The most important sources of ground water for Wilson County, North Carolina are (1) the sand beds of the Cretaceous aquifer system in the Coastal Plain section in the eastern part of the county and (2) the bedrock aquifer system in the Piedmont section in the western part of the county. The Cretaceous aquifer is recharged from leakage through overlying beds composed primarily of clay. This leakage rate averages about 67,000 gallons per day per square mile. Present withdrawals from the Cretaceous aquifer average about 740 gallons per day per square mile. Most of the withdrawals from the Cretaceous aquifer are in the Saratoga-Stantonsburg area in eastern Wilson County around which a widespread decline in water level has occurred in the aquifer. Since 1942, the rate of decline has averaged nearly 1.5 feet per year in the center of the pumping area. Availability of water to the bedrock aquifer ranges from about 67,000 gallons per day per square mile in the Coastal Plain section of the county to about 630,000 gallons per day per square mile in the Piedmont section. Present pumpage from the bedrock aquifer in the Piedmont section is estimated to be about 2,300 gallons per square mile. Ground-water quality is generally good in the Cretaceous and bedrock aquifers, except iron concentrations in the water exceed 0.3 milligrams per liter nearly everywhere in the county.