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Who needs to be licensed for plumbing in Colorado?

Any person who wishes to engage in plumbing work at the business, trade, or calling of a residential, journeyman, or master plumber in the state.

What are the types of plumbing licenses available in Colorado?

  • Residential Plumber
  • Journeyman Plumber
  • Master Plumber

How do I get a master plumber license in Colorado?

  1. Complete the five full-time years (60 months/9,780 hours) of comprehensive, hands-on experience.
  2. Complete an Affidavit of Experience form
  3. Sign up for your Master Plumbers exam on
    • If you pass, you will immediately receive a successful notification and should retain this notification to submit with your application for licensure. The successful notification will provide instructions on how to apply for a license. NOTE: You are not authorized as a licensed plumber until you submit a complete application and it is approved by the Division of Professions and Occupations.
    • If you do not pass you will receive a score report that provides areas that require additional studying in order to pass.
  4. Apply for the license:
    • File a license application with the Board at
    • Upon approval from the Board you will receive a notification email with your license attached.
    • Passing of an examination is not a guarantee of licensure. You must still demonstrate that you meet minimum qualifications for licensure according to standards set by Colorado law.

What code is the Colorado plumbing test based on?

International Plumbing Code, 2018

What are the examination fees for a master plumbers’ license in Colorado?


What does your Colorado plumber exam prep cover?

  • Administration, Scope and Intent/Purpose
  • Definitions and Symbols
  • Plumbing Math
  • General Regulations
  • Fixtures, Faucets, and Fixture Fittings
  • Water Heaters
  • Water Supply and Distribution
  • Sanitary Drainage
  • Indirect and Special Waste
  • Vents
  •  Traps, Interceptors, and Separators
  • Storm Drainage
  • Nonpotable Water Systems
  • Subsurface Landscape Irrigation Systems
  • Appendix E
  • Isometrics
  • Private Sewage Systems
  • International Fuel Gas Code
  • Hands-On Practical Application
  • Practice Tests

Bonus Materials

  • Reading and Understanding the Bulletin
  • Books That You Should Have During the Exam
  • Effective Study Techniques

What can I expect from the Colorado master plumbing exam?

120 Scored Items - 270 Minutes
70% (84 Items Correct) to Pass
Up to 10 Non-Scored Items - 30 Minutes

Examination Content Area # of Items

  • Water Supply 14
  • Vents 22
  • Fixtures and Equipment 10
  • Piping Support and System Protection 6
  • Traps, Interceptors, and Separators 6
  • Storm Drainage Systems 12
  • Sanitary Drainage Systems 22
  • Indirect and Special Waste Piping 6
  • Isometric Analysis 10
  • Residential Fire Sprinklers 6
  • Water Heaters 6

Is the Colorado plumber exam open book?

Yes, you will be provided copies of the books when you enter the exam.

What should I bring to the Colorado plumber exams?

  • Two forms of identification, which bear your signature. One of these must be government issued, have your signature and your photograph.
    • Your name as shown on the examination registration must match exactly the name on the photo I.D. you present at the test
  • Arrive 30 minutes prior to appointment.

Where can I take the Colorado plumber exam?

  • Denver (Centennial)
  • Denver (Wheat Ridge)
  • Fort Collins
  • Pueblo
  • Colorado Springs
  • Grand Junction
  • Durango

How do I know if I passed the Colorado plumber exam?

  • On screen – your result will appear immediately on the computer screen. This will happen automatically at the end of the time allowed for the examination; if you are using review features, you will be able to obtain your result immediately when you indicate that you have finished and would like to see your results.
    • If you pass, you will immediately receive a successful notification.
    • If you do not pass, you will immediately receive an unsuccessful notification on the screen along with a diagnostic report indicating your strengths and weaknesses by examination type.
  • On paper – a score report will be printed at the examination site.

Are there accommodations for individuals with special needs during the plumbing licensing exam?

All examination centers are equipped to provide access in accordance with the Americans with Disabilities Act (ADA) of 1990, and exam accommodations will be made in meeting a candidate’s needs. Applicants with disabilities or those who would otherwise have difficulty taking the examination must fill out the form at the end of this Candidate Information Bulletin and fax it to PSI (702) 932-2666. This form also includes out-of-state testing requests.

Does Colorado offer reciprocity for plumbing licenses?

Licensees from another state may be eligible for licensure by endorsement providing that the applicant possesses credential and qualifications that are substantially equivalent to requirements in Colorado for licensure by examination and you must provide verification of all of the following:

  • Completion of a state or federally approved apprenticeship program, or completion of the required years and type of experience for the comparable license.
  • Submit verification from the state licensing agency of successful completion of a comparable state plumbing examination as outlined under "Documenting Plumbing Experience" and based on the currently adopted Colorado Code.
  • Submit a photocopy of your currently held state (not city or county) issued license which you have held for a minimum of six (6) months.
  • Submit a completed application with letters of verification of your plumbing experience as outlined under "Documenting Plumbing Experience" (above) for the license category for which you are applying for endorsement.

An Apprentice must be registered until such time as the individual has actually obtained a Colorado plumber's license. A plumbing apprentice is any individual employed in the plumbing trade that is not currently licensed in the State of Colorado.

Is there any way to be waved from the Colorado plumbing exam?

Yes, if you are eligible for a reciprocal license.

Who issues Colorado plumbing licenses?

Division of Professions and Occupations
1560 Broadway, Suite 1350
Denver, CO 80202

Phone: (303) 894-7800
Fax: (303) 894-7693

Useful links:

Colorado Exam Bulletin

  • Information Last Updated: 09/2020
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