The Agency for Toxic Substances and Disease Registry (ATSDR) is working with other agencies interested in reducing harm from chemical spills to build a national database. The U.S. Department of Transportation, the National Response Center, state health departments, and the media will provide data about toxic spills. As other toxic spill databases become available, they may be added as well. Combining data from several different sources will give a clearer picture of toxic substance incidents in the United States for prevention activities.