---
kind: "section"
citation: "40 C.F.R. § 180.1025"
title: "40"
number: "180.1025"
heading: "Xylene; exemption from the requirement of a tolerance."
url: "https://uscodex.org/cfr/40/180.1025"
---

# §180.1025. Xylene; exemption from the requirement of a tolerance.


Xylene is exempted from the requirement of a tolerance when used as an aquatic herbicide applied to irrigation conveyance systems in accordance with the following conditions:

- (a) It is to be used only in programs of the Bureau of Reclamation, U.S. Department of Interior, and cooperating water user organizations.
- (b) **It is to be applied as an emulsion at an initial concentration not to exceed 750 parts per million.**
- (c) It is not to be applied when there is any likelihood that the irrigation water will be used as a source of raw water for a potable water system or where return flows of such treated irrigation water into receiving rivers and streams would contain residues of xylene in excess of 10 parts per million.
- (d) Xylene to be used as an aquatic herbicide shall meet the requirement limiting the presence of a polynuclear aromatic hydrocarbons as listed in [21 CFR 172.250](/cfr/21/172.250.md).

## Notes

### Amendments

[38 FR 16352, June 22, 1973, as amended at 50 FR 2980, Jan. 3, 1985]

### Authority

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

### Source

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

### Amendments

[38 FR 16352, June 22, 1973, as amended at 50 FR 2980, Jan. 3, 1985]