# 1,3-Pentadiene — US federal chemical regulatory reporting thresholds by program (CERCLA, EPCRA, CAA)

For 1,3-Pentadiene, cas no. is 504-60-9; cercla rq (lbs) is 100; rcra waste number is U186; regulatory categories is 4, verified against its source on 2026-08-05.

- **Substance:** 1,3-Pentadiene _(verified: appears in the quote below)_
- **CAS No.:** 504-60-9 _(verified: appears in the quote below)_
- **CERCLA RQ (lbs):** 100 _(verified: appears in the quote below)_
- **RCRA waste number:** U186 _(verified: appears in the quote below)_
- **Regulatory categories:** 4 _(verified: appears in the quote below)_

## What the source says

> 1,3-Pentadiene | 504-60-9 | 4 | U186 | 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/).