The International Symposium on Bacterial Indicators of Potential Health Hazards Associated With Water was held 28-29 June 1976 at Chicago, Ill. The American Society for Testing and Material's Committee D19 on Water sponsored the symposium, and A. W. Hoadley, Georgia Institute of Technology, served as symposium chairman. B. J. Dutka, Canada Centre for Inland Waters, and A. W. Hoadley served as editors of this publication.