Superfund is a United States federal government program designed to fund the cleanup of sites contaminated with hazardous substances and pollutants. It was established by the Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (CERCLA). It authorizes federal natural resource agencies, primarily the Environmental Protection Agency (EPA), states and Native American tribes to recover natural resource damages caused by hazardous substances, though most states have and most often use their own versions of CERCLA. CERCLA created the Agency for Toxic Substances and Disease Registry (ATSDR). EPA may identify parties responsible for hazardous substances releases to the environment (polluters) and either compel them to clean up the sites, or it may undertake the cleanup on