Floridan aquifer

The Floridan aquifer system, composed of the Upper and Lower Floridan aquifers, is a sequence of Paleogene carbonate rock which spans an area of about 100,000 square miles (260,000 km2) in the southeastern United States. It underlies the entire state of Florida and parts of Alabama, Georgia, Mississippi, and South Carolina.

The Floridan aquifer system is one of the world's most productive aquifers and supplies drinking water for nearly 10 million people. According to the United States Geological Survey, total withdrawals from the Floridan aquifer system in 2000 were ranked 5th highest of all principal aquifers in the nation at 3,640 million gallons per day (Mgal/d) (13.8 million m3/d; 11,200 acre⋅ft/d). Usage was broken down as 49% (1,949 Mgal/d; 7.38 million m3/d; 5,980 acre⋅ft/d) for irrigation, 33% (1,329 Mgal/d; 5.03 million m3/d; 4,080 acre⋅ft/d) for public water supply, 14% (576 Mgal/d, 2.18 million m3/d; 1,770 acre⋅ft/d) for industrial purposes, and 4% for domestic self-supplied withdrawals. The system is the primary source of drinking water for most cities in central and northern Florida as well as eastern and southern Georgia.

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