Note: Licensing requirements, fees, and experience thresholds change regularly. This guide reflects 2026 data from state licensing boards and official sources. Always verify directly with your state's licensing authority before applying. Official links are provided throughout.
The short version
Plumbing is one of the most uniformly licensed trades in the United States — virtually every state requires some form of credential, and the rules change the moment you cross a state line. The standard path runs apprentice → journeyman → master plumber → plumbing contractor license. Six states (Colorado, Kansas, Missouri, New York, Pennsylvania, and Wyoming) have no statewide license but regulate through local cities and counties. Texas and Missouri require the most experience for master licensure — 12,000 hours. New York City runs one of the strictest systems in the country. California requires passing both a trade exam and a separate law exam through the CSLB. This guide maps the whole picture for plumbing contractors and business owners specifically — not just how to get licensed, but what you need to legally run a plumbing business in each state.
A journeyman card that lets you pull permits in Texas means nothing in California, where the business entity itself needs a C-36 contractor license. Move to New York and there’s no state license at all — but New York City runs one of the strictest master plumber credentialing systems in the country. Go to Colorado and the state doesn’t issue plumbing licenses, so you’re dealing with Denver’s rules, Colorado Springs’ rules, and Boulder’s rules as three separate systems.
That patchwork is exactly what trips up plumbers who relocate, hire across state lines, or want to expand a service business into a second market. This guide is written for plumbing contractors and business owners who need the full picture — not just the individual license ladder, but what it takes to legally operate a plumbing company in each state.
The license ladder — the four credentials that shape everything
Before the state-by-state breakdown, understand the structure. Most states use some version of a four-rung ladder, and the credential you need to run a business is typically not the same as the one that lets you do the work.
1. Apprentice / Trainee
Entry level. Typically registered with the state or local authority. You work under a journeyman or master. No prior experience required. Most apprenticeships run 4-5 years of combined paid work and classroom hours.
2. Journeyman Plumber
The working license. Typically requires 4-5 years of apprenticeship plus a written trade exam. Allows you to perform plumbing work, often under the oversight of a master. In most states, this is the minimum to perform paid plumbing work independently.
3. Master Plumber
The top individual credential. Typically requires 1-3 more years beyond journeyman plus a harder exam covering code, design, and supervision. In most states, the master is the only person who can pull permits and legally stand behind a plumbing business.
4. Plumbing Contractor License
A separate business credential, distinct from the master license. Usually requires employing or being a master plumber, passing a business and law exam, and meeting bonding and insurance minimums. This is what you need to legally operate a plumbing company.
The key point most new operators miss: the master plumber license and the plumbing contractor license are two different credentials in most states. You need the master license as the individual technical credential, and the contractor license as the business credential. Many plumbers who are technically qualified get this wrong and operate the business without the proper contractor license — which creates the same legal exposure as operating without any license at all.
States with full statewide plumbing licensing
These states issue licenses at the state level for both individual plumbers and contracting businesses. Most require both a master plumber and a contractor license to legally operate a plumbing business.
