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Section §172.203: Additional description requirements

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 172.203 on the ECFR website

Interpretation Responses

Ref ID Date Company Name Individual Name Response Document
23-0008 Leschaco, Inc. Mr. Hien Le View
22-0083 Pilot Chemical Company Megan O’Connor View
22-0008 Public Utilities Commission of Ohio Tom Forbes View
21-0087 National Institute of Standards and Technology Mr. Larry Lucas View
21-0047 Safeway Transportation Richard Elliott View
20-0073 John B. Woodbury View
20-0035 Centers for Disease Control and Prevention (CDC) Lori Bane View
20-0031 Mark B. Hawk View
19-0133 Dangerous Goods SME William Canterbury View
19-0075 LORD Corporation, Saegertown Operations Erik W. Steinbeck View
18-0147 Evonik Corporation Robert Miller View
18-0139 SorbTech, Inc. Joanna Kilburn View
17-0082R Save the Situation Eva Glimsche View
18-0004 Commercial Vehicle Safety Alliance View
17-0114 PHI.Inc Mr. Terry Myer View
17-0106 3M Cottage Grove Mr. Allen Grantham View
17-0072 Navarro Research and Engineering, Inc Lee Stevens View
07-0017 The Valspar Corporation Eric Barcaskey View
14-0181 Duke Energy Corporation Mr. Chuck Denny View
01-0210 Shell Chemicals Mr. David Mashinski View
02-0149 Office of Hazardous Materials Enforcement Doug S. Smith View
99-0089 Delta Air Lines Inc. Mr. Inman Beavers View
12-0207 Railroad Regulatory Safety Services Mr. Raymond Kasey View
10-0194 Alaska Air Group, Inc. Mr. Mike Tobin View
07-0181 Landstar Carrier Services Mr. Wes Pace View
03-0229 Lion Technology, Inc. Mr. Marc Kleinman View
01-0137 R+L Carriers Mr. Dana Probasco View
14-0222 Enterprise Products Mr. Christopher Scavone View
15-0119 Information and Insights Mr. Kevin Skerrett View
15-0109 US Ecology - Regional Office Mr. Brian Kucharski View
05-0247R Vanderbilt Chemical Corporation Murray Division Mr. Joe Curtis View
02-0201 3M General Office Raymond T. Duzynski View
00-0356 Clean Harbors Environmental Services, Inc. Mr. Paul M. Krug View
99-0310 The Texas A&M University System Mr. Jeff R. Bowman View
08-0004 Hyundai America Shipping Agency Mr. Herb Giles View
08-0280 Cerasis Inc. Mr. Frank Adams View
09-0166 Georgia Department of Public Safety Capt. Bruce Bugg View
14-0135 Western Refining Mr. Victor Garcia View
13-0018 Association of American Railroads Mr. Matthew Forister View
98-0413 Sierra Chemical, Co. Mr. Ron Shan View
08-0248 American Trucking Associations Mr. Richard Moskowitz View
02-0103 R+L Carriers Dana Probasco View
14-0138R Polytek Development Corp. Ms. Cynthia Salisbury View
08-0132 Idaho State Police Mr. Thomas Wright View
99-0039 BP Oil Company Mr. J. J. Quandt View
99-0012 Safety-Kleen Corporation Mr. Jerry Davis View
06-0277 National Solid Wastes Management Association Ms. Alice P. Jacobsohn View
05-0269 ASTAR Air Cargo Inc. Mr. Gerry G. Kefalinos View
17-0016 Energy & Natural Resources Industries and EHS & Sustainability Products Mr. Brian Harmon View
16-0104 Ms. Amanda Hammon View
14-0027 URS Corporation Mr. Andrew Romach View
08-0037 Allied Universal Corporation Mr. Robin J. Eddy Bolte View
15-0165 Air General Mr. Dennis Franco View
07-0212 Georgia Department of Public Safety Capt. Bruce Bugg View
98-0356 CYS Management Services, Inc. Ms. Jodi Smith View
14-0024 Rinchem Mr. Matt Fernandez View
15-0059 Cargolux Airlines International SA Mr. Gerard Guillaume View
15-0056 Regulatory Resources, Inc. Mr. W.A. Winters View
08-0093 Woodard & Curran Ms. Kelly V. Camp View
10-0015 Defense Ammunition Center Ms. Vickie A. Lewis View
09-0093 Valspar Mr. Eric Barcaskey View
17-0044 Laidlaw Carriers Tank LP Mr. Jim O'Hara View
03-0079 ONDEO Nalco Company Ms. Anita S. Knight View
07-0185 Brenntag Mid-South, Inc Mr. A. B. Eargood View
98-0014 DRMO-Luke Mr. Eddie Ellis View
11-0258 The University of North Carolina at Chapel Hill Department of Environment, Health & Safety Mr. Daniel Vick View
15-0227 Artisan EHS Consulting, LLC. Mr. David Comen View
02-0267 Duratek Federal Services, Inc James H. Portsmouth View
04-0225 Shane Havoc Consulting, LLC Gregory Sutherland, Ph.D View
06-0224 Rohm and Haas Company Ms. Carrie Wayne View
04-0216 ARUP Laboratories Mr. Paul Brinton View
06-0190 RWE NUKEM Corporation Mr. Stan Hodges View
04-0262 Baker Atlas Ms. Shelly Espinoza View
10-0155 DuPont Company Mr. Randolph Martin View
07-0113 Waste Technology Services, Inc. T.L. Nebrich. Jr., CHMM, QEP. REM View
09-0201 Hazmat, Inc. Mr. Paul J. Dambek View
05-0107 Reactives Management Corporation Ms. Cherie Walton View
12-0068 Argonne National Laboratory Mr. Lee Stevens View
13-0231 Universal Well Services, Inc Mr. Tom Cloud and Ms. Janell Agnew View
13-0234 Strem Chemcials, Inc. Mr. Jason M. Stevens View
02-0276 Duratek Federal Services, Inc James H. Portsmouth View
14-0069 Environmental Management, Inc. Mr. Jamie Newton View
00-0096 Huntsman Corporation Mr. Philip Abraham View
08-0106 Roeder Cartage Company, Inc. Mr. Robert Mitchell View
15-0020 South Carolina Department of Health and Environmental Control Bureau of Laboratories Mr. Brian Gootee View
16-0054 Infotrac, Inc. Mr. Jason Kob View
00-0097 P.B.&S. Chemical Company, Inc. Mr. Kevin Walker View
02-0311 CSX Lines, LLC Cliff Bartley View
05-0170 Mr. J.H. Cleveland View
04-0159 Chenega Technology Services Corporation Mr. Christopher Purdom View
08-0099 DPC Industries, Inc. Ms. Charlcye Sells View
04-0182 Occupational Safety Specialists Mr. Steve Laughlin View
01-0241 Westinghouse Mr. Christian W. Solum View
14-0231 PPG- Comex Mr. Israel Villarello View
15-0085 Transport Corp. of America Mr. Greg Payne View
14-0242 Bureau of Radiation Protection Ms. Celia Rajkovich View
10-0245 Air Transport International, L.L.C. Mr. Dave Bell View
05-0118 Mr. Joe Cleveland View
04-0177 Environmental Management & Controls, Inc. Ms. Gaye Nelson View
13-0065 Huntsman LLC Mr. Mike Stillwell View
10-0081 Gilmore Environmental Consulting, LLC Mr. John Thompson View
14-0138 Polytek Development Corp Mr. Keith E. Smith View
14-0140 Centers for Disease Control and Prevention Dr. Paul Meechan View