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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 190 on the ECFR website

Regulation Sections

Section Subject
190.1 Purpose and scope
190.3 Definitions
190.5 Service
190.7 Subpoenas; witness fees
190.9 Petitions for finding or approval
190.11 Availability of informal guidance and interpretive assistance
190.201 Purpose and scope
190.203 Inspections and investigations
190.205 Warnings
190.206 Amendment of plans or procedures
190.207 Notice of probable violation
190.208 Response options
190.209 Case file
190.21 Separation of functions
190.211 Hearing
190.212 Presiding official, powers, and duties
190.213 Final order
190.217 Compliance orders generally
190.219 Consent order
190.221 Civil penalties generally
190.223 Maximum penalties
190.225 Assessment considerations
190.227 Payment of penalty
190.233 Corrective action orders
190.235 Civil actions generally
190.236 Emergency orders
190.237 Petitions for review
190.239 Safety orders
190.241 Finality
190.243 Petitions for reconsideration
190.291 Criminal penalties generally
190.293 Referral for prosecution
190.301 Scope
190.303 Delegations
190.305 Regulatory dockets
190.307 Records
190.309 Where to file petitions
190.311 General
190.313 Initiation of rulemaking
190.315 Contents of notices of proposed rulemaking
190.317 Participation by interested persons
190.319 Petitions for extension of time to comment
190.321 Contents of written comments
190.323 Consideration of comments received
190.325 Additional rulemaking proceedings
190.327 Hearings
190.329 Adoption of final rules
190.331 Petitions for rulemaking
190.333 Processing of petition
190.335 Petitions for reconsideration
190.337 Proceedings on petitions for reconsideration
190.338 Appeals
190.339 Direct final rulemaking
190.341 Special permits
190.343 Information made available to the public and request for protection of confidential commercial information
190.401 Scope
190.403 Applicability
190.405 Notification
190.407 Master Agreement
190.409 Fee structure
190.411 Procedures for billing and payment of fee