40 CFR § 180.331 - 4-(2,4-Dichlorophenoxy) butyric acid; tolerances for residues.

---
identifier: "/us/cfr/t40/s180.331"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 180.331 - 4-(2,4-Dichlorophenoxy) butyric acid; tolerances for residues."
title_number: 40
title_name: "Protection of Environment"
section_number: "180.331"
section_name: "4-(2,4-Dichlorophenoxy) butyric acid; tolerances for residues."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "E"
subchapter_name: "PESTICIDE PROGRAMS"
part_number: "180"
part_name: "TOLERANCES AND EXEMPTIONS FOR PESTICIDE CHEMICAL RESIDUES IN FOOD"
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(q), 346a and 371."
regulatory_source: "36 FR 22540, Nov. 25, 1971, unless otherwise noted."
cfr_part: "180"
---


# 180.331 4-(2,4-Dichlorophenoxy) butyric acid; tolerances for residues.

(a) *General.* Tolerances are established for residues of the herbicide 4-(2,4-dichlorophenoxy) butyric acid (2,4-DB), both free and conjugated, determined as the acid, in or on food commodities, as follows:

| Commodity | Parts per million |
| --- | --- |
| Alfalfa, forage | 0.7 |
| Alfalfa, hay | 2.0 |
| Cattle, meat byproducts | 0.05 |
| Clover, forage | 0.2 |
| Clover, hay | 0.2 |
| Goat, meat byproducts | 0.05 |
| Hog, meat byproducts | 0.05 |
| Horse, meat byproducts | 0.05 |
| Peanut | 0.2 |
| Peppermint, tops | 0.2 |
| Sheep, meat byproducts | 0.05 |
| Soybean, forage | 0.7 |
| Soybean, hay | 2.0 |
| Soybean, seed | 0.5 |
| Spearmint, tops | 0.2 |
| Trefoil, forage | 0.7 |
| Trefoil, hay | 2.0 |

(b) *Section 18 emergency exemptions.* [Reserved]

(c) *Tolerances with regional registrations.* [Reserved]

(d) *Indirect or inadvertent residues.* [Reserved]

[73 FR 54961, Sept. 24, 2008, as amended at 74 FR 46374, Sept. 9, 2009]