40 CFR § 355.12 - What quantities of extremely hazardous substances trigger emergency planning requirements?

---
identifier: "/us/cfr/t40/s355.12"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 355.12 - What quantities of extremely hazardous substances trigger emergency planning requirements?"
title_number: 40
title_name: "Protection of Environment"
section_number: "355.12"
section_name: "What quantities of extremely hazardous substances trigger emergency planning requirements?"
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "J"
subchapter_name: "SUPERFUND, EMERGENCY PLANNING, AND COMMUNITY RIGHT-TO-KNOW PROGRAMS"
part_number: "355"
part_name: "EMERGENCY PLANNING AND NOTIFICATION"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "Sections 302, 303, 304, 325, 327, 328, and 329 of the Emergency Planning and Community Right-to-Know Act of 1986 (EPCRA) (42 U.S.C. 11002, 11003, 11004, 11045, 11047, 11048, and 11049)."
regulatory_source: "73 FR 65462, Nov. 3, 2008, unless otherwise noted."
cfr_part: "355"
---


# 355.12 What quantities of extremely hazardous substances trigger emergency planning requirements?

Any EHS present at your facility in an amount equal to or greater than its TPQ triggers the emergency planning requirements of this subpart. The TPQs are listed in Appendices A and B of this part in the column labeled “threshold planning quantity.”