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
06-0192	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
06-0079	08/22/2006	House of Batteries	Mr. Brion Munsey	View
06-0146	08/21/2006	State of New Jersey Department of Environmental Protection	Ms. Robert Gomez	View
06-0149	08/16/2006	Compliant Technologies, Inc.	Mr. David Ellis	View
06-0167	08/14/2006	Cooper Power Systems, Inc.	Mr. Darren Shequen	View
06-0170	08/10/2006	Airgas-SAFECOR	Mr. John Anderson	View
06-0162	08/10/2006	Missouri Gas Energy	Ms. Crystal Callaway	View
06-0074	08/10/2006	Hyundai America Shipping Agency	Mr. Herb Giles	View
06-0152	08/09/2006	Hunton & Williams LLP	Mr. Brooks M. Smith	View
06-0154	08/08/2006	Transportation Systems Solutions	Mr. Peter Olsen	View
06-0158	08/08/2006	Troxler Electronic Laboratories, Inc.	Mr. Steve Browne	View
05-0264	08/08/2006	JFK International Airport	Mr. James LoBello	View
06-0127	08/08/2006	Lockheed Martin Aeronautics Company	Mr. Michael S. Fiddes	View
06-0111	08/08/2006	AmeriPath	Ms. Julie Frail	View
06-0145	08/01/2006	Virginia Polytechnic Institute and State University	Mr. Frank Imperatore	View
06-0034	07/31/2006	National Tank Truck Carriers, Inc.	Mr. Thomas P. Lynch	View
06-0156	07/31/2006	FedEx Express	Mr. Thomas J. Leech, III	View
06-0094	07/31/2006	Quest Diagnostics	Mr. Nicholas Pagerly	View
06-0122	07/31/2006	Minnesota Department of Transportation	Mr. Michael Ritchie	View
06-0143	07/28/2006	Georgia Department of Public Safety	Captain Bruce Bugg	View
06-0147	07/27/2006		Mr. Patrick F. Reilly	View
06-0076	07/27/2006	Regulatory Resources, Inc.	Mr. Wade Winters	View
06-0113	07/27/2006	RBC Dam Rauscher	Mr.. Jay Jensen	View
06-0140	07/18/2006	Minnesota Department of Transportation	Mr. Kevin Kampa	View
06-0139	07/17/2006	Solutions, Inc.	Mr. Victor Anderson	View
06-0138	07/14/2006	Sharp Energy	Mr. Larry R. Miller	View

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Letters of Interpretation