Plumber License Requirements by State (2026)

Plumbers are licensed in the majority of US states, either at the state level or through local jurisdictions. Requirements vary significantly -- from 2 years of experience in Alabama to 7 years for a Master Plumber in New York City. This guide covers plumber license requirements across all 50 states, including experience hours, exams, costs, and reciprocity options.

How Plumber Licensing Works in the US

Plumbing is one of the most consistently regulated trades in the country. Unlike general contracting (where many states have no statewide license), most states require plumbers to hold individual credentials. The licensing structure follows a tiered progression:

License Tiers: Apprentice to Master

Almost every state uses some variation of this four-tier system:

1. Apprentice/Trainee -- Entry level. No experience required to start. You must work under the direct supervision of a licensed journeyman or master plumber. Most apprenticeships last 4-5 years.
2. Journeyman Plumber -- The standard working license. Requires completing an apprenticeship (typically 4 years / 8,000 hours) and passing an exam. A journeyman can work independently but cannot pull permits or supervise apprentices in all states.
3. Master Plumber -- The highest individual credential. Requires additional experience beyond journeyman (typically 1-3 years) and a harder exam. Master plumbers can supervise others, pull permits, and run a plumbing business.
4. Plumbing Contractor -- A business-level license. Some states issue this separately from the master plumber credential. Requires employing a licensed master plumber and meeting financial/insurance requirements.

Not every state uses all four tiers. California, for example, licenses at the contractor level only (C-36 Plumbing) and does not have separate journeyman or master designations at the state level. Arizona also licenses at the contractor level through the ROC.

Experience Requirements by State

Experience requirements are the biggest variable in plumber licensing. Here is how the states requiring a statewide plumber license compare:

The lowest experience requirements are in Alabama (2 years for journeyman) and Tennessee (1 year for the Limited Licensed Plumber tier). The highest are in New York City (7 years for master plumber) and Washington (8,000 hours / 4 years for journey level).

Exam Requirements

Plumber exams test your knowledge of plumbing codes, system design, safety, and installation methods. The two primary plumbing codes used in exams are:

• International Plumbing Code (IPC) -- Used by the majority of states, including Alabama, Georgia, Colorado, Tennessee, and most of the eastern US.
• Uniform Plumbing Code (UPC) -- Used primarily in western states including California, Washington, Oregon, and Arizona.

Exams are administered by national testing providers. PSI Services handles plumber exams in most states. Pearson VUE administers exams in Florida and a few others. Some states like New York City use their own testing through the Department of Buildings.

Passing scores are typically 70%, though Alabama requires 70% for both journeyman and master levels. Tennessee requires 73%. Most exams are open-book, allowing you to bring approved code references.

Costs by State

Plumber licensing costs vary widely. In Alabama, a journeyman license runs about $235 (application + exam + license). In Florida, expect around $399 (application + exam). New York City is the most expensive, with total costs exceeding $1,800 for a master plumber including exam fees, background checks, and license issuance.

California's C-36 plumbing contractor license costs $699 in initial fees (application + license + fingerprinting). Arizona charges $701 (application + exam + license + fingerprinting).

On top of licensing fees, plumbing contractors typically need:

• Surety bonds: $2,000-$25,000 face value (premium is 1-5% annually)
• General liability insurance: $500-$2,000/year
• Workers comp: required in most states if you have employees

States Without Statewide Plumber Licensing

A handful of states do not license plumbers at the state level. In these states, licensing is handled by cities and counties:

• Kansas -- no statewide plumber license; municipal licensing only
• Missouri -- no statewide plumber license; municipal licensing only
• Nebraska -- no statewide plumber license; municipal licensing only
• New York -- no statewide plumber license; municipal licensing only
• Pennsylvania -- no statewide plumber license; municipal licensing only
• Wyoming -- no statewide plumber license; municipal licensing only

In these states, major cities (Philadelphia, New York City, Chicago, Indianapolis) have their own rigorous licensing requirements. Rural areas may have minimal or no licensing beyond building permits.

Bond and Insurance Requirements for Plumbers

Bond and insurance requirements for plumbers vary by state:

• California: $25,000 contractor license bond. General liability recommended. Workers comp required with employees.
• Georgia: $10,000 surety bond deposited with the county probate court. Workers comp required for 3+ employees.
• Alabama: $2,000 surety bond for master plumbers at the local level.
• Washington: $6,000 plumbing contractor bond (separate from the $30,000 general contractor bond). Plus $250,000 GL required.
• Colorado: $10,000 bond plus $500,000 minimum GL for plumbing contractors.
• Florida: No bond required for plumbing contractors. GL required.
• Texas: No bond required. Insurance recommended but not mandated by the state board.

Plumber License Reciprocity

Plumber license reciprocity is more limited than general contractor reciprocity. Most states require you to take their own exam regardless of where you are currently licensed. However, some reciprocity options exist:

• Washington-Idaho: Journey level plumber reciprocity. Idaho-licensed plumbers may waive the trade portion of the Washington exam.
• Southeastern states: Tennessee has reciprocity agreements with Alabama, Georgia, Mississippi, and others that may include plumbing trades -- though the trade exam waiver typically applies to the contractor-level exam, not the individual plumber exam.
• NASCLA states: The National Association of State Contractors Licensing Agencies (NASCLA) offers accredited exams for plumbing contractors that are accepted by multiple states.

For the most current reciprocity information, check our reciprocity guide or select your target state below.

How to Get Started

The path to a plumber license typically follows these steps:

1. Register as an apprentice/trainee with your state board
2. Complete 4-5 years (8,000+ hours) of supervised work experience
3. Meet classroom education requirements (576 hours is common)
4. Apply and sit for the journeyman plumber exam
5. Pass with 70%+ and pay your license fee
6. Work as a journeyman for 1-3 years to qualify for master plumber
7. Pass the master plumber exam if you want to run your own business

In states like Louisiana, there is no formal experience requirement -- passing the exam is the only competency gate. In Tennessee, you can start with a Limited Licensed Plumber credential after just 1 year of experience, allowing you to work on projects under $25,000.

Frequently Asked Questions

Find Your State's Requirements

Select your state for detailed plumber licensing requirements, including current fee schedules, exam topics, application forms, and processing times.

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