Waste 2 Resources > PBT Initiative > The PBT List

The PBT List

The PBT List includes the "worst of the worst". Substances were placed on this list according to a selection process included in the PBT Rule. Consult the PBT Rule for a complete list of all chemicals and their Chemical Abstracts Service (CAS) Registry Numbers.*

Chemicals	Aldrin
	Chlordane
	Chlordecone (Kepone)
	Dichlorodiphenyltrichloroethane (DDT)
	Dieldrin
	Endrin
	Heptachlor/Heptachlor epoxide
	Hexabromobiphenyl
	Hexabromocyclododecane
	Hexachlorobutadiene
	Methyl mercury
	Mirex
	Pentachlorobenzene
	Short-chain chlorinated paraffins
	Tetrabromobisphenol A
	Tetrachlorobenzene, 1,2,4,5-
	Toxaphene
Chemical groups	Perfluorooctane sulfonates (PFOS)
	Polycyclic aromatic hydrocarbons (PAHs)*
	Polybrominated dibenzodioxins and furans
	Polybrominated diphenyl ethers (PBDEs)
	Polychlorinated biphenyls (PCBs)
	Polychlorinated dibenzo-p-dioxins*
	Polychlorinated dibenzofurans
	Polychlorinated naphthalenes
Metals of concern	Cadmium
	Lead

*Note: Two CAS numbers are listed incorrectly in the PBT rule:

• The correct CAS number for 1,2,3,6,7,8 Hexachlorodibenzo-p-dioxin is 57653-85-7.
• The correct CAS number for dibenzo(a,h)pyrene is 189-64-0.

These errors will be corrected in a future update of the PBT rule.