21 CFR § 510.203 - Initiation of a proceeding to establish or amend an import tolerance.

---
identifier: "/us/cfr/t21/s510.203"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "21 CFR § 510.203 - Initiation of a proceeding to establish or amend an import tolerance."
title_number: 21
title_name: "Food and Drugs"
section_number: "510.203"
section_name: "Initiation of a proceeding to establish or amend an import tolerance."
chapter_name: "FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES"
subchapter_number: "E"
subchapter_name: "ANIMAL DRUGS, FEEDS, AND RELATED PRODUCTS"
part_number: "510"
part_name: "NEW ANIMAL DRUGS"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "21 U.S.C. 321, 331, 351, 352, 353, 360b, 371, 379e."
regulatory_source: "40 FR 13807, Mar. 27, 1975, unless otherwise noted."
cfr_part: "510"
---


# 510.203 Initiation of a proceeding to establish or amend an import tolerance.

(a) Any interested person may request that the Commissioner establish or amend an import tolerance. Such a request must be in the form specified in § 510.205 of this chapter.

(b) The Commissioner may initiate a proceeding to establish or amend an import tolerance on his or her own initiative pursuant to § 10.25(b) of this chapter.