How do I verify a plumber's license in Arizona?

Go to the ROC's free public license search at roc.az.gov/search. The Arizona Registrar of Contractors is the state agency that licenses and regulates contractors, and its database is open to anyone at no cost. You do not need an account, and you do not pay a fee.

The search box accepts three different inputs, so you can find a contractor even with limited information:

• License number if it appears on a quote, business card, truck, or website.
• Business name as the company is registered, which may differ slightly from its everyday brand name.
• Qualifying-party name, meaning the individual who took the trade exam and holds the license on the company's behalf.

If a search by business name comes up empty, try the owner's or qualifying party's name. Some companies operate under a "doing business as" name that is different from the legal entity on file. A plumber who cannot or will not give you a license number to check is itself a warning sign worth taking seriously.

The qualifying party is worth understanding. Arizona does not license companies on faith; it licenses them because a named person passed the trade and business exams and agreed to be responsible for the company's work. That person is the qualifying party. When you search by their name, you can see every license they stand behind, which helps when a one-person shop operates under a brand name that is hard to pin down. If the qualifying party recently left the company, the license can lapse, so the name on the record should still be the person running the jobs.

Pulling up a record is only step one. The detail page carries the information that actually protects you, so work through this checklist before you sign:

1. 1Status is Active. The license must read Active, not suspended, revoked, expired, or inactive. A lapsed or disciplined license means the contractor is not authorized to do the work.
2. 2The classification matches your job. Arizona licenses are issued by trade. Plumbing work falls under C-37 (commercial), R-37 (residential), or CR-37 (dual). Sewer, drain, and pipe-laying work, including connections that run into a public easement or right-of-way, falls under A-12 (Sewers, Drains, and Pipe Laying). A residential plumbing license does not by itself cover a sewer line replacement in the street.
3. 3The bond is active. Licensed contractors carry a license bond, and the record shows whether it is current. The bond is a financial backstop if the contractor fails to perform.
4. 4The expiration date. Licenses renew on a cycle. Check that the license will still be valid through the period when your work happens.
5. 5Complaint history. The record lists complaints filed against the license and how they were resolved. A pattern of unresolved or repeated complaints is a reason to keep looking.

Match the classification to the work in front of you. For a faucet or water heater you want plumbing; for a collapsed sewer pipe heading toward the alley you want A-12. Our page on the difference between a utility easement and a right-of-way explains why that A-12 distinction matters for any pipe leaving your property line.

The single biggest reason is the Residential Contractors' Recovery Fund, created under Arizona law to protect homeowners. If a licensed residential contractor damages your property or fails to perform, you can file a claim and be reimbursed up to $30,000 per claimant. A.R.S. 32-1132.01 describes the Fund's purpose plainly:

"The residential contractors' recovery fund is established to be used solely as provided in this section."

The catch is in the word licensed. The Fund exists for damage caused by a contractor the state actually licensed and regulates. Hire someone unlicensed, and that door is closed. You would be left to chase the person through civil court on your own, often with little to show for it. That is the practical price of skipping the two-minute search.

Licensing also ties directly to bonding and insurance. To hold a license, a contractor posts a license bond, which under A.R.S. 32-1132 ranges from $4,250 to $100,000 depending on the license class and dollar volume of work. Residential contractors must either pay into the Recovery Fund or post a separate, larger bond. None of that protection follows an unlicensed handyman. A licensed, bonded plumber has put money and a state-issued credential on the line; an unlicensed one has put nothing on the line but your trust.

A clean license record also signals stability. The trade exam, the bond, the renewals, and the complaint process all create a paper trail the contractor has to maintain. That track record is hard to fake and easy for you to read.

There is also a quieter benefit to hiring licensed. When a job needs a permit and an inspection, a licensed contractor is the one allowed to pull it and stand behind the work. An unlicensed person who skips the permit can leave you with code violations that surface years later when you sell the home. The license you verified at the start is the same credential that keeps the rest of the job legitimate.

Here is the whole process from start to finish, the way we would do it ourselves before trusting a sub:

1. 1Open the search. Visit roc.az.gov/search on any phone or computer.
2. 2Enter what you have. Type the license number if you have it; otherwise enter the business name or the qualifying-party name.
3. 3Open the matching record. Click the result that matches the company you are hiring. Confirm the spelling and address line up with the quote you received.
4. 4Read the status. Verify it says Active. Stop here if it says anything else and ask the contractor to explain before you go further.
5. 5Check the classification. Confirm the license class (C-37, R-37, CR-37, or A-12) covers the work you need done.
6. 6Confirm the bond and expiration. Make sure the bond is current and the license will not expire mid-project.
7. 7Review complaints. Read any complaint entries and their outcomes. Weigh resolved single complaints differently from a repeated pattern.
8. 8Save a screenshot. Keep a dated copy of the record with your project file in case a question comes up later.

Run this check before you sign a contract or pay a deposit, not after. Once money has changed hands with an unlicensed party, your options shrink fast. A few minutes up front is the cheapest insurance you will ever buy on a plumbing job.

Treat reluctance as an answer. A legitimate Arizona plumbing contractor expects to be checked and will hand over a license number without hesitation. Vague replies, "we work under someone else's license," or pressure to skip the paperwork all point toward an unlicensed operator and the loss of every protection above.

You can still find many contractors by business name alone, so a missing number is not the end of the search. But it changes the tone of the conversation. Pair the license check with proof of current liability insurance and, for any job touching gas or a sewer line in the right-of-way, the matching classification. Our guides on why hiring a licensed, bonded, and insured plumber matters and how to choose a plumber walk through the rest of the vetting, from written estimates to warranties.

A license search will not tell you whether a plumber is friendly or fast. It will tell you whether the state stands behind them and whether the Recovery Fund stands behind you. For a job that can run into the thousands and involves water inside your walls, that is the floor you should never skip.