| State | Contractor License | Master Experience Required | Key Notes |
|---|---|---|---|
| Alabama | REQUIRED | 4,000 hrs journeyman experience | Alabama Plumbing & Gas Fitters Examining Board. Annual renewal, $175 certificate fee. |
| Alaska | REQUIRED | 8,000 hrs + written and practical exam | Department of Labor. $200 application fee. No formal reciprocity — board reviews case by case. |
| Arizona | REQUIRED | 4 years journeyman experience | Arizona ROC licenses contractor, not individual plumbers at state level. Local jurisdictions (Phoenix, Tucson) license journeymen separately. |
| Arkansas | REQUIRED | 1 year journeyman, 4-year apprenticeship before that | Department of Health, Plumbing & Natural Gas Section. Annual renewal, $200/year. |
| California | REQUIRED | 4 years journeyman-level experience | C-36 Plumbing contractor license through CSLB. Must pass trade exam AND law & business exam. $25,000 surety bond. $450 application fee. Individual journeyman licensed locally. |
| Connecticut | REQUIRED | 10,000 hrs — highest journeyman threshold nationally | Department of Consumer Protection. Both journeyman and master require written exams. |
| Delaware | REQUIRED | 8,000 hrs | Licensed at county level — apply to your specific county. Recognizes licenses from CT, IA, and MD (reciprocity). |
| Florida | REQUIRED | Journeyman experience + exam | Florida DBPR. Certified (statewide) or Registered (county-only) license. General liability minimum $100,000 BI / $25,000 PD required. |
| Georgia | REQUIRED | 5 years experience | State Construction Industry Licensing Board. Two classifications: Class I (residential) and Class II (unrestricted). All employees of a plumbing contractor must hold their own master or journeyman license — stricter than most states. |
| Idaho | REQUIRED | 2.5 years as journeyman | Division of Occupational and Professional Licenses. Two-year renewal cycle effective October 2025. $2,000 surety bond required. |
| Illinois | REQUIRED | Journeyman exam required | State licenses journeyman and master plumbers. Chicago has additional local contractor registration requirements on top of state license. |
| Indiana | REQUIRED | Journeyman exam required | Professional Licensing Agency. Contractor license requires proof of insurance and bond. |
| Iowa | REQUIRED | 2 years journeyman + exam | Iowa Plumbing and Mechanical Board. Contractor must employ or be a master plumber. |
| Louisiana | REQUIRED | Journey experience + exam | State Plumbing Board. Contractor license requires master and separate business registration. |
| Maine | REQUIRED | Experience + master exam | Department of Professional and Financial Regulation. Licensed plumber required on all jobs. |
| Maryland | REQUIRED | Journeyman + exam | Maryland DLLR. Master required for contractor license. Recognized for reciprocity by Delaware. |
| Massachusetts | REQUIRED | Journeyman + master ladder | Board of State Examiners of Plumbers and Gas Fitters. One of the more comprehensive state systems. |
| Michigan | REQUIRED | 6,000 hrs over at least 3 years as apprentice | Bureau of Construction Codes. Both written and hands-on practical exam required. Applications valid for one year only — passing scores do not carry over. |
| Minnesota | REQUIRED | Journey experience + exam | Department of Labor and Industry. Contractor requires master plumber. Minneapolis and St. Paul may have additional local requirements. |
| Mississippi | REQUIRED | Journey experience + exam | State Board of Contractors. Offers reciprocity with some states with similar requirements. |
| Montana | REQUIRED | Journey + master ladder | Department of Labor and Industry. Contractor license requires master. |
| Nebraska | REQUIRED | Journey + master ladder | State Plumbing Board. License required statewide with local permits on top in some jurisdictions. |
| Nevada | REQUIRED | Experience + exam | Nevada State Contractors Board. C-1D plumbing specialty contractor license required. |
| New Hampshire | REQUIRED | Master exam required | Office of Professional Licensure and Certification. No state sales tax — beneficial for materials purchasing. |
| New Jersey | REQUIRED | Journey + master ladder | Division of Consumer Affairs. Contractor license requires master plumber. |
| New Mexico | REQUIRED | Journey + master ladder | Regulation and Licensing Department. Master required for contractor. |
| North Carolina | REQUIRED | Journey + master + contractor ladder | State Board of Examiners of Plumbing, Heating and Fire Sprinkler Contractors. |
| North Dakota | REQUIRED | Journey + master ladder | State Plumbing Board. Contractor must employ master. |
| Ohio | REQUIRED | Journey + master ladder | Ohio Construction Industry Licensing Board. Some cities may require additional local registration. |
| Oklahoma | REQUIRED | Journey + master ladder | Construction Industries Board. Contractor requires master plumber license. |
| Oregon | REQUIRED | Journey + master ladder | Oregon Building Codes Division. Contractor bond and insurance required. |
