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Top 20 Hazardous Substances

from the 

CERCLA Priority List of Hazardous Substances for 2003


What is the Top 20 List?

The list below contains the Top 20 hazardous substances on the CERCLA Priority List of Hazardous Substances for 2003.  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:
       CERCLA Priority List of Hazardous Substances for 2003

Each of the Top 20 substances listed below is identified with their 2003  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: 


Top 20 Hazardous Substances
from the 2003 CERCLA Priority List of Hazardous Substances

1 ARSENIC
2 LEAD
3 MERCURY
4 VINYL CHLORIDE
5 POLYCHLORINATED BIPHENYLS
6 BENZENE
7 CADMIUM
8 POLYCYCLIC AROMATIC HYDROCARBONS
9 BENZO(A)PYRENE
10 BENZO(B)FLUORANTHENE
11 CHLOROFORM
12 DDT, P,P'-
13 AROCLOR 1254
14 AROCLOR 1260
15 DIBENZO(A,H)ANTHRACENE
16 TRICHLOROETHYLENE
17 CHROMIUM, HEXAVALENT
18 DIELDRIN
19 PHOSPHORUS, WHITE
20 CHLORDANE


Contact information: 

Further information can be obtained by contacting the ATSDR Information Center at: 

Agency for Toxic Substances and Disease Registry 
Division of Toxicology 
1600 Clifton Road NE, Mailstop E-29 
Atlanta, GA 30333 
Phone: 1-888-422-8737 
Fax: 1-404-498-0057 
E-mail: ATSDRIC@cdc.gov




ATSDR Information Center / ATSDRIC@cdc.gov / 1-888-422-8737

This page was updated on November 19, 2003


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