Risk communication skills are imperative for the successful management of crises. Recent U.S. and global events have resulted in heightened recognition by public officials and others responsible for crisis management of the need to evaluate and refine these skills. This report summarizes results from three water security risk communication message mapping workshops conducted by U.S. EPAs National Homeland Security Research Center during 2005/2006. It provides information about effective message development and delivery that could be useful to water sector organizations as they develop their respective risk communication plans. Message mapping is a process by which users can predict 95 percent of questions likely to be asked by the media and others following an incident, prepare clear and concise answers to the questions along with supporting information ahead of time, and practice effective message delivery before a crisis occurs.