Site Feedback

Title 24

Displaying title 24, up to date as of 6/15/2026. Title 24 was last amended 6/12/2026.
eCFR Content

The Code of Federal Regulations (CFR) is the official legal print publication containing the codification of the general and permanent rules published in the Federal Register by the departments and agencies of the Federal Government. The Electronic Code of Federal Regulations (eCFR) is a continuously updated online version of the CFR. It is not an official legal edition of the CFR.

Learn more about the eCFR, its status, and the editorial process.

Appendix I to Subpart C of Part 51—Specific Hazardous Substances

The following is a list of specific petroleum products and chemicals defined to be hazardous substances under § 51.201.

Hazardous Liquids

  • Acetic Acid
  • Acetic Anhydride
  • Acetone
  • Acrylonitrile
  • Amyl Acetate
  • Amyl Alcohol
  • Benzene
  • Butyl Acetate
  • Butyl Acrylate
  • Butyl Alcohol
  • Carbon Bisulfide
  • Carbon Disulfide
  • Cellosolve
  • Cresols
  • Crude Oil (Petroleum)
  • Cumene
  • Cyclohexane
  • No. 2 Diesel Fuel
  • Ethyl Acetate
  • Ethyl Acrylate
  • Ethyl Alcohol
  • Ethyl Benzene
  • Ethyl Dichloride
  • Ethyl Ether
  • Gasoline
  • Heptane
  • Hexane
  • Isobutyl Acetate
  • Isobutyl Alcohol
  • Isopropyl Acetate
  • Isopropyl Alcohol
  • Jet Fuel and Kerosene
  • Methyl Alcohol
  • Methyl Amyl Alcohol
  • Methyl Cellosolve
  • Methyl Ethyl Ketone
  • Naptha
  • Pentane
  • Propylene Oxide
  • Toluene
  • Vinyl Acetate
  • Xylene

Hazardous Gases

  • Acetaldehyde
  • Butadiene
  • Butane
  • Ethene
  • Ethylene
  • Ethylene Oxide
  • Hydrogen
  • Liquefied Natural Gas (LNG)
  • Liquefied Petroleum Gas (LPG)
  • Propane
  • Propylene
  • Vinyl Chloride

(Primary Source: “Urban Development Siting with respect to Hazardous Commercial/Industrial Facilities,” by Rolf Jensen and Associates, Inc., April 1982)

[49 FR 5105, Feb. 10, 1984; 49 FR 12214, Mar. 29, 1984]