The research objectives of this slide presentation were to: evaluate ultraviolet (UV) and UV oxidation treatment for degradation of three endocrine disrupting compounds (EDCs) and subsequent formation of byproducts; develop information on degradation kinetics and hydroxyl radical rate constants for each compound tested; assess changes in toxicity pre- and post- UV treatment (on-going); and, identify and assess the toxicity of each major UV byproduct (on-going). Topics covered include: UV treatment technology/experimental overview; bioanalytical assays review; effectiveness of UV for EDC treatment; and, modeling UV treatment.