What you need to do to become a licensed plumber

A plumbing license is a credential issued by your state or local government that shows you have met training and testing requirements to work on water, gas, and waste systems in buildings. The path to licensure involves apprenticeship, on-the-job hours, classroom instruction, and a written exam — the exact requirements and timeline vary significantly by state and sometimes by city. Most states require between 4 and 5 years of documented work experience before you can sit for the journeyman exam, and some require additional years before you can become a master plumber.

Unlike a driver's license, which is issued by one state agency, plumbing licenses are controlled by different bodies depending on where you live. Some states have a single statewide board; others let individual cities or counties set their own standards. This means the steps, costs, and timeline for getting licensed in Florida are different from those in California or New York. Before you start, you need to know which authority governs plumbing in your specific location.

Key Takeaways

  • Most states require you to complete a registered apprenticeship program that combines classroom hours and paid on-the-job training, typically lasting 4 to 5 years.
  • You must log a specific number of work hours — usually between 8,000 and 10,000 — and have them verified by your employer or apprenticeship program before you can test.
  • The journeyman plumber exam covers plumbing code, safety, math, and practical knowledge, and you must pass it to work independently in most states.
  • Your state or local plumbing board is the only source for the exact requirements, exam dates, and fees that explore where you live and work.

Finding the apprenticeship program in your area

An apprenticeship is the standard entry point into plumbing. You work as a paid apprentice under a licensed plumber, earning wages while you learn, and you attend classroom instruction on nights or weekends. The apprenticeship is registered with either your state's Department of Labor or a joint labor-management program, which means your hours are officially tracked and count toward your license.

To find an apprenticeship, start with the U.S. Department of Labor's apprenticeship database at apprenticeship.gov. Search for "plumbing" and your state or city. You will see programs run by unions, trade schools, and private contractors. Union apprenticeships (often called "union plumber" programs) are typically more competitive but offer strong wages and benefits; non-union programs may be easier to enter but vary more in quality and pay.

You can also contact your state's Department of Labor directly — they maintain a list of registered programs and can tell you which ones are currently accepting apprentices. Some programs have waiting lists; others hire year-round. Call ahead to ask about process important date and whether you need to pass a pre-apprenticeship test or interview.

Meeting the work-hour requirement before you test

Every state requires you to complete a minimum number of paid work hours under a licensed plumber before you can sit for the journeyman exam. This number is usually between 8,000 and 10,000 hours — roughly 4 to 5 years of full-time work. Your apprenticeship program tracks these hours, and your employer or program coordinator signs off on them.

The hours must be documented. Your apprenticeship program will give you a record book or online portal where each day's hours are logged. When you are ready to test, you will submit this record as proof that you have met the requirement. If hours are missing or not verified, the plumbing board will not let you sit for the exam, so keep your records organized and ask your employer to sign off regularly rather than waiting until the end.

Some states allow a portion of your hours to come from classroom instruction or related work (like plumbing supply sales), but most require the majority to be hands-on installation and repair work. Ask your apprenticeship coordinator which types of work count toward your total.

Completing classroom and code training

Alongside your work hours, you must complete classroom instruction in plumbing code, safety, math, and system design. This is usually 300 to 600 hours spread over your apprenticeship years, often taught one or two nights per week or in intensive blocks. Your apprenticeship program arranges this — you do not find it separately.

The classroom work focuses on the plumbing code used in your state or region. Plumbing codes are detailed rules about pipe sizing, venting, water pressure, and safety that vary by location. You need to know the specific code that governs your area, not a generic version. Your program will teach you the code that applies where you work.

Some programs also require you to pass intermediate exams or certifications before you can test for your journeyman license. Ask your program coordinator what checkpoints you need to hit and when.

Registering for and passing the journeyman exam

Once you have completed your work hours and classroom training, you register with your state or local plumbing board to sit for the journeyman plumber exam. The board will verify that your hours are documented and that you meet all other requirements before they let you test.

The exam is written and usually covers plumbing code, math (for pipe sizing and slope calculations), safety, and practical troubleshooting. It typically has 100 to 150 questions and takes 3 to 4 hours. You need to pass with a score that varies by state — often 70 to 75 percent. Some states offer the exam multiple times per year; others offer it only once or twice. Check your plumbing board's website for exam dates and registration important date.

Study materials are available through your apprenticeship program, trade schools, and online. Many people take a prep course in the months before the exam. The exam fee varies by state but is usually between $100 and $300.

Getting your license after you pass

After you pass the journeyman exam, you explore for your journeyman plumber license through your state or local plumbing board. You will submit your exam results, proof of work hours, and an process form. The board reviews these documents and issues your license, usually within a few weeks.

Your journeyman license allows you to work independently as a plumber and to supervise apprentices. You can now take jobs on your own or work for a plumbing company as a licensed tradesperson. Some states require you to renew your license every 1 to 3 years by paying a fee and sometimes completing continuing education hours.

If you want to become a master plumber — a credential that allows you to run your own plumbing business and design plumbing systems — you will need additional years of experience (usually 2 to 5 more years) and to pass another exam. Master plumber requirements vary widely by state.

Costs and timeline overview

The total cost of becoming a licensed plumber includes apprenticeship tuition (if any), exam fees, and license fees. Union apprenticeships are often free or low-cost because the union covers training expenses; non-union programs may charge tuition ranging from a few hundred to several thousand dollars. Exam and license fees typically total $200 to $500. Over the full apprenticeship, you will also spend money on tools, work clothes, and transportation.

The timeline is typically 4 to 5 years from the start of your apprenticeship to passing the journeyman exam, assuming you work full-time and complete all requirements on schedule. If you work part-time or your program has a waiting list, it may take longer. Some people complete their hours faster by working overtime or in high-demand markets where plumbing work is steady.

Frequently Asked Questions

Do I need a high school diploma to become a plumber?

Most apprenticeship programs require a high school diploma or GED, though some accept applicants without one if they pass a basic math and reading test. Check with the specific programs in your area — requirements vary.

Can I get a plumbing license in one state and work in another?

No. Plumbing licenses are issued by individual states or cities and are not transferable. If you move, you will need to get a license in your new state. Some states offer reciprocity agreements that shorten the process if you already hold a license elsewhere, but you must still explore and may need to pass a local exam.

What if I already have plumbing experience but no apprenticeship?

Some states allow you to test for a license based on documented work experience alone, without a formal apprenticeship. You will need to prove your hours to your plumbing board and may need to pass additional exams. Contact your state or local plumbing board to ask whether this path is available and what documentation they require.

How much do plumbers make after getting licensed?

Wages vary by location, experience, and whether you work for a company or run your own business. Licensed journeyman plumbers typically earn between $50,000 and $80,000 per year, with master plumbers and business owners often earning more. Your apprenticeship program can give you local wage information.

Where do I find my state or local plumbing board?

Search online for "[your state] plumbing board" or "[your city] plumbing license." You can also contact your state's Department of Labor or Department of Licensing — they can direct you to the right agency. The board's website lists requirements, exam dates, fees, and how the process works.