10 CFR § 1021.101 - Definitions.

---
identifier: "/us/cfr/t10/s1021.101"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "10 CFR § 1021.101 - Definitions."
title_number: 10
title_name: "Energy"
section_number: "1021.101"
section_name: "Definitions."
chapter_name: "DEPARTMENT OF ENERGY (GENERAL PROVISIONS)"
part_number: "1021"
part_name: "NATIONAL ENVIRONMENTAL POLICY ACT IMPLEMENTING PROCEDURES"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 7101  42 U.S.C. 4321  50 U.S.C. 2401"
regulatory_source: "90 FR 29682, July 3, 2025, unless otherwise noted."
cfr_part: "1021"
---


# 1021.101 Definitions.

As used in these implementing procedures, terms have the meanings provided in NEPA section 111, 42 U.S.C. 4336e. In addition:

*CERCLA-excluded petroleum and natural gas products* means petroleum, including crude oil or any fraction thereof, that is not otherwise specifically listed or designated as a hazardous substance under section 101(14) of the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) (42 U.S.C. 9601.101(14)) and natural gas, natural gas liquids, liquefied natural gas, or synthetic gas usable for fuel or of pipeline quality (or mixtures of natural gas and such synthetic gas).

*Contaminant* means a substance identified within the definition of contaminant in section 101(33) of CERCLA (42 U.S.C. 9601.101(33)).

*Hazardous substance* means a substance identified within the definition of hazardous substances in section 101(14) of CERCLA (42 U.S.C. 9601.101(14)). Radionuclides are hazardous substances through their listing under section 112 of the Clean Air Act (42 U.S.C. 7412) (40 CFR part 61, subpart H).

*Pollutant* means a substance identified within the definition of pollutant in section 101(33) of CERCLA (42 U.S.C. 9601.101(33)).