PREFACE This report is the result of a 4-year investigation dealing with the water resources of Escambia and Santa Rosa counties, Florida. The mild climate and excellent water supplies are prime reasons for industrial de- velopment in this section of Florida. Information on the water resources of the area prior to this investigation was sketchy and based on a minimum of documented data. The purpose of this project was to collect water data to combine with data previously collected into an interpreta- tive report that will be beneficial to water users. In 1958, the U.S. Geological Survey in cooperation with the Florida Geological Survey began a detailed investigation of the surface-water and ground-water resources of Escambia and Santa Rosa counties, Flor- ida. The investigation was financed by the U.S. Geological Survey, the Florida Geological Survey, Escambia and Santa Rosa counties, and the city of Pensacola. The investigation was made by the following personnel of the Water Resources Division of the U.S. Geological Survey: Rufus H. Musgrove, hydraulic engineer, Surface Water Branch; Jack T. Barraclough, hydrau- lic engineer, Ground Water Branch; and Rodney G. Grantham, chemist, Quality of Water Branch. Owen T. Marsh, geologist, Ground Water Branch, did the basic geologic study and was transferred before the completion of the investigation. The work was supervised by A. O. Patterson, district engineer, Surface Water Branch; M. I. Rorabaugh, succeeded by C. S. Conover, district engineers, Ground Water Branch; and J. W. Guerin, district chemist, succeeded by K. A. Mac Kichan, district engineer, Quality of Water Branch. Appreciation is expressed to the many individuals who furnished in- formation and in particular to the following persons for providing infor- mation and extending courtesies which greatly facilitated the investiga- tion: M. E. Batz, B. T. Dean, C. P. Neiswender, and C. A. Witcher, Jr.- The Chemstrand Corporation D. W. Young, C. E. Adams, and J. A. Hamm, Jr.-St. Regis Paper Company E. L. Russell, W. E. Moore, H. E. Province, Duncan Goldthwaite, J. F. Schindler, and J. S. Porter-The California Company R. C. Howard and M. F. Kirby-Gulf Oil Corporation Stanley Sweeney and J. P. Bowers-Water Department, city of Pensacola