Superfund or Comprehensive Environmental Response, Compensation, and Liability Act of 1980 is a United States federal law designed to clean up sites contaminated with hazardous substances as well as broadly define "pollutants or contaminants". EPA may identify parties responsible for hazardous substances releases to the environment and compel those parties to clean up the sites, or it may cleanup itself using the Superfund and cost recover from responsible parties by referring such matters to the U.S. Department of Justice. The key difference between the authority to address hazardous substances and pollutants or contaminants is that the cleanup of pollutants or contaminants which are not hazardous substances cannot be compelled by unilateral administrative order.