This guide to United States toxicology, ecotoxicology, environmental, analytical and support service laboratories is designed to help companies locate those laboratories which can test new and existing chemicals in order to determine potential hazards and risks associated with their manufacture, distribution and use. The health and safety and environmental effects of chemicals are described. The volume gives information on the following: tocixology laboratories (mammalian and related studies); ecotoxicology (aquatic and related studies); environmental effects/fate-analytical services (methods development and analysis); and specialized services eg radio label compound synthesis. It is intended for the use of companies seeking suitable laboratories to conduct reliable studies for either company-sponsored programmes or who are under a requirement to comply with government agency regulations.