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Section §171.4: Marine pollutants

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 section 171.4 on the ECFR website

Interpretation Responses

Ref ID Date Company Name Individual Name Response Document
23-0086 Azelis Ms. Cindy Murphy View
22-0017 Old Bridge Chemicals, Madison Industries, Inc. Sandy Volk View
21-0091 Entegris James V. McManus View
19-0104 Public Utilities Commission of Ohio Tom Forbes View
19-0065 Freeman Manufacturing & Supply Company Ben Inman View
18-0077 ICL-IP America, Inc Levi Howell View
18-0056 Outsource Logistics, LLC View
16-0092 Mr. Richard Lloyd View
14-0022 LANXESS Corporation Ms. Cyndi Fink View
12-0169 LANXESS Corporation Ms. Cyndi Fink View
01-0084 Crompton Corporation Mr. Donald Hodder View
13-0097 BASF Corporation Mr. Joseph Matousek View
15-0053 Mr. Kevin Skerrett View
13-0231 Universal Well Services, Inc Mr. Tom Cloud and Ms. Janell Agnew View
04-0074 Briggs & Stratton Mr. John Mourand View
16-0054 Infotrac, Inc. Mr. Jason Kob View
98-0280 Exxon Company, U.S.A. Mr. Robert A. Cashill View
01-0288 Clariant Corporation Mr. Robert F. Rau View