# 2-Butanone — US federal chemical regulatory reporting thresholds by program (CERCLA, EPCRA, CAA)

For 2-Butanone, cas no. is 78-93-3; cercla rq (lbs) is 5000; rcra waste number is U159; regulatory categories is 4, verified against its source on 2026-08-05.

- **Substance:** 2-Butanone _(verified: appears in the quote below)_
- **CAS No.:** 78-93-3 _(verified: appears in the quote below)_
- **CERCLA RQ (lbs):** 5000 _(verified: appears in the quote below)_
- **RCRA waste number:** U159 _(verified: appears in the quote below)_
- **Regulatory categories:** 4 _(verified: appears in the quote below)_

## What the source says

> 2-Butanone | 78-93-3 | 4 | U159 | 5000 (2270)

## 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/).