# NORTHWEST PIPELINE LLC — Warning Letter

**Citation:** CPF 520031005W  
**Type / status:** enforcement / historical  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** Not stated  
**Published:** 2003-05-30

CLOSED warning letter citing 192.463(a).

## Document text

Warning Letter involving NORTHWEST PIPELINE LLC. PHMSA's enforcement data identifies the cited regulation as 192.463(a). The case was opened on 2003-05-30 and is reported as closed as of 2003-05-30. Open the official case record for notices, responses, orders, and the latest status.

PHMSA lists no public case documents for this record.

## Provenance

- Official: Yes
- Source: <https://primis.phmsa.dot.gov/enforcement-data/case/520031005W>
- Source ID: `phmsa-enforcement`
- SHA-256: `03b79c8a56c587f6691d05f468bf942016ee7c3fd1b2793867926fd67cb86d28`
- Retrieved: 2026-08-20T04:44:44.458Z
- Exported: 2026-08-25T03:53:14.290Z
- Document slug: `phmsa-enforcement-520031005w`

### Source metadata

```json
{
  "cpf": "520031005W",
  "operator": "NORTHWEST PIPELINE LLC",
  "region": "Western",
  "pipelineType": "GAS INTERSTATE ONSHORE",
  "caseStatus": "CLOSED",
  "citedSections": [
    "192.463(a)"
  ],
  "dataAsOf": "08/04/2026 12PM",
  "caseDataAsOf": "2026-08-04",
  "attachmentCount": 0,
  "attachments": [],
  "extractedAgencyDocumentCount": 0,
  "attachmentPolicy": "Official attachment links are retained. Agency-issued documents may also include a verified local PDF and page-level text representation.",
  "jurisdiction": "US",
  "operatorName": "NORTHWEST PIPELINE LLC"
}
```