Plumber License Requirements in Maryland
License RequiredLast verified March 9, 2026
Agency And Exam
Issuing agency: Maryland Department of Labor, State Board of Plumbing
Official licensing agency website
Exam provider: PSI
Reciprocity And License Levels
License levels
Apprentice PlumberJourneyman PlumberMaster PlumberNatural Gas FitterPropane Gas Fitter
Reciprocity states
None listed
Notes
Maryland licenses plumbing through the State Board of Plumbing. Current Department of Labor materials cover apprentice, journeyman, master plumber, natural gas fitter, and propane gas fitter credentials, and they provide both standard and out-of-state application packets for board review. Verified against Maryland Department of Labor plumbing licensing materials on 2026-03-09.