# NORTHERN NATURAL GAS CO — Warning Letter

- **operation:** document
- **citation:** CPF 320053001W
- **title:** NORTHERN NATURAL GAS CO — Warning Letter
- **source type:** enforcement
- **agency:** Pipeline and Hazardous Materials Safety Administration
- **status:** historical
- **official:** true
- **published on:** 2005-03-11
- **effective on:** Not available
- **summary:** CLOSED warning letter citing 193.2017, 193.2521.
- **machine formats:** - **json:** https://regulus.evalyn.ai/document/phmsa-enforcement-320053001w.json
- **markdown:** https://regulus.evalyn.ai/document/phmsa-enforcement-320053001w.md
- **app url:** https://regulus.evalyn.ai/document/phmsa-enforcement-320053001w
- **source url:** https://primis.phmsa.dot.gov/enforcement-data/case/320053001W
**body:**

Warning Letter involving NORTHERN NATURAL GAS CO. PHMSA's enforcement data identifies the cited regulations as 193.2017,  193.2521. The case was opened on 2005-03-11 and is reported as closed as of 2005-03-11. Open the official case record for notices, responses, orders, and the latest status.

PHMSA lists no public case documents for this record.
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