The ground‐water of the Florida Peninsula constitutes one of its most valuable natural resources and is of importance as a source of water‐supplies throughout the area. The problems relating to the development of ground‐water supplies are both quantitative and qualitative. They include such problems as the decline in yield of wells in areas of large withdrawals of water and salt‐water contamination of ground‐water supplies. In order to facilitate a better understanding and interpretation of hydrologic conditions relating to these local ground‐water problems, a general survey of the artesian water in the Florida Peninsula was made by the United States Geological Survey in 1934.