Colorado Plumbing Exam

The Colorado Plumbing License Exam covers many topics including: Vents & Venting; Administrative Procedures; Fixtures; Drainage Systems and more.  Whether you live in Denver, Boulder, Colorado Springs or another city or county, the resources below will help you get started:

Need of a License:  Residential, journeyman and master plumbers need a license to work in Colorado. 

Who Grants a License:  Plumbing licenses are issued by the Colorado Department of Regulatory Agencies - Examining Board of Plumbers (DORA).

Procedures for Getting a License:   Candidates must take an exam to obtain a license unless you have been licensed in another state and meet Colorado's reciprocity requirements.

Qualifications to take the Exam and receive a License: A candidate for the residential plumbing  license must show 2 years or 3,400 hours of practical experience.  A candidate for the journeyman plumbing license must have 4 years or 6,800 hours of practical experience.  A candidate for a master plumbing license is required to have had 5 full-time years of practical experience.

Test Content:   The exams have a multiple choice format .   A list of subjects the test covers is given at DORA.  Candidates for the residential and journeyman plumber licenses need a 70% score to pass the exam.  Master plumbers need a score of 75% to pass.

How to Apply for the Test:  You can access the journeyman plumber application online at DORA.   

Mail the completed application to:

     Division of Registrations

     Office of Licensing-Plumbing

     1560 Broadway, Suite 1350

     Denver, CO  80202

Fees:  There are fees to take the test.

License Renewal:  Licenses must be renewed by August 31st of odd numbered years.  There is no continuing education requirement.

Applicable Code:    Colorado follows the International Plumbing Code established by the International Code Council.


For more information on licensing and exam preparation, go to's

Journeyman Plumbing Test Guide

Master Plumbing Test Guide

And take's Plumbing Practice Test.

For plumbing exam preparation products and services, such as study guides, practice tests, flashcards and courses, go to's Journeyman Plumber Exam and Master Plumber Exam listings.