---
kind: "section"
citation: "40 C.F.R. § 180.209"
title: "40"
number: "180.209"
heading: "Terbacil; tolerances for residues."
url: "https://uscodex.org/cfr/40/180.209"
---

# §180.209. Terbacil; tolerances for residues.

- (a) **General.** Tolerances are established for residues of the herbicide terbacil, including its metabolites and degradates, in or on the commodities in table 1 to this [paragraph (a)](#a). Compliance with the tolerance levels specified in table 1 to this [paragraph (a)](#a) is to be determined by measuring only the sum of terbacil (5-chloro-3-(1,1-dimethylethyl)-6-methyl-2,4(1H,3H)-pyrimidinedione) and its metabolites 3-tert-butyl-5-chloro-6-hydroxymethyluracil, 6-chloro-2,3-dihydro-7-hydroxymethyl 3,3-dimethyl-5H-oxazolo(3,2-a) pyrimidin-5-one, and 6-chloro-2,3-dihydro-3,3,7-trimethyl-5H-oxazolo(3,2-a) pyrimidin-5-one, calculated as the stoichiometric equivalent of terbacil, in or on the commodity.
- (b) **Section 18 emergency exemptions.** [Reserved]
- (c) **Tolerances with regional registrations.** [Reserved]
- (d) **Indirect or inadvertent residues.** [Reserved]

## Notes

### Amendments

[71 FR 30818, May 31, 2006, as amended at 91 FR 8104, Feb. 20, 2026]

### Authority

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

### Source

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

### Amendments

[71 FR 30818, May 31, 2006, as amended at 91 FR 8104, Feb. 20, 2026]