The list below contains the Top 20 hazardous substances on the CERCLA Priority List of Hazardous Substances for 2005. The complete list of 275 substances is obtained from an annual evaluation fulfilling the conditions of CERCLA section 104 (i), as amended, which requires ATSDR and EPA to revise the Priority List of Hazardous Substances periodically to include additional hazardous substances.
Further information about the evaluation process and the complete set of 275 substances on the current list can be accessed online at:
Each of the Top 20 substances listed below is identified with their 2005 Rank Number and includes a link to an ATSDR publication, the ToxFAQsTM Sheet, which has further health and chemical information about that substance.
The ATSDR Division of Toxicology has prepared several sets of publications that provide answers to many health concerns that are voiced by community groups and give general information on various properties of each of these substances. Those publications are listed and may be accessed online at:
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Agency for Toxic Substances and Disease Registry
Division of Toxicology and Environmental Medicine
1600 Clifton Road NE, Mailstop F-32
Atlanta, GA 30333
Phone: 1- 800-232-4636 / TTY: 888-232-6348