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The Castle Hayne aquifer is an eastward sloping and thickening wedge of limestone and sandstone (fig. 1), which is located in a 12,500 square-mile area in the eastern part of North Carolina (fig. 2). The Castle Hayne aquifer is the major source of freshwater for much of coastal North Carolina, and, in many parts of eastern North Carolina where the aquifers underlying the Castle Hayne contain saltwater (fig. 1), it is the only source of freshwater. The Castle Hayne also is the most productive aquifer in the State; more water is pumped from it than any other single aquifer, and maximum yields of individual wells are greater than yields from wells tapping other aquifers. Over 100 million gallons of water per day &t*e withdrawn for municipal, industrial (including mining and quarrying), and irrigation uses. Well yields commonly range from 200 to 500 gallons per minute, although yields have been known to exceed 2.000 gallons per minute. The freshwater and saltwater parts of the aquifers in eastern North Carolina are shown in figure 1. Saltwater is defined as containing more than 250 milligrams of chloride per liter of water, the limit used as a drinking water standard by the U.S. Environmental Protection Agency. The Castle Hayne aquifer is filled with water that contains less than 250 milligrams of chloride per liter in the freshwater area and with water exceeding that concentration in the saltwater area. Throughout extensive areas, freshwater is found in the upper part of the aquifer and saltwater is found in the lower part.

Regional study of the Castle Hayne Aquifer of eastern North Carolina