40 CFR § 725.426 - Applicability of the Tier I exemption.

---
identifier: "/us/cfr/t40/s725.426"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 725.426 - Applicability of the Tier I exemption."
title_number: 40
title_name: "Protection of Environment"
section_number: "725.426"
section_name: "Applicability of the Tier I exemption."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "R"
subchapter_name: "TOXIC SUBSTANCES CONTROL ACT"
part_number: "725"
part_name: "REPORTING REQUIREMENTS AND REVIEW PROCESSES FOR MICROORGANISMS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "15 U.S.C. 2604, 2607, 2613, and 2625."
regulatory_source: "62 FR 17932, Apr. 11, 1997, unless otherwise noted."
cfr_part: "725"
---


# 725.426 Applicability of the Tier I exemption.

The Tier I exemption under § 725.424 applies only to a manufacturer or importer of a new microorganism that certifies that the microorganism will be used in all cases in compliance with §§ 725.420, 725.421, and 725.422.