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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 199 on the ECFR website

Interpretation Responses

Ref ID Date Company Name Individual Name Response Document
PI-22-0001 I.B.E.W. Local Union 503 Ms. Melissa Kurtz View

Regulation Sections

Section Subject
199.1 Scope
199.2 Applicability
199.3 Definitions
199.5 DOT procedures
199.7 Stand-down waivers
199.9 Preemption of State and local laws
199.100 Purpose
199.101 Anti-drug plan
199.103 Use of persons who fail or refuse a drug test
199.105 Drug tests required
199.107 Drug testing laboratory
199.109 Review of drug testing results
199.113 Employee assistance program
199.115 Contractor employees
199.117 Recordkeeping
199.119 Reporting of anti-drug testing results
199.200 Purpose
199.202 Alcohol misuse plan
199.209 Other requirements imposed by operators
199.211 Requirement for notice
199.215 Alcohol concentration
199.217 On-duty use
199.219 Pre-duty use
199.221 Use following an accident
199.223 Refusal to submit to a required alcohol test
199.225 Alcohol tests required
199.227 Retention of records
199.229 Reporting of alcohol testing results
199.231 Access to facilities and records
199.233 Removal from covered function
199.235 Required evaluation and testing
199.237 Other alcohol-related conduct
199.239 Operator obligation to promulgate a policy on the misuse of alcohol
199.241 Training for supervisors
199.243 Referral, evaluation, and treatment
199.245 Contractor employees