You are using an unsupported browser. This web site is designed for the current versions of Microsoft Edge, Google Chrome, Mozilla Firefox, or Safari.
The Office of the Federal Register publishes documents on behalf of Federal agencies but does not have any authority over their programs. We recommend you directly contact the agency associated with the content in question.
If you have comments or suggestions on how to improve the www.ecfr.gov website or have questions about using www.ecfr.gov, please choose the 'Website Feedback' button below.
If you would like to comment on the current content, please use the 'Content Feedback' button below for instructions on contacting the issuing agency
Enhanced content is provided to the user to provide additional context.
This content is from the eCFR and is authoritative but unofficial.
Navigate by entering citations or phrases (eg: 1 CFR 1.1 49 CFR 172.101 Organization and Purpose 1/1.1 Regulation Y FAR).
Choosing an item from citations and headings will bring you directly to the content. Choosing an item from full text search results will bring you to those results. Pressing enter in the search box will also bring you to search results.
Background and more details are available in the Search & Navigation guide.
The in-page Table of Contents is available only when multiple sections are being viewed.
Use the navigation links in the gray bar above to view the table of contents that this content belongs to.
21 U.S.C. 321(q), 346a and 371.
36 FR 22540, Nov. 25, 1971, unless otherwise noted.
This content is from the eCFR and may include recent changes applied to the CFR. The official, published CFR, is updated annually and available below under "Published Edition". You can learn more about the process here.
Subscribe to: 40 CFR 180.500
View the most recent official publication:
These links go to the official, published CFR, which is updated annually. As a result, it may not include the most recent changes applied to the CFR. Learn more.
Information and documentation can be found in our developer resources.
The Code of Federal Regulations (CFR) is the official legal print publication containing the codification of the general and permanent rules published in the Federal Register by the departments and agencies of the Federal Government. The Electronic Code of Federal Regulations (eCFR) is a continuously updated online version of the CFR. It is not an official legal edition of the CFR.
Learn more about the eCFR, its status, and the editorial process.
Nomenclature changes to part 180 appear at 62 FR 66023, Dec. 17, 1997.
Nomenclature changes to subpart C of part 180 appear at 67 FR 41803, June 19, 2002; 67 FR 42393, June 21, 2002; 68 FR 39430, July 1, 2003; 71 FR 74804, Dec. 13, 2006; 72 FR 53137, Sept. 18, 2007; 72 FR 61536, Oct. 31, 2007; 73 FR 60155, Oct. 10, 2008; 75 FR 56014, Sept. 15, 2010; and 76 FR 34885, June 15, 2011.
(a) General. Tolerances are established for residues of the herbicide, imazapyr, including its metabolites and degradates, in or on the commodities in the following table. Compliance with the tolerance levels specified in the following table is to be determined by measuring only the residues of imazapyr [2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3-pyridinecarboxylic acid].
| Commodity | Parts per million |
|---|---|
| Cattle, fat | 0.05 |
| Cattle, kidney | 0.3 |
| Cattle, meat | 0.05 |
| Cattle, meat byproducts, except kidney | 0.05 |
| Corn, field, forage | 0.05 |
| Corn, field, grain | 0.05 |
| Corn, field, stover | 0.05 |
| Fish | 1.0 |
| Goat, fat | 0.05 |
| Goat, kidney | 0.3 |
| Goat, meat | 0.05 |
| Goats, meat byproducts, except kidney | 0.05 |
| Grass, forage | 100 |
| Grass, hay | 30 |
| Horse, fat | 0.05 |
| Horse, kidney | 0.3 |
| Horse, meat | 0.05 |
| Horse, meat byproducts, except kidney | 0.05 |
| Lentil 1 | 0.2 |
| Milk | 0.01 |
| Rapeseed subgroup 20A 1 | 0.05 |
| Rice, bran 1 | 0.15 |
| Rice, grain 1 | 0.06 |
| Sheep, fat | 0.05 |
| Sheep, kidney | 0.3 |
| Sheep, meat | 0.05 |
| Sheep, meat byproducts, except kidney | 0.05 |
| Shellfish | 0.10 |
| Soybean, meal 1 | 4.5 |
| Soybean, seed 1 | 4.0 |
| Sunflower subgroup 20B 1 | 0.05 |
| 1 There are no U.S. registrations as of August 24, 2023. | |
(b) Section 18 emergency exemptions. [Reserved]
(c) Tolerances with regional registrations. [Reserved]
(d) Indirect or inadvertent residues. [Reserved]
[68 FR 55484, Sept. 26, 2003, as amended at 78 FR 66653, Nov. 6, 2013; 79 FR 19487, Apr. 9, 2014; 88 FR 57894, Aug. 24, 2023; 91 FR 9727, Feb. 27, 2026]