How Do You Get a Plumbing License in Wisconsin?

Yes.

Wisconsin requires a license to engage in or work at plumbing anywhere in the state, issued by DSPS, and the duty reaches apprentices and pipelayers, who must be registered.

Licenses are issued only to individuals — never to a firm or corporation — and there is no separate plumbing contractor license on top of them: plumbing may be installed only with a licensed master plumber in charge, who is responsible for proper installation.

Wisconsin's ladder has three main rungs.

A plumbing apprentice must be registered before working, and registration requires being entered into a plumbing apprentice contract recognized under Wis.

Stat. ch. 106; apprentices install plumbing under the general supervision of a licensed master plumber.

A journeyman plumber has passed the journeyman exam, for which completing a ch. 106-recognized apprenticeship is the eligibility gate; journeymen work under the general supervision of a master plumber, a Master Plumber-Restricted, or a utility contractor.

A master plumber tops the ladder: the master exam requires at least 1,000 hours of plumbing-related work experience per year for at least 3 years as a licensed journeyman plumber, or an approved engineering degree.

Wisconsin also issues restricted credentials alongside the main ladder — Master Plumber-Restricted, Journeyman Plumber-Restricted Service, Journeyman Plumber-Restricted Appliance, Plumbing Learners, Utility Contractor, Pipelayer and Cross Connection Control Assembly Tester.

On the business side, a company may advertise as a plumbing contractor or plumber only if it is or employs a licensed master plumber, and a master may not lend a license to others to pull permits.

Apprentice registration is the entry point: to register, you must be entered into a plumbing apprentice contract recognized under Wis.

Stat. ch. 106, and Wisconsin's DWD Bureau of Apprenticeship Standards — the state's apprenticeship agency — sets supervision standards for plumbing apprentices beyond DSPS's own rules.

The journeyman exam gate is a completed ch. 106 apprenticeship; our research did not record how long that apprenticeship runs, so ask the program and DSPS.

The master exam requires at least 1,000 hours of plumbing-related work experience per year for at least 3 years as a licensed journeyman plumber, or an approved engineering degree.

DSPS license fees were not captured in our research; confirm current fees with the department before you apply.

Two exams gate this ladder, both part of DSPS licensing.

The journeyman plumber exam is open to people who have completed a plumbing apprenticeship program recognized under ch. 106.

The master plumber exam requires at least 1,000 hours of plumbing-related work experience per year for at least 3 years as a licensed journeyman plumber, or an approved engineering degree.

Our research did not identify who administers the exams or what a content outline covers, so confirm the vendor, the booking steps and the current exam content with DSPS before you schedule.

Journeymen and masters need continuing education: renewal is contingent on obtaining at least 24 hours of acceptable CE.

The plumbing apprentice registration carries no CE requirement — renewing it instead means attesting to an active ch. 106 apprentice contract.

Our research did not capture the renewal cycle length or the renewal fees for Wisconsin plumbing credentials, so confirm both with DSPS before your renewal comes due.

The comity path our research found sits in Wisconsin's statutes, and it leads to the journeyman exam: the statute accepts people who completed an apprenticeship in any state, passed another state's journeyman exam, and have practiced for at least 5 years under a journeyman plumber's license or equivalent license issued by another state.

Comity is exam eligibility — it admits you to the journeyman exam; it is not itself a Wisconsin license.

We did not find a straight license-transfer path, nor an equivalent comity provision for the master exam, so if you hold a master-level license elsewhere, ask DSPS how your experience is treated.

DSPS licenses plumbers statewide, and the credential lookup our research recorded for Wisconsin is DSPS's LicensE credential lookup on dsps.wi.gov.

We did not capture the lookup's direct web address or confirm its search options, so start at the DSPS site — linked in the resources on this page — and follow the LicensE credential lookup from there.

Check a license before you hire a contractor, and before you take a job with a shop that claims licensed status.

The plumbing credentials our research found in Wisconsin run from apprentice to master plus the restricted list, and one of them is the Cross Connection Control Assembly Tester — the backflow tester credential our research recorded for Wisconsin.

We did not find a separate gas-fitter license in that list.

If you will work on gas piping or backflow devices, ask DSPS which credential covers that work and what it allows before you take it.