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The Upper Floridan aquifer is the sole source of water supply for the city of Valdosta, Ga., and much of the surrounding area. Users and water-resources managers and developers are concerned about the quality of water in the aquifer. The water quality of a large part of the Upper Floridan aquifer in the Valdosta area is affected by direct recharge of water from the Withlacoochee River to the aquifer through sinkholes in the river channel north of Valdosta. Furthermore, because the Withlacoochee River receives little filtration as it recharges the aquifer in this area, ground water might be vulnerable to contamination as a result of human activities within the Withlacoochee River basin. Stream-discharge and water-quality data from 17 surface-water sites and ground-water-quality data from 111 wells in the vicinity of Valdosta, Ga., are presented for the period 1961-93. Also, ground-water-level data for the Upper Floridan aquifer in the Valdosta area are presented in a series of potentiometric-surface maps. The waterresources data were collected mostly in Lowndes County in the vicinity of Valdosta and lesser amounts were collected in surrounding Berrien, Brooks, Cook, Echols, and Lanier Counties. INTRODUCTION The Upper Floridan aquifer is the sole source of water supply for the city of Valdosta, Ga., and much of the surrounding area. The aquifer yields an ample supply of water; however, there are concerns by users and waterresources managers and developers about the quality of water in the aquifer. The water quality of a large part of the Upper Floridan aquifer in the Valdosta area is affected by direct recharge of water from the Withlacoochee River to the Upper Floridan aquifer through sinkholes in the river channel north of Valdosta. Furthermore, because the Withlacoochee River receives little filtration as it recharges the aquifer in this area, ground water in the Valdosta area might be vulnerable to contamination as a result of human activities within the Withlacoochee River basin. Concern about the quality and quantity of ground water in the Valdosta area has resulted in several waterresources investigations conducted during the period 1974 to 1993 by the U.S. Geological Survey (USGS) in cooperation with other Federal, State and local agencies. In cooperative studies with the city of Valdosta, Krause (1976) reported on the occurrence and distribution of ground water affected by recharge of water from the Withlacoochee River. McConnell and Hacke (1993) reported on the hydrogeology, water quality, and waterresources development potential in the Valdosta area. Currently (1990-94), the USGS, in cooperation with the city of Valdosta, is conducting an investigation to age-date ground water in the Valdosta area using chlorofluoro-carbons and other tracers of ground-water flow. In yet another cooperative study between the USGS and the Georgia Department of Natural Resources, Environmental Protection Division (EPD), Georgia Geologic Survey, Krause (1979) reported on the geohydrology of Brooks, Lowndes, and Echols Counties in the vicinity of Valdosta, Ga. In addition to these cooperative investigations, the USGS is conducting ongoing cooperative statewide datacollection programs which includes Valdosta and the surrounding area. Water-quality and stream-discharge data are collected monthly at a site on the Withlacoochee River above Valdosta as part of an ongoing water-quality, trendmonitoring program with EPD, Water Protection Branch. Stream discharge of the Withlacoochee River above Valdosa and ground-water levels in a shallow aquifer and in several wells open to the Upper Floridan aquifer are continuously monitored as part of a data-collection program with the city of Valdosta. Water-quality and streamdischarge data (Stokes and McFarlane, 1994) and ground-water-level data for sites in the Valdosta area (Joiner and Cressler, 1994) are published annually in USGS water-resources data and ground-water conditions reports for Georgia. Additonal information can be obtained from the District Chief, USGS, Peachtree Business Center, 3039 Amwiler Road, Suite 130, Atlanta, GA 30360-2824. The cooperative studies and data-collection programs have produced a vast amount of water-quality, streamdischarge, and water-level data. Part of the data currently appears in basic-data reports and in interpretive reports. Generally, the interpretive reports do not report all data that were collected as a part of a study. Thus, compiling and documenting the data in a single publication will provide a useful water-resources reference for the Valdosta area.

Water-resources data for the Valdosta area, south-central Georgia, 1961-93