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

For Arsenous Oxide, cas no. is 1327-53-3; epcra tpq (lbs) is 100/10,000; epcra rq (lbs) is 1, recorded from its source on 2026-08-05.

- **Substance:** Arsenous Oxide _(verified: appears in the quote below)_
- **CAS No.:** 1327-53-3 _(verified: appears in the quote below)_
- **EPCRA TPQ (lbs):** 100/10,000 _(verified: appears in the quote below)_
- **EPCRA RQ (lbs):** 1

## What the source says

> 100/10,000 | 1327-53-3 | Arsenous Oxide |

## Source

- https://www.ecfr.gov/current/title-40/chapter-I/subchapter-J/part-355

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/).