# Arsenic trisulfide — US federal chemical regulatory reporting thresholds by program (CERCLA, EPCRA, CAA)

For Arsenic trisulfide, cas no. is 1303-33-9; cercla rq (lbs) is 1; regulatory categories is 1, verified against its source on 2026-08-05.

- **Substance:** Arsenic trisulfide _(verified: appears in the quote below)_
- **CAS No.:** 1303-33-9 _(verified: appears in the quote below)_
- **CERCLA RQ (lbs):** 1 _(verified: appears in the quote below)_
- **Regulatory categories:** 1 _(verified: appears in the quote below)_

## What the source says

> Arsenic trisulfide | 1303-33-9 | 1 | | 1 (0.454)

## 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/).