| Rhode Island | REQUIRED | Journey + master ladder | Department of Labor and Training. |
| South Carolina | REQUIRED | Journey + master ladder | Contractors Licensing Board. Residential and commercial classifications available. |
| South Dakota | REQUIRED | Journey + master ladder | State Plumbing Commission. Contractor license requires master. |
| Tennessee | REQUIRED | Journey + master ladder | Board for Licensing Contractors. Nashville metro market growing rapidly. |
| Texas | REQUIRED | 12,000 hrs — highest nationally | Texas State Board of Plumbing Examiners. Six full years of journeyman experience required for master. Journeyman license also required. Separate contractor registration. |
| Utah | REQUIRED | Journey + master ladder | Division of Occupational and Professional Licensing. |
| Vermont | REQUIRED | Journey + master ladder | Office of Professional Regulation. |
| Virginia | REQUIRED | 8,000 hrs + state exam | Board for Contractors. Virginia Plumbing Code exam required. Contractor requires master. |
| Washington | REQUIRED | 8,000 hrs + state exam | Department of Labor & Industries. $141.10 contractor registration fee effective July 2025. $6,000 surety bond. Electronic insurance submission required from January 2026. Monopolistic workers’ comp state — must buy from L&I. |
| West Virginia | REQUIRED | 7,000 hrs + state exam | Division of Labor. License required for work valued at $5,000 or more. |
| Wisconsin | REQUIRED | 6,000 hrs; accepts ICC exam | Department of Safety and Professional Services. |
| Wyoming | LOCAL ONLY | 8,000 hrs + state exam for master | Department of Fire Prevention and Electrical Safety. No statewide contractor license — local jurisdictions regulate. |
The six states with no statewide plumbing license
These states don’t issue a statewide plumbing license but regulate through local cities and counties. This doesn’t mean no license is required — it means the requirements live at the local level, and they vary enormously.
| State | Status | What You Actually Need |
|---|---|---|
| Colorado | LOCAL ONLY | No state plumbing license. Denver, Colorado Springs, Boulder all have separate licensing systems. Denver requires both a journeyman license and a master to pull permits. Colorado does issue a master plumber license for the individual (5 years / 8,500 hours required) — but the contractor license is local. As of June 30, 2025, contractors must display master plumber and registration numbers on vehicles, bids, and business materials. |
| Kansas | LOCAL ONLY | No state plumbing license. Wichita, Kansas City metro, and other cities have their own requirements. Always check the specific municipality. |
| Missouri | LOCAL ONLY | No state plumbing license. Kansas City and St. Louis have extensive local systems. Missouri requires 12,000 hours at the master level (same as Texas, highest nationally) where local licensing exists. Kansas City metro is the key market to research. |
| New York | LOCAL ONLY | No state license. NYC sets the standard most people mean when they ask. NYC Master Plumber: 7 years of total experience within the past 10 years (minimum 2 years as NYC-registered journeyman), plus written and practical exams administered by the NYC Department of Buildings, plus a background investigation. Engineering degree path: 5 years of recent qualifying experience. Other NY cities run independent programs. |
| Pennsylvania | LOCAL ONLY | No state plumbing license. Philadelphia has its own master plumber and journeyman system. Pittsburgh and other cities vary. Always check the specific city or county. |
| Wyoming | LOCAL ONLY | State issues a master plumber license (8,000 hrs + exam) but no statewide contractor license. Local jurisdictions handle contractor regulation. |
The local-only trap: confirming your state has no plumbing license doesn’t mean you’re compliant. The city or county where you actually work almost certainly requires something — a journeyman or master license, a contractor registration, building permits, or proof of insurance. Check both levels every time you enter a new market. The state answer is just the starting point.
States with the strictest requirements for business owners
A few states deserve extra attention because their requirements are either unusually demanding or unusually nuanced for a plumbing contractor specifically.
Texas — 12,000 hours and two separate licenses
Texas requires the most documented experience for a master plumber license of any state — 12,000 hours, equivalent to roughly six full years of continuous journeyman work. The Texas State Board of Plumbing Examiners oversees both the individual journeyman and master licenses, and a separate contractor registration is required to operate the business. The combination of high experience threshold and dual-credential requirement makes Texas one of the more demanding states to establish a plumbing business in from scratch — but also one of the stronger licensed markets because of it. If you’re looking at the Texas plumbing market specifically, understanding the startup pathway is worth the time you invest in it.
