The amendments to the US Safe Drinking Water Act require extensive evaluation of the feasibility of removing organic compounds using granular activated carbon (GAC). To meet deadlines for this technology evaluation, the US Environmental Protection Agency has combined the use of column studies and adsorption modeling with cost models to make projections for the performance of full-scale GAC systems. A representative list of synthetic organic chemicals was studied, and cost and performance results for GAC treatment are presented in this article. Includes 18 references, tables, figures.