Letters of Interpretation

PHMSA has published several Frequently Asked Questions (FAQs) documents on programmatic topics. Please review these documents here at: https://www.phmsa.dot.gov/about-phmsa/phmsa-faqs.

Additionally, Office of Hazardous Materials Safety has published Hazardous Materials FAQs based on letters of interpretation on the following topics:

Office of Hazardous Materials Safety: For questions about transporting hazardous materials, needing clarifications of the Hazardous Materials Regulations (HMR; 49 CFR Parts 171-180), or requesting a formal letter of interpretation, please go to the Hazardous Materials Information Center (HMIC) page for contact information (phone and email address). Pending interpretation letters that are under review by the Office of Hazardous Materials Safety can be found at Pending Hazardous Materials (Hazmat) Interpretations.

Office of Pipeline Safety: A written regulatory interpretation, response to a question, or an opinion concerning a pipeline safety issue may be obtained by submitting a written request to the Office of Pipeline Safety (PHP–30), PHMSA, U.S. Department of Transportation, 1200 New Jersey Avenue SE., Washington, DC 20590–0001 or at the email address: pipeline_interp_submittal@dot.gov. In addition to email address, the requestor must include his or her return address and should also include a daytime telephone number. Requests should be submitted at least 120 days before the time the requestor needs a response. Note: electronic submission is provided as alternative to the 49 CFR Part 190.11(b) mail-in requirement.

Interpretation letters under review are available at the Office of Pipeline Safety’s Interpretation Review page. To submit comments on an interpretation under review, proceed to the Interpretation Review page, locate the interpretation to comment on, and click the appropriate link to submit a comment on the corresponding interpretation. Comment submissions will be accepted for 30-days after the interpretation letter is posted.

This section of the website below provides the ability to find regulations information including regulations parts, content of sections, and interpretations for regulations sections. A list of parts, identified by the part number and subject is also provided. To browse sections by part, click on the subject link below. You will be taken to the eCFR website to view sections for a part.

The eCFR is also searchable by keyword and other available options on the eCFR website. To search and browse regulations using the eCFR website, use the link below. For assistance, please send an email to PHMSA.Webmaster@dot.gov.

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Interpretations Reference #

Keyword Search Tip: Use quotation marks to search for commonly used phrases, such as “gas transmission” or “cargo tank motor vehicle.”

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Interpretations Reference #

Publish Date From E.g., 02/09/2021

Publish Date To E.g., 02/09/2021

Only Chief Counsel Responses

Ref ID:	Date Sort ascending	Company Name	Individual Name	Response Document
06-0237	11/07/2006		Ms. Dorothea A. Welk	View
06-0210	11/07/2006	Dufour Petroleum LP	Mr. Don Ladner	View
06-0214	11/07/2006	Industrial Health & Safety Consultants	Ms. Denese Deeds	View
06-0232	11/03/2006	Premier Trading Group	Mr. Dub Phillips	View
06-0201	11/02/2006	Oak Ridge National Laboratory	Mr. Mark B. Hawk	View
06-0212	10/26/2006	Ameriflight, Inc.	Mr. Matt Payne	View
06-0229	10/26/2006	National Headquarters	Mr. Michael I. Gorman	View
06-0204	10/26/2006		Mr. Jim Pitts	View
06-0230	10/25/2006	Wiley Rein & Fielding LLP	Mr. George A. Kerchner	View
06-0141	10/25/2006	LG Chem/Mobile Energy Company	Hyeong " Jin Kim, Ph.D.	View
06-0209	10/18/2006	Prometheus International, Inc.	Mr. Keith K. Park	View
06-0218	10/17/2006	Holmes Freigth Lines, Inc.	Mr. Mohamed R. Ali	View
06-0194	10/13/2006	North American Automotive Hazmat Action Committee	Mr. Dave Madsen	View
06-0196	10/13/2006	Quarles & Brady LLP	Mr. Lars E. Guibrandsen	View
06-0208	10/13/2006	ETCetera International, Inc	Mr. Jim Anderson	View
06-0100	10/13/2006	Department of Energy	Mr. James M. Shuler	View
06-0185	10/12/2006	Ehrhart Propane Gas	Mr. Thomas G. Overbaugh	View
06-0180	10/12/2006	HMT Associates, L.L.C	Mr. E.A. Altemos	View
06-0166	10/10/2006	American Pyrotechnics Association	Mr. Gregg Smith	View
06-0160	10/05/2006	Supervac 2000	Ms. Nathalie Doyon	View
06-0190	10/03/2006	RWE NUKEM Corporation	Mr. Stan Hodges	View
06-0121	10/03/2006	Hydrol Chemical Co., Inc.	Mr. Richard W. Hoffman, Jr.	View
06-0216	10/02/2006	Wiley Rein and Feuding LLP	Mr. George A. Kerchner	View
06-0189	09/29/2006	Nukem Corporation	Mr. Stan Hodges	View
06-0200	09/27/2006		Mr. Robert D. Howerton, Ph.D.	View
06-0192	09/20/2006	Austin Powder Company	Mr. Larry J. "Scooter" King	View
05-0278	09/20/2006	Regulatory Resources, Inc.	Mr. Bruce McLees	View
06-0173	09/18/2006	Schlumberger, Ltd.	Mr. Paul Lezak	View
06-0155	09/15/2006	Transportation Systems Solutions	Mr. Peter Olsen	View
06-0129	09/14/2006	C.L. Smith Company	Mr. Lonny Jaycox	View
06-0177	09/13/2006	Duplainville Transport, Inc.	Safety Specialist	View
06-0168	09/12/2006	Oak Ridge National Laboratory	Mr. Herb Debban	View
06-0174	09/11/2006	Alliant Techsystems Inc. (ATK)	Mr. Christopher Widman	View
06-0182	09/11/2006	Solvay Chemicals	Mr. Marc Feldman	View
06-0159	09/11/2006	Matthews Associates, Incorporated	Mr. David Hopkins	View
06-0137	09/11/2006	Department of the Army	Ms. Lauren Oleksyk	View
06-0188	09/08/2006	Hazardous Materials Training Compliance	Mr. Philip C. Rieke	View
06-0183	09/08/2006	Devon Energy Corporation	Mr. Joe Huber	View
06-0175	09/08/2006	Hazardous Material Distribution Consultant	Mr. Randolph Martin	View
06-0184	09/06/2006	Musket Corporation	Mr. Doug Lumry	View
06-0153	09/05/2006	Air Force Medical Operations Agency	Mr. Mark C. Wrobel	View
06-0187	08/29/2006	Miller and Company	Mr. Ed Koziorowski	View
06-0172	08/25/2006	Texas Railroad Commission		View
06-0169	08/24/2006	Transportation Development Group	Mr. Jim Powell	View
05-0204	08/24/2006	gh Package & Product Testing	Mr. H. Perry Hock	View
06-0165	08/24/2006		Mr. Richard B. Loden	View
06-0078	08/24/2006	Air Products and Chemicals, Inc.	Mr. Don Silfies	View
06-0117	08/24/2006	Manager of Technical Services	Mr. Lon D. Santis	View
06-0181	08/22/2006	Laboratory Medicine Consultants	Ms. Jane Swerdlow	View
06-0161	08/22/2006	Nazdar Limited	Ms. Linda M. Bartram	View

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Letters of Interpretation