There is a high probability that GAC will be used more extensively by drinking water utilities. GAC is a proven media for removing synthetic organics from drinking water. A number of utilities, many of them small water systems, have found both volatile (VOC) and synthetic (SOC) organics in their groundwater sources. Off-site or regional reactivation offers the possibility of minimizing GAC replacement costs. Reactivated carbon has been shown to be as effective as virgin carbon. However, a utility that is considering on-site reactivation needs to be aware that mechanical, design, and operational problems can occur. With proper training, a good spare parts inventory, and manufacturer assistance, reactivation units can be maintained and operated effectively.