---
kind: "section"
citation: "40 C.F.R. § 302.4"
title: "40"
number: "302.4"
heading: "Hazardous substances and reportable quantities."
url: "https://uscodex.org/cfr/40/302.4"
---

# §302.4. Hazardous substances and reportable quantities.

- (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)](/cfr/40/102.md?p=a) of the Act.
- (b) **Unlisted hazardous substances.** A solid waste, as defined in [40 CFR 261.2](/cfr/40/261.2.md), which is not excluded from regulation as a hazardous waste under [40 CFR 261.4(b)](/cfr/40/261.4.md?p=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](/cfr/40/261.20..261.24.md).

  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).


## Notes

### Authority

Authority: 33 U.S.C. 1251 et. seq., 42 U.S.C. 9601 et. seq. , 42 U.S.C. 9602, 42 U.S.C. 9603.

### Source

Source: 50 FR 13474, Apr. 4, 1985, unless otherwise noted.