• The List of Hazardous Substances and Reportable Quantities immediately following the HMT table contains substances that are considered hazardous only when the amount in a package equals or exceeds the reportable quantity (RQ).
• Any release of a reportable quantity into the environment must be reported immediately to the National Response Center.

The List of Hazardous Substances and Reportable Quantities can be found in Appendix A to 172.101, immediately following the Hazardous Materials Table (HMT). It contains substances that are considered hazardous only when shipped in a quantity, in one package, that equals or exceeds the reportable quantity (RQ) listed in the table. Before transporting a hazardous material, users must always check this list to see if the material (or an ingredient of the material) is also considered a hazardous substance.

Reportable quantity (Hazmat)

Hazardous substances that are transported at or above their reportable quantities must be identified on shipping papers and packagings with the letters “RQ.” Any release of a reportable quantity into the environment must be reported immediately to the National Response Center (1-800-424-8802).

Example: Acenaphthene is considered a hazardous substance if transported in quantities of 100 pounds or more in one package. In contrast, Acetamide, N-9H-fluoren-2-yl- is considered a hazardous substance starting at 1 pound in one package.