Prepared papers of the speakers at the workshop on the Identification, Evaluation, and Control of Toxic Substances in Industrial Effluents, held at the Conrad Hilton Hotel; Chicago, Illinois, on June 15-16, 1982. The workshop was designed for academia, industry, and government and focused on the surfacing, evaluation, and control of toxic substances in wastewater discharges. The technical presentations featured actual case histories on the use of detailed manufacturing process evaluation to surface toxicants, the use of manufacturing process modification to eliminate or reduce the formation of toxicants, and the analysis of chemical structure/activity relationships to predict the potential for toxicity, persistance, bioaccumulation, mutagenicity, etc. The workshop was co-sponsored by the U.S. Environmental Protection Agency, the U.S. Department of Commerce, the Illinois Chamber of Commerce, and the Illinois Institute of Technology. The appendix contains a list of attendees.