In the reauthorization of the Clean Water Act in 1987, the U.S. EPA specifically addressed toxics management. In addition to the requirement to eliminate discharge of toxics, there can be a requirement to conduct a toxicity reduction evaluation (TRE). The scope of toxicity reduction varies from the very simple and inexpensive to the highly complex and costly. This book, volume three of the Water Quality Management Library, provides a complete overview of toxicity reduction evaluation. The book presents the testing and removal of toxicants, toxicity testing procedures, sampling techniques, baseline collection data, and source identification. Plus, the book presents toxicity reduction methodologies including unit processes necessary for organic toxicant control using biological and physical chemical methodologies as well as selected unit processes necessary for inorganic toxicant control.