# Phosphorothioic Acid, O,O-Dimethyl-S-(2-Methylthio) Ethyl Ester — US federal chemical regulatory reporting thresholds by program (CERCLA, EPCRA, CAA)

For Phosphorothioic Acid, O,O-Dimethyl-S-(2-Methylthio) Ethyl Ester, cas no. is 2587-90-8; epcra tpq (lbs) is 500; epcra rq (lbs) is 500, verified against its source on 2026-08-05.

- **Substance:** Phosphorothioic Acid, O,O-Dimethyl-S-(2-Methylthio) Ethyl Ester _(verified: appears in the quote below)_
- **CAS No.:** 2587-90-8 _(verified: appears in the quote below)_
- **EPCRA TPQ (lbs):** 500 _(verified: appears in the quote below)_
- **EPCRA RQ (lbs):** 500 _(verified: appears in the quote below)_

## What the source says

> 500 | 2587-90-8 | Phosphorothioic Acid, O,O-Dimethyl-S-(2-Methylthio) Ethyl Ester |

## 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/).