StacksVerified U.S. regulatory reference

40 CFR §302.4

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)Listed hazardous substances. The elements and compounds and hazardous wastes appearing in table 302.4 are designated as hazardous substances under section 102(a) of the Act.
  2. (b)Unlisted hazardous substances. A solid waste, as defined in 40 CFR 261.2, which is not excluded from regulation as a hazardous waste under 40 CFR 261.4(b), is a hazardous substance under section 101(14) of the Act if it exhibits any of the characteristics identified in 40 CFR 261.20 through 261.24.
Appendix A to § 302.4 lists CERCLA hazardous substances in sequential order by CASRN and provides a per-substance grouping of regulatory synonyms (i.e., names by which each hazardous substance is identified in other statutes and their implementing regulations).