If you provide, attempt to provide, or offer to provide plumbing or gas services in
the State of Maryland without a license issued by the Maryland Board of Plumbing, you are violating
the State Law and running a risk of going to jail. You must hold the proper category of license
issued by the Maryland Board of Plumbing in order to provide plumbing, propane gas, or natural gas
services in the State.
Apprentices must be licensed, supervised and under the control of a Master or Journey level State
licensee present on the jobsite. Apprentices cannot legally do any plumbing or gas work alone.
While a journey plumber license is in effect, it authorizes the licensee to provide plumbing
services only under the direction and control of a master plumber or a holder of a limited master
Master Plumber - Insured
Only insured master plumbers can enter into contracts to perform plumbing or gas services. Each
master plumber shall display the master plumber license and the license number conspicuously in the
principal place of business of the master plumber; and the license number of the master plumber
license on each vehicle used on the job for providing plumbing services.