The International Symposium on Bacterial Indicators of PotentialHealth Hazards Associated With Water was held 28-29 June 1976 atChicago, Ill. The American Society for Testing and Material'sCommittee 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 servedas editors of this publication.