40 CFR § 164.21 - Contents of a denial of registration, notice of intent to cancel a registration, or notice of intent to change a classification.

---
identifier: "/us/cfr/t40/s164.21"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 164.21 - Contents of a denial of registration, notice of intent to cancel a registration, or notice of intent to change a classification."
title_number: 40
title_name: "Protection of Environment"
section_number: "164.21"
section_name: "Contents of a denial of registration, notice of intent to cancel a registration, or notice of intent to change a classification."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "E"
subchapter_name: "PESTICIDE PROGRAMS"
part_number: "164"
part_name: "RULES OF PRACTICE GOVERNING HEARINGS, UNDER THE FEDERAL INSECTICIDE, FUNGICIDE, AND RODENTICIDE ACT, ARISING FROM REFUSALS TO REGISTER, CANCELLATIONS OF REGISTRATIONS, CHANGES OF CLASSIFICATIONS, SUSPENSIONS OF REGISTRATIONS AND OTHER HEARINGS CALLED PURSUANT TO SECTION 6 OF THE ACT"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "7 U.S.C. 136d."
regulatory_source: "38 FR 19371, July 20, 1973, unless otherwise noted."
cfr_part: "164"
---


# 164.21 Contents of a denial of registration, notice of intent to cancel a registration, or notice of intent to change a classification.

(a) *Contents.* The denial of registration or a notice of intent to cancel a registration or to change a classification shall be accompanied by the reasons (including the factual basis) for the action.

(b) *Amendments to contents of denials and notices.* Such documents under this section may be amended or enlarged by the Administrator at any time prior to the commencement of the public hearing. If the Administrative Law Judge determines that additional time is necessary to permit a party to prepare for matters raised by such amendments, the commencement of the hearing shall be delayed for an appropriate period.