Plumber License Requirements in Colorado
License RequiredLast verified March 9, 2026
Agency And Exam
Reciprocity And License Levels
License levels
Residential PlumberJourneyworker PlumberMaster Plumber
Reciprocity states
None listed
Notes
Colorado licenses Residential Plumber, Journeyworker Plumber, and Master Plumber. The Board's applications page says examinations are administered through a private testing agency and directs approved applicants to PSI for the candidate handbook; it also allows licensure by endorsement for substantially equivalent out-of-state credentials. Verified against the Colorado State Plumbing Board applications page on 2026-03-09.