Cyclohexylamine: federal lists and state cleanup levels

Federal lists

Extremely hazardous substances (EPCRA)

• 40 CFR part 355, appendix A
• Revised as of July 1, 2025

Appendix A to 40 CFR part 355, the list of extremely hazardous substances, prints a reportable quantity of 10,000 pounds and a threshold planning quantity of 10,000 pounds for CAS 108-91-8.

Appendix A to Part 355—The List of Extremely Hazardous Substances and Their Threshold Planning Quantities

CAS No.	Chemical name	Notes	Reportable quantity * (pounds)	Threshold planning quantity (pounds)
108-91-8	Cyclohexylamine	f	10,000	10,000

Environmental Protection Agency

f. Chemicals on the original list that do not meet toxicity criteria but because of their acute lethality, high production volume and known risk are considered chemicals of concern (“Other chemicals”), November 17, 1986 and February 15, 1990.

Notes to Appendix A to Part 355—The List of Extremely Hazardous Substances and Their Threshold Planning Quantities, as the regulation prints them

* Only the statutory or final RQ is shown. For more information, see 40 CFR 355.61.

Notes:

a. This material is a reactive solid. The TPQ does not default to 10,000 pounds for non-powder, non-molten, non-solution form.

b. The calculated TPQ changed after technical review as described in a technical support document for the final rule, April 22, 1987.

c. Chemicals added by final rule, April 22, 1987.

d. Revised TPQ based on new or re-evaluated toxicity data, April 22, 1987.

e. The TPQ was revised due to calculation error, April 22, 1987.

f. Chemicals on the original list that do not meet toxicity criteria but because of their acute lethality, high production volume and known risk are considered chemicals of concern (“Other chemicals”), November 17, 1986 and February 15, 1990.

g. The TPQ was recalculated (September 8, 2003) since it was mistakenly calculated in the April 22, 1987 final rule under the wrong assumption that this chemical is a reactive solid, when in fact it is a liquid. RQ for this chemical was adjusted on September 11, 2006.

Florida

• FL DEP
• Chapter 62-777 CTLs
• February 2005

For Cyclohexylamine, DEP's cleanup target level tables print 1,400 ug/L as the groundwater criterion, 18,000 mg/kg for residential direct exposure to soil and 7.9 mg/kg for soil leachability based on groundwater.

• 1,400ug/L 1400 Groundwater Criteria Table I: Groundwater and Surface Water Cleanup Target Levels
• 18,000mg/kg 18000 Direct Exposure - Residential Table II: Soil Cleanup Target Levels
• 7.9mg/kg Leachability Based on Groundwater Table II: Soil Cleanup Target Levels

All Florida values for Cyclohexylamine

For the federal lists the regulation governs. This page copies the Code of Federal Regulations' annual edition revised as of July 1, 2025, which is kept up to date by the Federal Register; amendments published there since that date are not shown. This page is a reference copy and not a reporting decision. Check the current regulation before relying on a value.

A list with no section on this page has no row with this CAS number. That alone does not put the substance outside the list: the lists also have entries with no CAS number (broad classes, chemical categories, waste streams), which a page filed by CAS number cannot show.

Each agency's own publication governs: its current table, or the published rule where the agency says so. This page is a reference copy and not a cleanup decision. Check each agency's page before relying on a value.

Source

• Environmental Protection Agency, 40 CFR parts 302, 355 and 372, in Title 40 of the Code of Federal Regulations, Parts 300 to 399, revised as of July 1, 2025, as the U.S. Government Publishing Office posts it. File read October 6, 2026.
• Florida Department of Environmental Protection, Cleanup Target Levels for Chapter 62-777, F.A.C., dated February 2005. Files read October 6, 2026.