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Section §173.443: Contamination control

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 173.443 on the ECFR website

Interpretation Responses

Ref ID Date Company Name Individual Name Response Document
22-0014 I.C.E. Service Group & SPS Strategic Packaging Systems Mr. Kurt Colborn View
08-0013 Idaho State Police Mr. Thomas Wright View
00-0304 United States Enrichment Corporation Dr. M. E. Darrough View
13-0101 Regulatory Resources, Inc. Mr. W.A. Winters View
99-0119 Department of the Army Mr. Vernon E. Vondera View
10-0174 Integrity Inspection Services Mr. James Jagemann View
16-0016 U.S. Customs and Border Protection Mr. Jason Hart View
02-0116 Science Applications International Corporation James R. Price View
11-0163 International Radiation Safety Consulting, Inc. Mr. Sean Chapel View
05-0094 MHF Logistical Solutions Mr. Kurt Colborn View
06-0002 MHF Logistical Solutions Mr. Kurt Colborn View
06-0002 MHF Logistical Solutions Mr. Kurt Colborn View
06-0153 Air Force Medical Operations Agency Mr. Mark C. Wrobel  View
09-0206 State of Utah Department of Environmental Quality Mr. Dane Finerfrock View
04-0047 Northrop Grumman Electronic Mr. Steven McKew View