---
kind: "section"
citation: "40 C.F.R. § 180.473"
title: "40"
number: "180.473"
heading: "Glufosinate; tolerances for residues."
url: "https://uscodex.org/cfr/40/180.473"
---

# §180.473. Glufosinate; tolerances for residues.

- (a) **General.**
  - (1) Tolerances are established for residues of glufosinate, including its metabolites and degradates, in or on the commodities in table 1 to [paragraph (a)(1)](#a-1). Compliance with the tolerance levels specified in table 1 to [paragraph (a)(1)](#a-1) is to be determined by measuring the sum of glufosinate (2-amino-4-(hydroxymethylphosphinyl)butanoic acid) and its metabolites, 2-(acetylamino)-4-(hydroxymethyl phosphinyl) butanoic acid, and 3-(hydroxymethylphosphinyl) propanoic acid, expressed as 2-amino-4-(hydroxymethylphosphinyl)butanoic acid equivalents.
  - (2) Tolerances are established for residues of glufosinate-P, including its metabolites and degradates, in or on the commodities in table 2 to [paragraph (a)(2)](#a-2), as a result of applications of glufosinate-P or glufosinate-P-ammonium to those commodities. Compliance with the tolerance levels specified in table 2 to [paragraph (a)(2)](#a-2) is to be determined by measuring the sum of glufosinate (2-amino-4-(hydroxymethylphosphinyl) butanoic acid) and its metabolites, 2-(acetylamino)-4-(hydroxymethyl phosphinyl) butanoic acid, and 3-(hydroxymethylphosphinyl) propanoic acid, expressed as 2-amino-4-(hydroxymethylphosphinyl)butanoic acid equivalents.
- (b) [Reserved]
- (c) **Tolerances with regional registrations.** Tolerances with regional registrations are established for residues of glufosinate, including its metabolites and degradates, in or on the commodities in table 3 to [paragraph (c)](#c). Compliance with the tolerance levels specified in table 3 to [paragraph (c)](#c) is to be determined by measuring the sum of glufosinate, (2-amino-4-(hydroxymethylphosphinyl)butanoic acid) and its metabolites, 2-(acetylamino)-4-(hydroxymethyl phosphinyl) butanoic acid, and 3-(hydroxymethylphosphinyl) propanoic acid, expressed as 2-amino-4-(hydroxymethylphosphinyl)butanoic acid equivalents.
- (d) **Indirect or inadvertent residues.**
  - (1) Tolerances are established for indirect or inadvertent residues of glufosinate, including its metabolites and degradates, in or on the commodities in table 4 to [paragraph (d)(1)](#d-1), as a result of the application of glufosinate to crops listed in [paragraph (a)](#a) of this section. Compliance with the tolerance levels specified in table 4 to [paragraph (d)(1)](#d-1) is to be determined by measuring the sum of glufosinate (2-amino-4-(hydroxymethylphosphinyl) butanoic acid) and its metabolite, 3-(hydroxymethylphosphinyl) propanoic acid, expressed as 2-amino-4-(hydroxymethylphosphinyl)butanoic acid equivalents.
  - (2) Tolerances are established for indirect or inadvertent residues of glufosinate-P, including its metabolites and degradates, in or on the commodities in table 5 to [paragraph (d)(2)](#d-2), as a result of the application of glufosinate-P or glufosinate-P-ammonium to crops listed in [paragraph (a)(2)](#a-2) of this section. Compliance with the tolerance levels specified in table 5 to [paragraph (d)(2)](#d-2) is to be determined by measuring the sum of glufosinate (2-amino-4-(hydroxymethylphosphinyl) butanoic acid) and its metabolite, 3-(hydroxymethylphosphinyl) propanoic acid, expressed as 2-amino-4-(hydroxymethylphosphinyl)butanoic acid equivalents.”

## Notes

### Amendments

[68 FR 55849, Sept. 29, 2003, as amended at 71 FR 25945, May 3, 2006; 72 FR 72625, Dec. 21, 2007; 76 FR 23497, Apr. 27, 2011; 77 FR 59113, Sept. 26, 2012; 80 FR 72599, Nov. 20, 2015; 84 FR 21708, May 15, 2019; 87 FR 57626, Sept. 21, 2022; 88 FR 39780, June 20, 2023; 89 FR 85865, Oct. 29, 2024; 90 FR 52256, Nov. 20, 2025; 91 FR 7121, Feb. 17, 2026]

### Authority

Authority: 21 U.S.C. 321(q), 346a and 371.

### Source

Source: 36 FR 22540, Nov. 25, 1971, unless otherwise noted.

### Amendments

[68 FR 55849, Sept. 29, 2003, as amended at 71 FR 25945, May 3, 2006; 72 FR 72625, Dec. 21, 2007; 76 FR 23497, Apr. 27, 2011; 77 FR 59113, Sept. 26, 2012; 80 FR 72599, Nov. 20, 2015; 84 FR 21708, May 15, 2019; 87 FR 57626, Sept. 21, 2022; 88 FR 39780, June 20, 2023; 89 FR 85865, Oct. 29, 2024; 90 FR 52256, Nov. 20, 2025; 91 FR 7121, Feb. 17, 2026]