---
kind: "section"
citation: "21 C.F.R. § 556.670"
title: "21"
number: "556.670"
heading: "Sulfamethazine."
url: "https://uscodex.org/cfr/21/556.670"
---

# §556.670. Sulfamethazine.

- (a) [Reserved]
- (b) **Tolerances.** The tolerances for sulfamethazine are:
  - (1) **Cattle.** Edible tissues (excluding milk): 0.1 ppm.
  - (2) **Chickens and turkeys.** Edible tissues (excluding eggs): 0.1 ppm.
  - (3) **Swine.** Edible tissues: 0.1 ppm.
- (c) **Related conditions of use.** See §§ [520.445](/cfr/21/520.445.md), [520.2218](/cfr/21/520.2218.md), [520.2260a](/cfr/21/520.2260a.md), [520.2260b](/cfr/21/520.2260b.md), [520.2260c](/cfr/21/520.2260c.md), [520.2261a](/cfr/21/520.2261a.md), [520.2261b](/cfr/21/520.2261b.md), [522.2260](/cfr/21/522.2260.md), [558.140](/cfr/21/558.140.md), and [558.630](/cfr/21/558.630.md) of this chapter.

## Notes

### Amendments

[84 FR 32993, July 11, 2019, as amended at 85 FR 18121, Apr. 1, 2020; 86 FR 13188, Mar. 8, 2021]

### Authority

Authority: 21 U.S.C. 342, 360b, 371.

### Source

Source: 84 FR 32993, July 11, 2019, unless otherwise noted.

### Amendments

[84 FR 32993, July 11, 2019, as amended at 85 FR 18121, Apr. 1, 2020; 86 FR 13188, Mar. 8, 2021]