Pipeline and Hazardous Materials Safety Administration, Department of Transportation
PHMSA
Part of Department of Transportation
Content Hash:
ef7f7b9e54c4dbf485c068b15608942b
MD5 checksum of all regulatory content as of Oct 15, 2025
Regulatory Word Count Over Time
Total words across all chapters managed by this agency
Earliest:
657,810 words
(Jan 01, 2017)
Latest:
5,520,912 words
(Oct 15, 2025)
Change:
+4,863,102
(739.3%)
CFR Chapters
Title 49, Chapter I
CHAPTER I - PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION