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Below are the available interpretations and guidance for the given section. To return to the list of parts, use the Parts link above. If you do not see any guidance or interpretation information below, that means there is none available for the given part/section. Return to the search page to browse additional regulations sections.

PHMSA has published several Frequently Asked Questions (FAQ) documents on regulatory topics. Please review our FAQ documents below:

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 regulations text of the section can be found on the eCFR website. To view the regulations text, use the link below. For assistance, please send an email to

View part 107 on the ECFR website

Interpretation Responses

Ref ID Date Company Name Individual Name Response Document
22-0122 David Fletcher View
20-0041 Tatonduk Outfitters Limited, dba Everts Air Cargo Robert Ragar View
18-0114 Began Tank Truck Mark Smith View
17-0101 Preco, Inc. Brian Wiedow View
17-0136 HSSE Consulting Services Inc./NATC Inc. Len Comtois View
16-0198 C&J Energy Services Ltd. Mr. George Doggett View

Regulation Sections

Section Subject
107.1 Definitions
107.101 Purpose and scope
107.105 Application for special permit
107.107 Application for party status
107.109 Application for renewal
107.111 Withdrawal
107.113 Application processing and evaluation
107.117 Emergency processing
107.121 Modification, suspension or termination of special permit or grant of party status
107.123 Reconsideration
107.125 Appeal
107.127 Availability of documents for public inspection
107.201 Purpose and scope
107.202 Standards for determining preemption
107.203 Application
107.205 Notice
107.207 Processing
107.209 Determination
107.211 Petition for reconsideration
107.213 Judicial review
107.215 Application
107.217 Notice
107.219 Processing
107.221 Determination
107.223 Petition for reconsideration
107.227 Judicial review
107.301 Delegated authority for enforcement
107.303 Purpose and scope
107.305 Investigations
107.307 General
107.309 Warning letters
107.310 Ticketing
107.311 Notice of probable violation
107.313 Reply
107.315 Admission of violations
107.317 Informal response
107.319 Request for a hearing
107.321 Hearing
107.323 ALJ's decision
107.325 Appeals
107.327 Compromise and settlement
107.329 Maximum penalties
107.331 Assessment considerations
107.333 Criminal penalties generally
107.335 Referral for prosecution
107.336 Limitation on fines and penalties
107.337 Injunctions generally
107.338 Prohibition of hazardous materials operations
107.339 Imminent hazards
107.401 Purpose and scope
107.402 Application for designation as a certification agency
107.403 Designation of certification agencies
107.404 Conditions of designation
107.501 Scope
107.502 General registration requirements
107.503 Registration statement
107.504 Period of registration, updates, and record retention
107.601 Applicability
107.606 Exceptions
107.608 General registration requirements
107.612 Amount of fee
107.616 Payment procedures
107.62 Recordkeeping requirements
107.701 Purpose and scope
107.705 Registrations, reports, and applications for approval
107.709 Processing of an application for approval, including an application for renewal or modification
107.711 Withdrawal
107.713 Approval modification, suspension or termination
107.715 Reconsideration
107.717 Appeal
107.801 Purpose and scope
107.803 Approval of an independent inspection agency (IIA)
107.805 Approval of cylinder and pressure receptacle requalifiers
107.807 Approval of non-domestic chemical analyses and tests
107.809 Conditions of UN pressure receptacle approvals