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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 (FAQ) documents on regulatory topics. Please review our FAQ documents here:

Additionally PHMSA has Hazardous Materials FAQs based on letters of interpretation on the following topics:

This section of the website provides the ability to find regulations information including regulations parts, content of sections, and interpretations for regulations sections. Below is a list of parts, identified by the part number and subject. 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.

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.

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
16-0174 44 Blue Productions LLC Mark Hamaguchi View
21-0010 Kansas Highway Patrol Nicholas Wright View
PI-19-0001 Town of Hopkinton Mr. J. Raymond Miyares View
00-0001 RPS, Inc. Mr. Jerry W. Freeman View
00-0002 SJC Compliance Education Mr. Stephen Cansler View
00-0004 It's A Gas, LLC Propane Cylinders Mr. Jeff Atkinson View
00-0006 Shipmate, Inc. Mr. Steven Charles Hunt View
00-0007 Shipmate, Inc. Mr. Steven Charles Hunt View
00-0009 Shell Chemical Company Mr. William Reinike View
00-0010 Sumter Transport Mr. Scott W. Rumph View
00-0013 Mr. Kurt Martin View
00-0014 Waste Technology Services Inc. Mr. David J. Passuite View
00-0015 Bureau of Alcohol, Tobacco and Firearms Mr. Paul J. Vida View
00-0016 Materials Association, Inc. Mr. John V. Currie View
00-0017 Mediterranean Shipping Company (USA) Inc. Mr. H. Dever Mahoney Jr View
00-0021 Mr. Theron R. Brayman View
00-0022 SC Johnson Wax Professional Ms. Laura Bridges View
00-0023 Cosco North America, Inc. John E. La Gorce View
00-0024 Western Poly Drums, Inc. Mr. Floyd A. Whitney View
00-0025 Monsanto Company Mr. William J. Briner View
00-0026 Mr. Richard L. Walters View
00-0027 Regulatory Center of Excellence Mr. William 0. Gramer View
00-0028 Trans World Airlines, Inc. Mr. Les Adolph View
00-0029 Federal Aviation Administration Mr. Rick Reimer View
00-0030 ECHO Incorporated Mr. Dominic A. Palombo View
00-0034 EAC Corporation Mr. Keith B. Berkholtz View
00-0035 Transportation Safety Compliance Service Mr. Darwin D. Garvin View
00-0036 Idaho State Police Trooper William I. Reese View
00-0037 North American Group Ms. Cassie Mayrand-Burney View
00-0038 ELG Haniel Trading Corporation Mr. Eric G. Poole View
00-0041 Household Hazardous Waste Management Program Mr. Robert Fiederlein View
00-0042 Public Works Department Mr. Dave Vail View
00-0044 Photographic Solutions, Inc. Mr. David M. Stone View
00-0045 National Packaging Services, Inc. Mr. Robert Strasser View
00-0046 Taylor-Wharton Mr. Glenn Curtis View
00-0047 Trojan Battery Company Ms. Diane H. Kennedy, R.E.H.S. View
00-0048 Mediterranean Shipping Company Mr. Marvin Pontiff View
00-0049 Honeywell Mr Jeffrey A. Leese View
00-0050 Paramount Tank, Inc. Mr. Howard Grey View
00-0053 Office of Motor Carrier Safety Mr. Robert J. Brown, Jr. View
00-0054 Texas Department of Public Safety Trooper Rocky Stone View
00-0055 Lead Industries Association, Inc. Mr. Jeffrey T. Miller View
00-0056 Textron Systems Corporation Mr. William Porter View
00-0057 Gulf Trading (Alabama), Inc Mr. Mark Walker View
00-0058 Considar, Inc. Ms. Noreen McDonald View
00-0060 American Suzuki Motor Corporation Mr. Werner Dittmer View
00-0063 US Airways Ms. Zoe Abdul View
00-0064 Mr. Tom Kennedy Independent Container Line Ltd. View
00-0065 Horning's Incorporated Ms. Kathy M. Koppe View
00-0066 Allied Universal Corp. Ms. Robin J. Eddy View

E.g., 02/09/2021
E.g., 02/09/2021
Part/Section Subject
105.40 Designated agents for non-residents
105.5 Definitions
106.100 Required information for a petition for rulemaking
106.105 PHMSA response to a petition for rulemaking
106.130 PHMSA response to an appeal
106.95 Requesting a change to the regulations
107.1 Definitions
107.105 Application for special permit
107.107 Application for party status
107.109 Application for renewal
107.201 Purpose and scope
107.202 Standards for determining preemption
107.203 Application
107.205 Notice
107.211 Petition for reconsideration
107.305 Investigations
107.307 General
107.329 Maximum penalties
107.333 Criminal penalties generally
107.401 Purpose and scope
107.402 Application for designation as a certification agency
107.501 Scope
107.502 General registration requirements
107.504 Period of registration, updates, and record retention
107.601 Applicability
107.606 Exceptions
107.608 General registration requirements
107.705 Registrations, reports, and applications for approval
107.709 Processing of an application for approval, including an application for renewal or modification
107.713 Approval modification, suspension or termination
107.801 Purpose and scope
107.805 Approval of cylinder and pressure receptacle requalifiers
130.5 Definitions
171.1 Applicability of Hazardous Materials Regulations (HMR) to persons and functions
171.10 Units of measure
171.12 North American Shipments
171.15 Immediate notice of certain hazardous materials incidents
171.16 Detailed hazardous materials incident reports
171.2 General requirements
171.22 Authorization and conditions for the use of international standards and regulations
171.23 Requirements for specific materials and packagings transported under the ICAO Technical Instructions, IMDG Code, Transport Canada TDG Regulations, or the IAEA Regulations
171.24 Additional requirements for the use of the ICAO Technical Instructions
171.25 Additional requirements for the use of the IMDG Code
171.25 Additional requirements for the use of the IMDG Code
171.26 Additional requirements for the use of the IAEA Regulations
171.3 Hazardous waste
171.4 Marine pollutants
171.6 Control numbers under the Paperwork Reduction Act