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The licenses and certs that move your career and your pay forward. Here's what each one is, how to earn it, and how often you renew.
The state-regulated ladder. These are legally required to work, and they map to the stages on the roadmap, plus the contractor license for running your own business.
| Credential | What it is | How to get it | Renewal |
|---|---|---|---|
State Apprentice Registration State plumbing board | The formal first step in most states. You register with the state plumbing board so your on-the-job hours legally count toward your journeyman license. | Register with your state board, usually requiring you to be at least 16 to 18 and enrolled in or hired into an apprenticeship. | Renew during apprenticeship (varies by state) |
State Journeyman Plumbing License State plumbing board | The core working license. Lets you install, repair, and service plumbing independently. Requirements vary by state and a few states do not license at the state level. | Complete your apprenticeship hours (commonly 8,000 to 10,000) plus required code classroom hours, then pass the state journeyman exam. | Every 1 to 3 yrs, plus continuing education (varies by state) |
State Master Plumber License State plumbing board | The top license. Lets you pull permits, supervise journeymen, and run your own plumbing business. Offered in states that have this tier. | Hold a journeyman license for the state-required years (commonly 1 to 4), then pass the master exam covering code, design, and business law. | Every 1 to 3 yrs, plus continuing education (varies by state) |
State plumbing board
The formal first step in most states. You register with the state plumbing board so your on-the-job hours legally count toward your journeyman license.
State plumbing board
The core working license. Lets you install, repair, and service plumbing independently. Requirements vary by state and a few states do not license at the state level.
State plumbing board
The top license. Lets you pull permits, supervise journeymen, and run your own plumbing business. Offered in states that have this tier.
Safety and training credentials you earn alongside your license. Issued by national bodies rather than a state board.
| Credential | What it is | How to get it | Renewal |
|---|---|---|---|
Backflow Prevention Certification ASSE International (state-recognized) | The signature plumbing specialty cert. Qualifies you to test and repair backflow assemblies that protect drinking water, and opens high-value commercial work. | Complete a backflow training course (commonly 32 hours) and pass the ASSE tester or repairer exam. | Recertify about every 1 to 2 yrs |
Medical Gas Piping Certification ASSE International / NFPA 99 | Qualifies you to install and maintain medical gas systems in hospitals and healthcare facilities under NFPA 99. Unlocks specialized healthcare work. | Complete a medical gas installer course and pass the certification exam; significant field experience is expected first. | Recertify periodically (varies by program) |
OSHA 10-Hour OSHA-authorized trainer | Core jobsite safety card many contractors require before you can work on a construction or commercial site. | Complete a 10-hour construction safety course, online or in person. | No expiration (refresh recommended) |
Green and Water-Efficiency Certification Industry training providers | An optional credential covering sustainable plumbing and water-efficient systems, increasingly relevant as green building codes spread. | Complete a green plumbing or water-efficiency course from an approved provider and pass the assessment. | Varies by program |
ASSE International (state-recognized)
The signature plumbing specialty cert. Qualifies you to test and repair backflow assemblies that protect drinking water, and opens high-value commercial work.
ASSE International / NFPA 99
Qualifies you to install and maintain medical gas systems in hospitals and healthcare facilities under NFPA 99. Unlocks specialized healthcare work.
OSHA-authorized trainer
Core jobsite safety card many contractors require before you can work on a construction or commercial site.
Industry training providers
An optional credential covering sustainable plumbing and water-efficient systems, increasingly relevant as green building codes spread.
Apprenticeship hours reflect U.S. DOL registered apprenticeship standards. Safety-card and retraining intervals follow the relevant OSHA and NFPA standards. Licensing, renewal cycles, and exam prerequisites vary by state, so always verify current requirements with your state licensing board.
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