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

For Osmium tetroxide, cas no. is 20816-12-0; cercla rq (lbs) is 1000; rcra waste number is P087; regulatory categories is 4, verified against its source on 2026-08-05.

- **Substance:** Osmium tetroxide _(verified: appears in the quote below)_
- **CAS No.:** 20816-12-0 _(verified: appears in the quote below)_
- **CERCLA RQ (lbs):** 1000 _(verified: appears in the quote below)_
- **RCRA waste number:** P087 _(verified: appears in the quote below)_
- **Regulatory categories:** 4 _(verified: appears in the quote below)_

## What the source says

> Osmium tetroxide | 20816-12-0 | 4 | P087 | 1000 (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/).