Registration, Certification and License Search

Conduct a search for registered plumbers and air conditioning and refrigeration (ACR) contractors, certified individuals, registered transport units and licensed companies.

The search features on this web page were formerly available at

Use the following PDF PDF file icon documents and Excel Excel File iconspreadsheets to:

  • verify registered Master and Journeyman plumbers or ACR contractors;
  • verify certified individuals;
  • determine continuing education due dates for certified individuals; and
  • determine when inspections are due for transport units registered with the Railroad Commission of Texas.

Master and Journeyman Plumbers and ACR Contractors:
 PDF or Excel

Certified Individuals: PDF or Excel

Registered Transport Units:  PDF or Excel

Use the following PDF documents and Excel spreadsheets to look up companies licensed with the Commission. Please see the License Categories links to the right for an explanation of these categories.




  • Category 15 PDF
  • Category 20 PDF
  • Category 25 PDF
  • Category 30 PDF
  • Category 35 PDF
  • Category 40 PDF
  • Category 45 PDF
  • Category 50 PDF
  • LNG Categories Excel

You may use the find feature in either Adobe (PDF) or Excel (spreadsheet) to locate a specific person, company or transport unit. The find feature in Adobe can be opened using Ctrl + F or through the Edit menu. The find feature in Excel can be opened using Ctrl + F or through the Home menu.