Does a Plumber Need a License? State-by-State Guide

Yes — all 50 states require plumbers to be licensed, making plumbing one of the most universally regulated trades alongside electrical work. Plumbing licensing requirements are generally stricter than those for general contractors, which do not have universal state licensing. The reason is both public health and financial risk: improperly installed plumbing can contaminate drinking water, cause sewage backups, and lead to catastrophic water damage. Water damage is consistently the number one homeowner insurance claim in the United States, and a significant share of those claims originate from unlicensed or unpermitted plumbing work. Before you hire anyone to touch your pipes, you need to verify their license.

What Is the Difference Between a Master Plumber and a Journeyman Plumber?

Just as with electrical work, plumbing licensing operates on a tiered system, and the tier matters for your project:

• Apprentice Plumber:An apprentice is enrolled in a formal training program, typically through a union apprenticeship or a state-approved program lasting 4–5 years. Apprentices cannot work unsupervised and cannot be the responsible licensee on a job. If a company sends only an apprentice with no supervising journeyman or master on-site, that is a compliance violation in virtually every state.
• Journeyman Plumber:A journeyman has completed apprenticeship training, accumulated the required hands-on hours, and passed a licensing exam. Journeymen can perform most plumbing work independently but typically cannot pull permits or serve as the responsible contractor of record. In most states, a journeyman works under the supervision — though not necessarily the on-site presence — of a master plumber.
• Master Plumber: A master plumber has additional years of experience beyond journeyman status and has passed a more comprehensive exam covering the Uniform Plumbing Code or International Plumbing Code, local amendments, and advanced system design. The master plumber pulls permits, serves as the responsible party on the job, and is accountable to the state licensing board. When you hire a plumbing company, the master plumber's license number should appear on your contract.
• Plumbing Contractor License: Many states issue a separate license to the business entity, distinct from the individual master plumber license. Both the company and the master plumber on staff must be licensed.

For most homeowners, the practical question is whether the company holds a valid plumbing contractor license and whether a master plumber will be the responsible party on your project. For major jobs like sewer line replacement, water heater installation, or bathroom rough-in, this matters significantly.

Does a Plumber Need a License in Every State?

Yes — but the specific licensing authority and requirements vary. Here is how key states handle plumber licensing:

• California: Plumbers must hold a C-36 Plumbing Contractor license issued by the California Contractors State License Board (CSLB). This is a specialty classification covering all plumbing work. Individual plumbers may also need to be registered with their local jurisdiction. Verify at cslb.ca.gov. All work over $500 requires a licensed contractor.
• Florida: Florida requires a Plumbing Contractor (CFC) license through the Florida Department of Business and Professional Regulation (DBPR). The CFC license requires passing both a business and law exam and a plumbing trade exam. Florida also has county-level licensing for some jurisdictions. Verify at myfloridalicense.com.
• Texas: Texas plumbing licensing is administered by the Texas State Board of Plumbing Examiners. Texas licenses apprentice plumbers, tradesman plumbers, journeyman plumbers, master plumbers, and plumbing inspectors — a comprehensive tiered system. Unlike general contractors in Texas (no state license required), plumbers face strict state licensing requirements. Verify at tsbpe.texas.gov.
• New York: New York State does not have a single statewide plumber license. New York City has one of the most rigorous master plumber licensing systems in the country, administered by the NYC Department of Buildings. The NYC Master Plumber license requires a minimum of seven years of experience, including five years as a licensed journeyman, plus a comprehensive exam. Nassau, Suffolk, Westchester, and other counties have their own separate licensing requirements. Always verify at the local authority level in New York.
• Illinois: The Illinois Department of Financial and Professional Regulation (IDFPR) issues plumbing licenses statewide. Illinois has journeyman and master plumber classifications, and the licensed master plumber must oversee all permitted work. Verify at idfpr.illinois.gov.
• New Jersey: New Jersey issues a Master Plumber licensethrough the New Jersey Board of Examiners of Master Plumbers. This is one of the stricter state systems — only a licensed master plumber can supervise plumbing work in New Jersey. Verify at njconsumeraffairs.gov.
• Pennsylvania: Pennsylvania plumbing licensing is primarily administered at the local municipality level. Major cities like Philadelphia have their own licensing boards. However, all plumbing work requires permits regardless of where in Pennsylvania the work is performed.
• Washington: Washington State requires both individual plumber licenses and plumbing contractor business licenses through Washington Labor & Industries (L&I). Washington has journeyman plumber and specialty plumber (restricted to specific systems) classifications. Verify at lni.wa.gov.
• Arizona: The Arizona Registrar of Contractors (ROC) licenses plumbing contractors in Arizona. Arizona also has a separate journeyman plumber certification through the Arizona Department of Occupational Safety. Both the company and individual plumbers must be licensed. Verify at roc.az.gov.
• Georgia: Georgia requires plumbers to be licensed through the Georgia State Construction Industry Licensing Board. Georgia issues journeyman and master plumber licenses, and plumbing contractors must hold a separate business license. Verify at sos.ga.gov.
• Oregon: Oregon requires both individual plumber licenses and plumbing contractor business licenses. Individual licenses are issued through the Oregon Building Codes Division; contractor licenses are issued through the Oregon Construction Contractors Board (CCB). Oregon is one of the strictest states on permit compliance. Verify at oregon.gov/bcd.

