# Warning letters.

**Citation:** 49 CFR 107.309  
**Type / status:** regulation / current  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** 2026-08-18  
**Published:** Not stated

(a) The Associate Administrator may issue a warning letter to any person whom the Associate Administrator believes to have committed a probable violation of the Federal hazardous material transportation law, the Federal Water Pollution Control Act, or any provision of this subchapter, subchapter B o

## Document text

(a) The Associate Administrator may issue a warning letter to any person whom the Associate Administrator believes to have committed a probable violation of the Federal hazardous material transportation law, the Federal Water Pollution Control Act, or any provision of this subchapter, subchapter B of this chapter, subchapter C of this chapter, or any special permit issued thereunder.

(b) A warning letter issued under this section includes:

(1) A statement of the facts upon which the Associate Administrator bases its determination that the person has committed a probable violation;

(2) A statement that the recurrence of the probable violations cited may subject the person to enforcement action; and

(3) An opportunity to respond to the warning letter by submitting pertinent information or explanations concerning the probable violations cited therein.

[Amdt. 107-11, 48 FR 2651, Jan. 20, 1983, as amended by Amdt. 107-15, 51 FR 34986, Oct. 1, 1986; Amdt. 107-24, 56 FR 8621, Feb. 28, 1991; Amdt. 107-32, 59 FR 49131, Sept. 26, 1994; Amdt. 107-36, 61 FR 7183, Feb. 26, 1996; 66 FR 45377, Aug. 28, 2001; 84 FR 6947, Feb. 28, 2019]

## Provenance

- Official: Yes
- Source: <https://www.ecfr.gov/on/2026-08-18/title-49/section-107.309>
- Source ID: `ecfr`
- SHA-256: `6dc528ee4b669f309581d27d9d2e91f053c3f6a27e8c642cbd8798b9e96b3f6f`
- Retrieved: 2026-08-20T05:45:49.310Z
- Exported: 2026-08-23T09:22:09.304Z
- Document slug: `49-cfr-107-309`

### Source metadata

```json
{
  "cfrTitle": 49,
  "part": "107",
  "section": "107.309",
  "subpart": "Subpart D—Enforcement",
  "corpusVersion": "2026-08-18",
  "jurisdiction": "US"
}
```