Groundwater reserves in West Virginia are contained in the consolidated rock underlying the State and in the alluvium bordering the Ohio and Kanawha Rivers. The consolidated rock (bedrock) that crops out in the study area, which includes parts of Fayette, Kanawha, Mason, and Putnam Counties in south-central West Virginia, is of Pennsylvanian or Permian age. Alluvial deposits in the study area are limited mostly to the flood plain of the Kanawha River. The alluvium is not vertically homogenous; the lower part of the deposits consists mostly of sand with some gravel, and the upper part consists of clay and silt. In comparison to the Ohio River alluvium, the Kanawha River alluvium is less permeable and yields less ground water to wells. Ground water flows from the adjacent hills toward the river about 90 percent of the time. The alluvium is recharged by the following sources: (1) Inflow from fractures in the bedrock beneath and adjacent to the alluvium, (2) the Kanawha River at high stage, (3) inflow from tributary streams, and (4) precipitation on the floodplain. The water level in the alluvium and in the bedrock fracture system beneath the alluvium depends on the Kanawha River stage. In some groundwater samples, concentrations of chloride, iron, manganese, sulfate, barium, cadmium, lead, phenols, and zinc exceeded recommended limits for drinking water established by the West Virginia State Board of Health. Groundwater hardness exceeded 120 milligrams per liter in only 29 percent of the samples. 1.0 INTRODUCTION 1.1 Acknowledgments The authors appreciate the cooperation of the corporations, municipalities, and private well owners who provided information about their wells and permitted samples of water to be taken for analysis. The cooperation of well drillers who provided well logs and well construction data also is acknowledged. Special appreciation is given to Dr. Steven M. Zekan, who provided access to his well and allowed the authors to install an automatic water-level recorder on it.