Regulations last checked for updates: Feb 13, 2026

Title 40 - Protection of Environment last revised: Dec 22, 2026
All TitlesTitle 40Chapter IPart 180Subpart C - Subpart C—Specific Tolerances
View all text of Subpart C [§ 180.101 - § 180.730]
§ 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). Compliance with the tolerance levels specified in table 1 to paragraph (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.

Table 1 to Paragraph (a)(1)

Commodity Parts per
million
Almond, hulls0.50
Beet, sugar, molasses5.0
Beet, sugar, roots0.9
Beet, sugar, tops (leaves)1.5
Bushberry subgroup 13-07B0.15
Canola, meal1.1
Cattle, fat0.40
Cattle, meat0.15
Cattle, meat byproducts6.0
Corn, field forage4.0
Corn, field, grain0.20
Corn, field, stover6.0
Corn, sweet, forage1.5
Corn, sweet, kernels plus cob with husks removed0.30
Corn, sweet, stover6.0
Cotton, gin byproducts30
Cottonseed subgroup 20C15
Egg0.15
Fig, dried0.15
Fruit, citrus, group 10-100.15
Fruit, pome, group 11-100.25
Fruit, small, vine climbing, except fuzzy kiwifruit, subgroup 13-07F0.05
Fruit, stone, group 12-120.30
Goat, fat0.40
Goat, meat0.15
Goat, meat byproducts6.0
Grain aspirated fractions25
Hog, fat0.40
Hog, meat0.15
Hog, meat byproducts6.0
Hop, dried cones0.9
Horse, fat0.40
Horse, meat0.15
Horse, meat byproducts6.0
Melon subgroup 9A0.08
Milk0.15
Nut, tree, group 14-120.50
Pepper/eggplant subgroup 8-10B0.15
Potato, chips1.6
Potato granules/flakes2.0
Poultry, fat0.15
Poultry, meat0.15
Poultry, meat byproducts0.60
Rapeseed subgroup 20A0.4
Rice, grain 10.9
Rice, grain 21.0
Rice, hull 22.0
Sheep, fat0.40
Sheep, meat0.15
Sheep, meat byproducts6.0
Soybean2.0
Soybean, hulls10
Squash/cucumber subgroup 9B0.15
Tea, dried 10.5
Tea, instant 10.09
Tea, plucked leaves 10.05
Tomato, paste0.15
Tomato subgroup 8-10A0.1
Tropical and subtropical, medium to large fruit, edible peel, subgroup 23B0.1
Tropical and subtropical, medium to large fruit, smooth, inedible peel, subgroup 24B0.2
Tropical and subtropical, small fruit, edible peel, subgroup 23A0.5
Tropical and subtropical, small fruit, inedible peel, subgroup 24A0.1
Vegetable, tuberous and corm, subgroup 1C0.8

1 There are no U.S. registrations as of November 20, 2025.

2 This tolerance expires on May 20, 2025.

(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), 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) 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.

Table 2 to Paragraph (a)(2)

Commodity Parts per
million
Canola, meal1.1
Cattle, fat0.4
Cattle, meat0.15
Cattle, meat byproducts6
Corn, field, forage4
Corn, field, grain0.2
Corn, field, stover6
Corn, sweet, forage1.5
Corn, sweet, kernels plus cob with husks removed0.3
Corn, sweet, stover6
Cotton, gin byproducts30
Cottonseed, subgroup 20C15
Egg0.15
Goat, fat0.4
Goat, meat0.15
Goat, meat byproducts6
Grain, aspirated fractions25
Hog, fat0.4
Hog, meat0.15
Hog, meat byproducts6
Horse, fat0.4
Horse, meat0.15
Horse, meat byproducts6
Milk0.15
Poultry, fat0.15
Poultry, meat0.15
Poultry, meat byproducts0.6
Rapeseed, subgroup 20A0.4
Sheep, fat0.4
Sheep, meat0.15
Sheep, meat byproducts6
Soybean2
Soybean, hulls10

(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). Compliance with the tolerance levels specified in table 3 to paragraph (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.

Table 3 to Paragraph (c)

Commodity Parts per
million
Grass, forage0.15
Grass, hay0.2

(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), as a result of the application of glufosinate to crops listed in paragraph (a) of this section. Compliance with the tolerance levels specified in table 4 to paragraph (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.

Table 4 to Paragraph (d)(1)

Commodity Parts per
million
Barley, hay0.40
Barley, straw0.40
Buckwheat, fodder0.40
Buckwheat, forage0.40
Oat, forage0.40
Oat, hay0.40
Oat, straw0.40
Rye, forage0.40
Rye, straw0.40
Teosinte0.40
Triticale0.40
Wheat, forage0.40
Wheat, hay0.40
Wheat, straw0.40

(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), as a result of the application of glufosinate-P or glufosinate-P-ammonium to crops listed in paragraph (a)(2) of this section. Compliance with the tolerance levels specified in table 5 to paragraph (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.”

Table 5 to Paragraph (d)(2)

Commodity Parts per
million
Barley, hay0.4
Barley, straw0.4
Buckwheat, fodder0.4
Buckwheat, forage0.4
Oat, forage0.4
Oat, hay0.4
Oat, straw0.4
Rye, forage0.4
Rye, straw0.4
Teosinte0.4
Triticale0.4
Wheat, forage0.4
Wheat, hay0.4
Wheat, straw0.4
[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]
authority: 21 U.S.C. 321(q), 346a and 371
source: 36 FR 22540, Nov. 25, 1971, unless otherwise noted.
cite as: 40 CFR 180.473
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