NORTHERN NATURAL GAS CO — Warning Letter

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Pipeline and Hazardous Materials Safety AdministrationOfficial agency material

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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.

This material provides agency context. It does not replace binding regulatory text, and its legal effect depends on the underlying authority and facts.