# 1,4-Dioxane — US federal chemical regulatory reporting thresholds by program (CERCLA, EPCRA, CAA)

For 1,4-Dioxane, cas no. is 123-91-1; cercla rq (lbs) is 100; rcra waste number is U108; regulatory categories is 3,4, verified against its source on 2026-08-05.

- **Substance:** 1,4-Dioxane _(verified: appears in the quote below)_
- **CAS No.:** 123-91-1 _(verified: appears in the quote below)_
- **CERCLA RQ (lbs):** 100 _(verified: appears in the quote below)_
- **RCRA waste number:** U108 _(verified: appears in the quote below)_
- **Regulatory categories:** 3,4 _(verified: appears in the quote below)_

## What the source says

> 1,4-Dioxane | 123-91-1 | 3,4 | U108 | 100 (45.4)

## Source

- https://www.ecfr.gov/current/title-40/chapter-I/subchapter-J/part-302/section-302.4

Last verified: 2026-08-05. Review by: 2027-08-05.
Part of [US federal chemical regulatory reporting thresholds by program (CERCLA, EPCRA, CAA)](https://referencesource.org/chemical-regulatory-reporting-thresholds/).