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U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation

49 CFR Parts 100-199

PHMSA has published several Frequently Asked Questions (FAQs) documents on programmatic topics. Please review these documents here at:

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

OHMS: 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).

OPS: 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: 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.

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

Search the eCFR

Ref ID: Date Company Name Individual Name Response Document
PI-96-019 Koch Industries, Inc. Cliff Donnelly View
PI-96-020 Tennessee Regulatory Authority Glynn Blanton View
PI-96-022 Division Of Public Utilities and Carriers James J. Malachowski View
PI-96-024 Alyeska Pipeline Service Company Angi L. Smith View
PI-96-025 Northern Indiana Fuel and Light Company, Inc. Pam Good View
PI-96-026 California Department of Forestry and Fire Protection Nancy Wolfe View
PI-97-001 National Counseling Resource Duncan McPherson View
PI-97-002 Granite State Transmission, Inc Thomas F. Brosnan View
PI-97-003 View
PI-97-004 View
PI-97-005 View
PI-97-006 Memo: Internal View
PI-97-007 Office of Pipeline Safety Edward J. Ondak View
PI-97-008 South Dakota Public Utilities Commission Martin C. Bettmann View
PI-97-0100 Mr. Chuck Hudson Arizona Corporation Commission View
PI-97-0101 Shell Western E&P Inc. Mr. R. J Redweik View
PI-97-0102 BP Oil Company Mr. Larry Abraham View
PI-97-0103 Craig Company Mr. Paul V. Craig View
PI-97-100 Shell Western E&P Inc. Mr. R.J. Redweik View
PI-98-001 Tennessee Regulatory Authority Glynn Blanton View
PI-98-002 James S. Stites View
PI-98-003 The Public Utilities Commission of Ohio Edward M. Steele View
PI-98-004 UMAC, Inc. John B. McGowan, Jr. View
PI-98-005 Williams Field Services Chris Mason View
PI-98-006 Shell Oil Products Company Gweneyette Broussard View
PI-98-008 Sierra Pacific Power Company Michael G. Rodriguez View
PI-98-009 West Virginia Public Service Commission David A. Hippchen View
PI-98-010 BP Oil Company L.S. Abraham View
PI-98-0100 Shell Oil Products Company Ms. Gweneyette Broussard View
PI-98-0101 U.S. Department of Transportation Richard Sanders View
PI-98-0102 West Virginia Public Service Commission Mr. David A. Hippchen View
PI-98-0103 All American Pipeline Company Mr. Jordan R. Janak View
PI-98-011 Tennessee Regulatory Authority Glynn Blanton View
PI-99-003 Montgomery & Andrews Brett Olsen View
PI-99-0100 California Public Utilities Commission Mr. Mahendra Jhala View
PI-99-0101 Health, Safety, Environmental Quality & Regulatory Affairs Baker Petrolite Corporation Mr. Brian Friedman View
PI-99-0103 Chief, Gas Pipeline Safety Division Mr. Glynn Blanton View
PI-99-0104 Illinois Power Company Ms. Amy L. Hammond View
PI-99-0105 City of Rolling Meadows Mr. Rodney A. Blane View
PI-99-0106 Colonial Pipeline Company Mr. Stephen E. Gilliam View
PI-99-0107 Arizona Corporation Commission Mr. Terry Fronterhouse View

E.g., 02/09/2021
E.g., 02/09/2021

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