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Warning Letter Cases


This report shows all Warning Letters issued to operators since 2002. The tables show the date the Warning Letter was issued, the operator name, the PHMSA Region issuing the letter, and the PHMSA case number. When PHMSA inspections or other oversight activities reveal lesser violations or program deficiencies of an operator, the agency may issue Warning Letters notifying an operator that a probable violation of PHMSA's regulations has occurred and directing it to correct the violation or be subject to further enforcement action. PHMSA then follows up on these items during subsequent inspections. Warning Letters are described in 49 CFR 190.205. Because Warning Letters do not result in actual findings of violations or penalties, the cases are considered "closed" upon issuance.

Warning Letters Issued: 2002–2024(1)


  1. PHMSA Work Management System as of 07/01/2024.

Information provided on this website is intended to enhance public understanding of PHMSA's enforcement program.

Aggregate and company-specific statistical information reflecting PHMSA's enforcement actions is provided beginning with 2002. Key documents associated with new administrative enforcement cases are provided beginning with 2007. Agency orders issued since 2002 are also provided.

The search feature may not retrieve every document associated with each individual enforcement action. Enforcement data is updated monthly as additional cases are initiated and other cases are resolved. Historical totals will change over time to reflect changes in case status.

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U.S. Department of Transportation
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