This paper presents a compilation and summary of design criteria, performance, and cost data from 22 operating municipal and industrial granular activated carbon (GAC) installations that treat water and wastewater or process food and beverage products. Guidance for using this information to estimate costs for GAC treatment of water supplies is provided. In conjunction with previous reports, this article may be used to obtain project specific cost estimates for water treatment. Although this article does not provide design criteria such as required contact time, probable regeneration frequency, activated carbon reactivation system criteria, or activated carbon transfer guidelines, it presents an approach to determining such design data for water systems.