Do you need a license to work as a plumber in Arizona?

Yes. In Arizona, a contractor doing plumbing needs a contractor license from the registrar of contractors in a plumbing classification. Under the registrar’s rules, the R-37 residential classification covers water and gas piping, water sprinkler fire protection and sewage treatment systems, and C-37 covers commercial plumbing. This is A.R.S. §§ 32-1151, 32-1101; Ariz. Admin. Code R4-9-102, R4-9-103.

WhatArizona
Plumber licenseContractor license, plumbing class (registrar)

Source

A.R.S. §§ 32-1151, 32-1101; Ariz. Admin. Code R4-9-102, R4-9-103

Read the statute in the Arizona Revised Statutes (Arizona Legislature): azleg.gov.

The linked sections open Justia’s free copy of the code, because the state’s own site has no stable address for each section.

Checked against the statute on November 13, 2026.

This is a summary of a published statute, not legal advice. Rules change, local ordinances can add to them, and the terms of a specific lease may differ. Check the citation and speak to a lawyer before acting.

How Seayora uses this rule

A contractor on Seayora keeps each license with its issuing state, its expiry date and the last four digits of its number, and the business is warned before one lapses — on the website and both phone apps. A customer finding a pro on Seayora sees whether a license is on file.

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