Arizona · Updated September 2026
Verify a Flagstaff plumber's Arizona license in two minutes
Plumbing work in Arizona requires a Registrar of Contractors (ROC) license in class CR-37, R-37R, or C-37. Search any company by name or ROC number at the state's own Contractor Search — free, no account — and confirm the status reads Active before you hire. Here is exactly how, and what each result means.
Serving Flagstaff, Arizona.
The ROC number belongs on the estimate. If it is not there, ask — then look it up yourself.
Step by step
The lookup
- 1
Get the exact business name or ROC number
Ask the company for its ROC license number — Arizona contractors are required to include it in advertising, so it should be on the truck, the estimate, and the website. If you only have a name, use the legal or DBA name exactly as it appears on the estimate.
- 2
Open the Arizona ROC Contractor Search
Go to https://azroc.my.site.com/AZRoc/s/contractor-search — the Registrar of Contractors' official public lookup. It is free and needs no account. Do not rely on a third-party "license check" site; go to the state's own database.
- 3
Search by license number or business name
Enter the ROC number (fastest and unambiguous) or the business name. If several results appear, match the mailing city and the qualifying party name to what is on your estimate.
- 4
Check status, class, and dates
The record shows the license status (you want "Active"), the classification, the issue date, and any complaints or disciplinary history. For plumbing, the classification should be CR-37, R-37R, or C-37. "Suspended," "Expired," "Cancelled," or "Inactive" means the company cannot legally contract for licensed work today.
- 5
Match the class to your job and the name to your contract
R-37R covers residential only; C-37 covers commercial only; CR-37 covers both. A residential-only licensee cannot legally take a commercial job and vice versa. Finally, make sure the name on the license is the name on your contract — a license held by a different entity than the one you are paying does not protect you.
Classifications
What CR-37, R-37R, and C-37 mean
| Class | Scope | Who usually holds it |
|---|---|---|
| CR-37 | Plumbing — residential and commercial (dual) | Most full-service plumbing companies |
| R-37R | Plumbing — residential only | Home-service plumbers, smaller shops |
| C-37 | Plumbing — commercial only | Commercial / new-construction contractors |
A separate pair — R-37 / C-37 "Plumbing, Including Solar" and CR-77 — covers solar water heating scope. Don't confuse it with the base plumbing class when you read a record. Septic tank work is a different classification entirely (R-41 / C-41 / CR-41), and septic pumping is licensed by ADEQ, not ROC — so a pumping-only company legitimately won't appear in an ROC search.
The classification matters for two reasons. First, scope: an R-37R licensee cannot legally take a commercial job. Second, it is the quickest way to spot a company advertising plumbing on a license that is actually for something else — a general contractor's license, for example, does not cover plumbing as a trade.
The $1,000 exemption
When unlicensed work is legal in Arizona — and why it rarely applies to plumbing
Arizona law (A.R.S. §32-1121, paragraph A.14) lets an unlicensed person do work when all three of these are true: the entire job — labor and materials — is under $1,000; the work does not require a local building permit; and the person discloses "not a licensed contractor" in any advertising. Splitting one job into several under-$1,000 invoices to dodge the threshold is specifically prohibited.
For plumbing, the permit condition is the one that bites. Replacing a water heater requires a permit in Flagstaff, so a water heater swap is never exempt at any price. Gas line work, sewer repair, and repipes need permits too. A single drain clear under $1,000 could legally be done unlicensed — but that person has no ROC oversight, no bond, and you have no access to the Recovery Fund if something goes wrong. Advertising the ability to do licensed work without a license is a class 1 misdemeanor in Arizona (A.R.S. §32-1165), which is also why this site never describes itself as the plumber.
Related: what licensed plumbing work actually costs in Flagstaff, and the permit note on the water heater page.
Red flags
Walk away if you see these
- No ROC number anywhere — not on the truck, website, or estimate. Arizona requires it in advertising.
- The lookup says anything but Active. Suspended, expired, cancelled, or inactive all mean the company cannot legally contract for the work today.
- The name on the license isn't the name on the contract. A license held by a different entity does not cover you.
- "No permit needed" for a water heater, gas line, or sewer repair. It is needed. A bidder skipping it is either uninformed or planning to.
- Cash-only, full payment up front, or pressure to sign today. None is illegal on its own; together they are the pattern the ROC's complaint files are full of.
- A quote with no scope. "Water heater — $1,800" tells you nothing. A real estimate lists the unit, the code items, the permit, and what happens to the old tank.
On this site: Companies we pass requests to report holding an active Arizona ROC license (class CR-37, R-37R, or C-37) and insurance. Verify any contractor yourself at azroc.my.site.com before hiring.
-
Prices published, not hidden
Every cost range on this site names its source and how local that source is.
-
Flagstaff only
Written for a single Arizona high-country market, not a generic statewide page.
-
Check the license yourself
Arizona plumbing work needs an ROC class CR-37, R-37R, or C-37 license. Look any company up at azroc.my.site.com.
-
One request, one company
Tell us the job once and it goes to one independent Arizona plumbing company serving Flagstaff.
Common questions
How do I check if a plumber is licensed in Arizona?
Search the Arizona Registrar of Contractors' official Contractor Search at https://azroc.my.site.com/AZRoc/s/contractor-search by ROC license number or business name. A legitimately licensed plumber shows status "Active" and a plumbing classification — CR-37 (residential and commercial), R-37R (residential only), or C-37 (commercial only). The lookup is free and takes about two minutes.
What license does a plumber need in Arizona?
An Arizona Registrar of Contractors (ROC) license in a plumbing classification: CR-37 for dual residential and commercial work, R-37R for residential only, or C-37 for commercial only. Most service plumbers who work on homes hold CR-37 or R-37R. Arizona has no separate state plumber's card the way some states do — the ROC contractor license is the credential.
Does a small plumbing repair need a licensed contractor?
Usually yes. Arizona's exemption for unlicensed work (A.R.S. §32-1121(A)(14)) applies only when the whole job — labor and materials — is under $1,000, no building permit is required, and the person discloses "not a licensed contractor" in any advertising. A water heater swap needs a permit, so it is never exempt regardless of price. A single drain clear under $1,000 could qualify, but the unlicensed person has no ROC oversight, no bond, and you have no Recovery Fund protection if it goes wrong.
What is the ROC Residential Contractors’ Recovery Fund?
A state fund, administered by the Arizona ROC, that can reimburse an owner-occupant of a residence for actual damages caused by a licensed residential contractor who does not complete or correct the work, after the ROC process runs its course. It applies only when the contractor was licensed — which is the practical reason to verify before you hire. Payout limits and eligibility details are on roc.az.gov/recovery-fund; check them there, since they change.
Get a quote
Get matched with a licensed Flagstaff plumber
Describe the job and one request goes to an independent, Arizona-licensed plumbing company serving Flagstaff. Then run their ROC number through the steps above before work starts.
- Typical responseSame day
- Cost to you$0
- Service areaFlagstaff, AZ