Why Does Unlicensed Plumbing Specifically Threaten Your Home Insurance?

This is one of the most underappreciated risks of hiring an unlicensed plumber. Most homeowners assume their insurance will cover any water damage — but that assumption can be wrong in specific circumstances involving unlicensed or unpermitted work.

Here is how the liability chain works: when a plumber performs work without a permit, there is no inspection. If a fitting fails, a connection leaks, or a pipe bursts, and the damage is traced back to plumbing work that was not permitted or performed by an unlicensed contractor, your insurer may invoke a “faulty workmanship” or “improper installation” exclusion. Some policies explicitly exclude damage resulting from work performed without required permits.

Even if your insurer pays an initial claim, they may then seek to recover from the contractor — and if the contractor is unlicensed and uninsured, that recovery will fail, which can complicate your claim. The safer approach is always to hire a licensed plumber who will pull the required permits, so that the work is inspected and on record.

• Permitted plumbing work: A plumbing inspector verifies rough-in connections before walls are closed, confirms pressure test results, and signs off on the installation as code-compliant. This protects you legally and financially.
• Unpermitted plumbing work:No inspection occurs. Defects are hidden in walls and under slabs. When damage manifests, the lack of permits can complicate or void your insurance claim. It can also kill a real estate sale when buyers' lenders discover unpermitted work.

What Questions Should You Ask a Plumber Before Hiring?

Ask these questions before any plumber begins work at your home:

• “What is your license number, and what state or city issued it?” In states like California, Florida, and Texas, this should be a single state license number. In New York, it should be a city or county license number. Write it down and verify it independently.
• “Who is the master plumber on this project?”If you are hiring a plumbing company with multiple employees, ask specifically which master plumber is the responsible licensee. That person's license should be the one on your contract.
• “Will you pull a permit for this work?”Any significant plumbing work — water heater replacement, adding a bathroom, sewer line work, gas line modification — requires a permit in virtually every jurisdiction. If the plumber says permits aren't needed and you have reason to believe they are, that is a red flag.
• “Can I see your certificate of insurance?”Verify both general liability insurance and workers' compensation. Call the insurance company to confirm the policy is active. A pipe rupture in your wall or a worker injured on your property are real financial risks.
• “Do you offer a workmanship warranty?” Licensed plumbers who stand behind their work typically offer a one- to two-year workmanship warranty in addition to any manufacturer warranty on parts. Unlicensed plumbers rarely offer any written warranty.

What Should You Do If You Suspect Your Plumber Is Unlicensed?

If you have concerns about whether your plumber is properly licensed, take these steps:

• Stop work and withhold further payment. You have the right to verify licensing before, during, and after any job. Exercise that right.
• Look up the license number directlyon your state licensing board's website. Confirm the license is active, not expired or suspended, and that the name and company match your contract.
• File a complaint with the state licensing board. Unlicensed plumbing contracting is illegal in every state and can result in criminal charges. State boards take these complaints seriously because of the public health implications of improper plumbing.
• Have completed work inspected by a licensed plumber or home inspector before using the affected systems, especially if gas lines are involved.
• Contact your homeowner's insurance company to report that unlicensed work may have been performed and ask how it affects your coverage.
• Consult an attorney if you have paid a significant deposit or if work is defective. In many states, unlicensed contractors have limited ability to enforce contracts, which may give you legal leverage to recover your money.

How Do You Verify a Plumber's License Before Hiring?

The fastest and most reliable way to verify any plumber's license is through CheckLicensed.com, which searches state licensing databases across all 50 states and returns an instant report covering license status, expiration date, insurance, bond status, and any complaints or disciplinary actions on file. You don't need to know which state agency to search or how to navigate each state's different portal — enter the contractor's name or license number, select your state, and get results in seconds.

You can also verify directly through your state board: CSLB in California, DBPR in Florida, TSBPE in Texas, L&I in Washington, ROC in Arizona, CCB in Oregon, IDFPR in Illinois. In New York, contact the city or county licensing office where the work will be performed.

Water damage is the most common and often most expensive homeowner insurance claim. Most of that damage is preventable with properly permitted, properly licensed plumbing work. The two minutes it takes to verify a plumber's license before they touch your pipes is among the most valuable investments you can make in protecting your home. Use CheckLicensed.com to make that check instant and reliable.