Plumbing License Reciprocity by State: A Contractor's Guide

Thinking about expanding to another state or taking on more plumbing jobs in other regions? Then it’s important you understand license reciprocity. 

Plumbing license reciprocity is the process of transferring some of your licensing qualifications earned in one state to count toward licensing in another.

In this guide, you’ll learn:

• How reciprocity works

• Which states participate in reciprocity

• What restrictions apply in different states

• How to transfer your license

• Mistakes to avoid in plumbing license transfers 

We’ll also show how ServiceTitan helps plumbers stay compliant and operate smoothly across multiple states.

Let’s get started.

What Is Plumbing License Reciprocity?

Plumbing license reciprocity is an agreement between states that allows plumbers already licensed in one state to use part of those credentials when applying for a license in another state. 

This agreement enables the new state to recognize your completed training hours, trade exam results, or your experience, so you don’t need to repeat them.

Reciprocity is particularly useful for plumbers relocating, expanding their service area into neighboring states, or taking on multi-state commercial work. For example, a plumber licensed in New Hampshire may qualify for a simplified licensing process in Vermont because both states follow similar training and experience standards.

Reciprocity is not the same as receiving a new license (or an endorsement). For the latter, states may waive some steps. But you’ll still need to apply, pay fees, verify insurance, and sometimes complete a business or law exam.

How Does Plumbing License Reciprocity Work?

In plumbing license reciprocity, the states compare the training, testing, and experience requirements for plumbers. If two states determine their standards are equivalent or similar, they may choose to recognize each other’s credentials. 

This recognition allows the second state to accept your existing exam results or documented experience rather than requiring you to start from scratch.

However, even when reciprocity is available, plumbers must still submit a formal application to the new state. They may also need to complete additional requirements such as:

• A state-specific business, law, or code exam

• Updated background checks

• Proof of insurance or bonding

• County or city-level registrations

For example, South Carolina may accept a journeyman plumber’s trade exam from Georgia but still require a separate business law test. Texas recognizes training hours from certain states, but requires applicants to take the Texas plumbing law exam.

The main advantage is that plumbers avoid repeating the most time-consuming and lengthy parts of the licensing process, such as redoing trade school hours or retaking an entire technical exam.

What Are the Benefits of Plumbing License Reciprocity?

Reciprocity can be an advantage for plumbers looking to grow or relocate their business. Here are some business-oriented benefits:

• Faster licensing

• Reduced administrative work

• Expanded work opportunities

• Lower licensing costs

• Easier multi-state business expansion

Benefit 1: Faster licensing

With reciprocity, plumbers don’t have to repeat training or retake trade exams they’ve already passed. This reduces the license approval timeline from several months to just a few weeks or even days. 

Benefit 2: Reduced administrative work

Plumbers don’t need to contact trade schools again for transcripts, re-document years of experience, or repeat continuing education requirements that have already been completed for another state. 

All the licensing authority needs is documentation that proves your expertise and work experience. 

Benefit 3: Expanded work opportunities

Reciprocity also opens the door to new revenue opportunities. Plumbing companies can bid on regional commercial projects and expand into border markets, or respond to emergency service needs in neighboring states.

Additionally, during slow seasons, they can temporarily relocate crews to Sunbelt states (e.g., Texas, Florida, Arizona).

Benefit 4: Lower licensing costs

Plumbing reciprocity reduces onboarding costs for companies hiring out-of-state technicians. If the hiring company operates in a reciprocal state pairing, they can bring in already-licensed plumbers with fewer delays, meaning plumbers can start billable work much sooner.

Benefit 5: Easier multi-state business expansion

Companies that work in several states spend less time onboarding technicians. They can also hop on opportunities easily and without delay. 

For example, after Hurricane Harvey hit Houston in 2017, Texas needed thousands of extra plumbers for rebuilding. Plumbers from reciprocity states could get licensed and start working within weeks, while others were stuck in months-long application processes.

But, even with these benefits, contractors should be aware that reciprocity has limits.

Are There Restrictions on Plumbing License Reciprocity?

Yes, there are restrictions on reciprocity for plumbing licenses. Even states with reciprocity agreements impose limitations, such as: 

1. License levels: Some states restrict reciprocity to specific license levels. Common examples include offering reciprocity for journeyman plumbers but not for master plumbers. Others require additional exams, especially state-specific business or law tests.