California — contractor-level licensing at the CSLB
California licenses plumbing at the contractor level through the Contractors State License Board. The C-36 Plumbing contractor license requires four years of journeyman-level or supervisory experience, passing both a C-36 trade exam and a separate Law and Business exam, a $25,000 surety bond, and workers’ comp coverage. Individual journeyman licensing in California is handled locally — the state regulates the business, the city or county regulates the individual. For a plumbing business wanting to operate statewide, the CSLB contractor license is the credential that matters.
Georgia — every employee needs a license
Georgia has one of the strictest employee-level requirements in the country. Every person performing plumbing work for a Georgia plumbing contractor must hold their own current master or journeyman plumber license — not just the business owner. A master plumber who allows unlicensed work by an employee or subcontractor is personally in violation of state law, regardless of oversight arrangements. For plumbing contractors growing their team in Georgia, verifying each new hire’s individual license status before they touch a job is a non-negotiable step.
New York City — the most demanding local system in the country
NYC’s master plumber license has no state equivalent — it’s a city credential that rivals any state license in complexity. Seven years of experience within the past ten years, at least two of which must be as a registered NYC journeyman, plus both a written and a practical exam, plus a background investigation by the NYC Department of Buildings. The engineering degree path can reduce the total experience requirement to five years. For plumbing contractors targeting the New York City market, this is the license that unlocks the ability to pull permits and run jobs legally in one of the highest-value plumbing markets in the country.
What every plumbing contractor needs regardless of state
Beyond the individual state requirements, these apply broadly regardless of where you operate:
- General liability insurance — almost universally required by state licensing boards, commercial clients, and property managers. Minimum coverage levels vary by state; Florida requires at least $100,000 bodily injury / $25,000 property damage as a licensing condition.
- Workers’ compensation — required in virtually every state for businesses with employees. Washington is a monopolistic state, meaning you must buy coverage from L&I rather than a private insurer. For the full picture on liability when a tech gets hurt, our guide on what happens when a technician gets hurt on the job covers it in detail.
- Surety bond — required in many states as a condition of contractor licensing. Washington requires $6,000; California requires $25,000; Idaho requires $2,000 minimum. Bond amounts are set by state licensing boards and update periodically.
- Business registration — operating as an LLC or registered entity is standard practice, separate from any trade license.
- Building permits per job — required in virtually every jurisdiction for plumbing installations, regardless of whether a state contractor license exists. The master plumber typically pulls the permit and is legally responsible for the work.
Reciprocity — when your license travels
Plumbing reciprocity is less standardized than in some other trades. Most states evaluate out-of-state credentials individually rather than through formal reciprocity agreements. A few concrete examples:
- Delaware formally recognizes licenses from Connecticut, Iowa, and Maryland and may waive experience documentation if standards are substantially similar.
- Mississippi offers reciprocity for contractors already licensed in states with equivalent requirements.
- Alaska has no formal reciprocity but reviews out-of-state credentials case by case.
- Most states: your out-of-state license is not automatically recognized, but it may satisfy some of the experience documentation requirement. Contact the specific state’s licensing board directly before assuming anything transfers.
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START FREE TRIAL →The bottom line
Plumbing is one of the most uniformly licensed trades in the country — but “uniformly licensed” doesn’t mean uniformly simple. The experience thresholds, exam structures, bond minimums, and the crucial distinction between individual and contractor licensing vary enough from state to state that an experienced plumber crossing state lines or expanding a business into a new market can easily end up out of compliance without realizing it.
The two things that catch most plumbing business owners off guard: first, the difference between the master plumber license (individual) and the plumbing contractor license (business entity) — you need both. Second, the local layer that sits on top of state requirements — particularly in the six local-only states, but also in major cities like Chicago and NYC even in states with state licenses.
Get the licensing right in every market you operate in. Pull the permits. Carry the insurance. Verify every employee’s individual credentials in states like Georgia where they’re personally required. The plumbing contractors who build solid businesses are the ones customers can verify, trust on arrival, and call back. A clean license record is the foundation of all of it.
