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49 CFR Parts 100 - 199

PHMSA has published several Frequently Asked Questions (FAQ) documents on regulatory topics. Please review our FAQ documents here:

This section of the website provides the ability to find interpretations related to pipeline and hazardous materials safety regulations. You can also find information including regulations parts. Below is a list of parts, identified by the part number and subject. You can view interpretations related to the part number by selecting the hyperlink on the right. To browse regulation sections by part, click on the subject link below. You will be taken to the eCFR website to view sections for a part.

You can also browse PHMSA interpretations using the browser to the left. Click the glass icon to search by keyword, Orders of the Chief Counsel, regulation part/section or reference ID. You can also use the filter icon to view a list of interpretations related specifically to pipeline safety or hazardous materials safety. The "<" and ">" icons will collapse and expand the interpretations browser.

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