2. Experience restrictions: Experience requirements may also differ. A state that requires 8,000 verified hours will not fully reciprocate with a state that only requires 4,000 hours, even if exam standards are similar. 

3. Licensing duration: Some states only allow reciprocity for applicants who have held their original license for a minimum period, often one to three years.

4. Special plumbing certificates: Reciprocity typically does not apply to specialty plumbing certifications such as gas fitting, medical gas installation, or backflow prevention. The only exception is a situation where the states have very closely matched training rules.

Because each state sets its own criteria, you must always confirm the exact requirements before beginning the transfer process.

Plumbing License Reciprocity by State

Plumbing reciprocity in the U.S. is limited. Only a few states have formal, active agreements that allow plumbers to transfer parts of their licensing credentials.

Below is the current breakdown of states that offer some form of plumbing license reciprocity today.

• Delaware: Delaware accepts plumbing contractor licenses from Connecticut, Iowa, and Maryland via reciprocity. The type of reciprocity depends on your license level. For example, if you hold a current master plumber license from one of these states, you may not need to submit any additional proof of experience.

Check out the full requirements here.

• Georgia: Georgia offers conditional reciprocity for out-of-state plumbing contractors. The board may waive certain exams for applicants who hold equivalent licenses from other states. But approval is not automatic, as the board evaluates each application individually to determine whether your home state's licensing requirements are comparable to Georgia's.

Learn more about the state’s requirements here.

• Idaho: Idaho has reciprocal agreements with Montana, Oregon, and Washington for plumbing contractors. It also recognizes journeyman plumbing credentials from some neighboring states. Keep in mind that reciprocity may apply differently depending on your license level.

View the state’s full licensing requirements.

• Maine: Maine may issue reciprocal licenses to out-of-state plumbers if the applicant's originating state has "substantially equivalent" licensing requirements.

Learn more about Maine’s licensing requirements here.

• Massachusetts: Massachusetts allows out-of-state plumbers to petition for a license based on "substantial equivalence" with Massachusetts standards. If approved, the board may waive certain exams and issue a reciprocal license.

View the full requirements here.

• Minnesota: Minnesota offers straightforward reciprocity for both journeyworkers and master plumbers. To qualify, you must hold a license that was obtained by examination — not just by endorsement or waiver — in either North Dakota or South Dakota. Plus, your license must be in good standing at the time of application.

Here are Minnesota’s full plumbing license requirements.

• Montana: Montana has formal reciprocal agreements with four states: Oregon, Idaho, North Dakota, and South Dakota. However, this reciprocity applies only to journeyman licensure; master plumber applicants from these states are not covered and must meet Montana's full licensing requirements.

We’ve covered the state’s full requirements here.

• New Hampshire: New Hampshire reciprocates with Vermont and Maine for plumbing licenses. To qualify, applicants must provide proof that they completed the required number of hours as specified by New Hampshire's licensing board.

Here are the full requirements.

• Oklahoma: Oklahoma reviews reciprocity applications on a case-by-case basis. When you apply, the Board will assess whether the state where you are currently licensed has licensing requirements, exams, codes, and continuing education standards that are substantially similar to Oklahoma's. Approval depends entirely on the Board's evaluation of your home state's standards.

Check out a more detailed breakdown of the requirements.

• South Carolina: South Carolina considers out-of-state plumbing license applications where the applicant's home state has equivalent licensing requirements. In some cases, exam waivers are available. But, as with most conditional reciprocity states, the board’s decision comes down to how closely your home state's standards align with South Carolina's.

More about South Carolina’s plumbing requirements here.

• South Dakota: South Dakota can grant a plumbing license without an examination, provided that the licensing requirements in your originating state are "substantially equivalent" to South Dakota's. This is one of the more straightforward reciprocity processes, though you will still need to submit documentation to verify your current license status and qualifications.

Learn more about South Dakota’s full requirements.

• Texas: Texas does not offer blanket reciprocity for plumbing contractors. Instead, it handles out-of-state applications on a case-by-case endorsement basis. Even if the technical or trade exam requirements are waived, you will typically still need to pass the Texas business and law exam, which covers Texas-specific statutes and regulations.

