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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 191 on the ECFR website

Regulation Sections

Section Subject
191.1 Scope
191.3 Definitions
191.5 Immediate notice of certain incidents
191.7 Report submission requirements
191.9 Distribution system: Incident report
191.11 Distribution system: Annual report
191.12 Distribution Systems: Mechanical Fitting Failure Reports
191.13 Distribution systems reporting transmission pipelines; transmission or gathering systems reporting distribution pipelines
191.15 Transmission systems; gathering systems; liquefied natural gas facilities; and underground natural gas storage facilities: Incident report
191.17 Transmission systems; gathering systems; liquefied natural gas facilities; and underground natural gas storage facilities: Annual report
191.21 OMB control number assigned to information collection
191.22 National Registry of Pipeline and LNG operators
191.23 Reporting safety-related conditions
191.25 Filing safety-related condition reports
191.29 National Pipeline Mapping System
191.27 Filing offshore pipeline condition reports