectively). Consequently, hydrographs from these wells show a strong relation to climatic fluctuations. In parts of the Coastal Plain, the Surficial aquifer system is used as a source of irrigation and drinking-water supply and may show a response to local pumping in addition to precipitation.

Well Locations with Ten Year Trend Icons

   Arrow icons represent upward or downward water-level trend. Water-level trend calculations based on last 10 years of data.
   Circle icon represents slope of trend line with an absolute value that is less than 0.01 feet per year (ft/yr), based on last 10 years of data.
   Split color icons represent wells with graphs.
   Light blue square indicates nearby precipitation gage.
   Diamond icon represents less than 100 monthly-mean water levels from the last 10 years of data.
(Click or hover over map icons for more information.)

Water-level Trends: The table below shows the period of record (POR) and most recent 10-year trends of monthly mean water levels for the 14 Surficial aquifer wells. The data used in the trend analyses are pulled from the USGS National Water Information System: Web Interface (NWISweb), and the trends are calculated in feet per year (ft/yr). The check boxes on the left side of the table allow the reader to compare only those wells of interest by selecting them on or off to appear on the Monthly Mean Composite Graph. The POR and most recent 10-year trend for most of the wells in the Surficial aquifer indicate that water levels have changed little during that time. The POR trend for well 33D072 in Camden County shows a non-linear increase in water levels resulting from decreased industrial pumping in the early 2000s.

Below the table and composite graphs are trend analysis graphs for four select wells. The graphs show mostly seasonal variations, with periodic upward or downward trends that respectively reflect surpluses or deficits in rainfall. These periodic trends tend to be level over the long term unless there is a major change in local pumping (well 33D072). Like the composite graph, the user can click and drag the mouse vertically or horizontally to change the scale and zoom in to the time-period of interest. A simple regression line may be placed on the graph by selecting the Simple Regression button, and the slope of the line is calculated. The slope of the line will be calculated for the specific POR selected for the graph. Any changes to the time scale will require the user to clear and recreate a regression line for the new time scale. To clear the regression line, click on the Clear Regression Line button.

Period of Record (POR) and Previous Calendar Year Summary Table

Well	Period of Record	Previous Calendar Year
	Mean of monthly water levels in feet below land surface	Monthly mean water levels in feet below land surface
39Q029	xxxx	xxxx
07H003	xxxx	xxxx
11AA01	xxxx	xxxx

Period of Record (POR) and Previous Calendar Year Table, updated weekly. Monthly Mean Composite graph updated weekly, all other graphs and tables continuously updated. Negative depths to water indicate water level in feet above land surface.

Slope of trend line for Period of Record (POR) and previous Ten Years

Station Name Data Link	County	POR First Month/Year	POR slope (ft/yr)	Ten Year slope (ft/yr)
33D072	Camden	xx	xx	yy
35P094	Chatham	xx	xx	yy
37P116	Chatham	xx	xx	yy
38Q208	Chatham	xx	xx	yy
39Q029	Chatham	xx	xx	yy
09FF18	Cobb	xx	xx	yy
09G003	Decatur	xx	xx	yy
35H076	Glynn	xx	xx	yy
34H515	Glynn	xx	xx	yy
34J082	Glynn	xx	xx	yy
07H003	Miller	xx	xx	yy
11AA01	Spalding	xx	xx	yy
32L017	Wayne	xx	xx	yy
13M007	Worth	xx	xx	yy

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Slope of 0.00 represents no trend.