Learn about the requirements and regulations here.

• Vermont: Vermont's state statute allows the licensing board to issue plumber licenses without examination to applicants from states with equivalent licensing standards. While this provides a legal pathway for reciprocity, verification of your home state's requirements is still necessary.

Check out more about the state’s requirements here.

• Washington: Washington offers reciprocity with Idaho specifically for journey-level plumbers. Other license types or states are not covered under this agreement.

Here’s a detailed overview of the state’s plumbing license requirements.

Even though these states offer some sort of reciprocity, you still need to call or ask directly to confirm that you’re specifically eligible for plumbing license reciprocity.

Why Do Some States Not Offer Reciprocity for Plumbers?

Some states do not offer plumbing reciprocity primarily because plumbing codes and training requirements vary significantly across the country. 

• California has strict earthquake-resistant building codes and some of the toughest water-efficiency regulations in the country. Because of these unique requirements, plumbers must be specifically trained and licensed to work on California systems.

• Florida has some of the nation’s strictest hurricane-resistant building codes, which means plumbers must complete Florida-specific training to work safely and legally in the state.

• New York is complicated because NYC, Long Island, and upstate municipalities each enforce their own codes. This patchwork of rules makes it difficult to establish one consistent licensing or reciprocity agreement across the entire state.

There are some states that don’t offer reciprocity at all, such as Connecticut, Hawaii, Illinois, Indiana, Kansas, Michigan, Missouri, New Jersey, New York, Rhode Island, Wisconsin, and Pennsylvania.

Why don't these states participate? 

Some worry that plumbers from other states are not adequately trained. Or they want to protect local plumbers' jobs. Others align with labor unions, which sometimes oppose reciprocity to protect their members' jobs. 

Lastly, some states just have very different building codes or climate conditions that require special knowledge, which out-of-state plumbers are unlikely to have.

How Do State Plumbing License Requirements Differ?

Although all states aim to maintain plumbing safety, the specifics of plumbing licensure differ widely. 

Here are some differing license requirements for states:

• Work hours: Some states require you to have completed 4,000 hours (two years). Others prefer plumbers with 10,000 hours (five years) of work.

• Tests: Some states use national plumbing exams. Others, however—especially those in states with unique circumstances like earthquakes and tornadoes—create their own tests and exams.

• Training time: Required training ranges from one to four years.

• Background checks: Some states check everything, while others check just recent history.

• Money requirements: Bond requirements differ across states, ranging from $5,000 to $50,000.

These big differences explain why it's hard to transfer licenses between states.

What Are the Steps to Transfer a Plumbing License?

While every state has unique rules, the transfer process usually follows the same core steps:

• Step 1: Research the new state’s rules

• Step 2: Get your documents together

• Step 3: Complete all your forms

• Step 4: Take required tests

• Step 5: Finish getting your license

Let’s discuss these steps in detail:

Step 1: Research the new state's rules 

Go to the state licensing board's website and download its reciprocity application forms. Call the board directly to ensure you have the most up-to-date information. Also, check whether the city where you'll work has any additional requirements.

Step 2: Get your documents together 

Order an official copy of your current license, transcripts from any trade schools you attended, and letters that show your work hours. Make sure all your papers are recent.

Step 3: Complete all your forms

Complete all required forms, and don’t leave anything blank. Include passport photos if requested. Obtain a surety bond from a licensed and approved company. Get fingerprinted for the background check.

Step 4: Take required tests 

Sign up for any code or business law exams. Study the local changes to national codes. Plan for a 30- to 60-day wait for scheduling and results. 

Step 5: Finish getting your license 

Pay all fees. Register your business name to get local permits and business licenses. Update your insurance to meet state minimums.

Following these steps in order helps you avoid delays and problems with your application. After transferring your license, the next step is confirming that your license truly qualifies.

How Can I Check if My Plumbing License Qualifies for Reciprocity?

You can check if your plumbing license qualifies for reciprocity by contacting your new state’s licensing board and asking whether your current license and originating state qualify. 

Start with the official source, which is the state licensing board where you want to work. Don't trust third-party websites or forums that say 'State X has reciprocity with State Y.' These are often outdated or oversimplified. 

When you call the licensing board, be specific about your situation. Don't just ask, “Do you have reciprocity?” 

Instead, say: 

“I'm a master plumber licensed in Georgia for eight years. I have 15 years of total experience. What are my options for getting licensed in your state?”

The answer might be different for a journeyman with two years of experience.

Ask these specific questions:

• Does your state have reciprocity with my state?

• Does it apply to my license level (apprentice, journeyman, master)?

• What documentation will I need from my current state?

• What exams will I still need to take?

• What's the total cost, including all fees?

• How long does the process typically take?

• Are there any pending changes to reciprocity rules?

Get everything in writing when possible. Some boards will email you requirements or direct you to specific forms. Save these emails, as requirements can change and you may need proof of what you were told.

Check with professional associations, too, such as the Plumbing-Heating-Cooling Contractors. These associations often have resources about interstate licensing. They might know about upcoming changes or have tips from other members who have gone through the process.

What Are Common Mistakes in Plumbing License Transfers?

License transfers often fail because plumbers make these mistakes:

• Assuming reciprocity equals instant approval

• Not requesting license verification early

• Missing local registration requirements

• Overlooking exam requirements

Mistake 1: Assuming reciprocity equals instant approval

One of the most frequent mistakes is assuming reciprocity means automatic approval, which leads some plumbers to begin work prematurely or skip steps in the application process. You still need to apply, pay, and meet all requirements.

Mistake 2: Not requesting license verification early

Others fail to request license verification early enough, causing the entire transfer to stall. Some states take two to four weeks to send verification, delaying the entire process.

Mistake 3: Missing local registration requirements

Missing local or county-level registrations is another common issue, particularly in states where licensing is decentralized. Even with a state license, some cities require their own permits.

Mistake 4: Overlooking exam requirements

Finally, some plumbers overlook state-specific exam requirements, especially business and law exams, which can delay licensing by several weeks if not completed promptly. Business law exams are commonly required even when the trade exam is waived.

Grow Your Plumbing Business Across State Lines with ServiceTitan

While plumbing license reciprocity will enable multi-state business expansion, it’s just the tip of the iceberg. 

Expanding a plumbing business into new states requires strong operational systems. Staying compliant with licensing rules, technician assignments, documentation, and scheduling can be overwhelming for teams without the right tools and resources. 

ServiceTitan is designed to support multi-state plumbing companies with the structure, visibility, and control needed to operate efficiently across multiple states.

Here’s how:

• ServiceTitan’s Enterprise Hub is particularly valuable for businesses operating in multiple states. It centralizes your operations so you can manage teams, reporting, resources, and workflows from a single dashboard.

If you run locations in both Georgia and South Carolina, for example, Enterprise Hub allows you to compare performance metrics, standardize job types, and control access across regions with ease.

• The Dispatch Board enables accurate job assignment based on technician availability, skill sets, license level, and legal service territory. This mostly applies when managing technicians who work near state borders. 

ServiceTitan ensures dispatchers do not accidentally assign a tech to work in a state where they’re not licensed, reducing compliance risks and maintaining smooth operations.

• With Maps 2.0, managers and dispatchers get a real-time view of job locations, so they can figure out the best routes for technicians. 

This helps optimize routes, minimize travel time, and ensure technicians operating in multiple states remain compliant with local licensing rules. 

• Adaptive Capacity Planning helps multi-state businesses anticipate demand variations between regions, allocate labor more effectively, and shift technicians as needed, particularly during seasonal peaks or expansions into new markets. 

This tool provides you with the insight to staff correctly and maintain high service quality even as your business grows.

Together, these tools allow plumbing companies to scale confidently, stay compliant, improve efficiency, and deliver consistent service across multiple states.

Over to You!

Getting your plumbing license recognized in other states opens up new opportunities for more work and better profits. Whether you're following storm recovery work, chasing big commercial projects, or just expanding your service area, understanding reciprocity gives you an edge.

Remember that success in new states means learning local codes, finding good suppliers, and building your reputation from scratch. Get your paperwork right, and always double-check current rules with state boards.

ServiceTitan is the top software for plumbing business operations, giving contractors the tools they need to run profitable businesses in any state. Want to see how ServiceTitan can help your plumbing business? Book a demo now.