How to Become a Plumber in Wisconsin

Most people who ask about getting licensed in Wisconsin are surprised by how long the process actually takes. The state runs one of the more structured plumbing credential systems in the country, with mandatory apprenticeship contracts, state-administered exams, and a clear hierarchy that separates individual trade licenses from business-level registrations.

The Three-Tier Credential Ladder

Wisconsin plumbing credentials follow a fixed progression managed by the Department of Safety and Professional Services (DSPS) under Chapter 145 and Administrative Code SPS 305. The path runs through three tiers:

Registered Plumbing Apprentice → Licensed Journeyman Plumber → Licensed Master Plumber

For the standard unrestricted path, each tier builds on the previous one, and the hours and education requirements at each stage are non-negotiable. Restricted and other specialized credentials provide alternative entry points; an engineering degree is an alternative pathway to the master exam that bypasses the journeyman requirement.

Step 1: Register as a Plumbing Apprentice

Before you touch a pipe on a job site, you need two things: employment with a licensed plumbing contractor and a formal apprenticeship contract through the Department of Workforce Development (DWD) Bureau of Apprenticeship Standards.

Registration with DSPS costs $15. Your apprenticeship contract must comply with Wisconsin Statute Chapter 106, and your employer must be a registered plumbing contractor with a designated Responsible Master Plumber on file.

The standard apprenticeship runs five years and requires 7,428 hours of on-the-job training plus 572 hours of classroom instruction. While in the field, you must work under the direct, on-site supervision of a licensed journeyman or master plumber — there is no remote supervision at this level.

Step 2: Pass the Journeyman Exam

Once you complete your apprenticeship contract, you're eligible to apply for the journeyman exam through DSPS. The application fee is $10, plus a $20 exam fee (or approximately $180 if you schedule through Pearson VUE, the state's testing vendor).

The exam is a two-part, open-book test with 87 questions in Part 1 and 120 questions in Part 2. Each part has a three-hour time limit and a 70% passing threshold. Testing centers are located in Eau Claire, Madison, Brookfield, and Kenosha — out-of-state centers cannot administer Wisconsin plumbing exams.

After passing, you'll pay a $180 licensing fee to receive your credential. As a licensed journeyman, you can perform installations and repairs under the general supervision of a master plumber. General supervision means the master doesn't need to be physically on-site, but they take responsibility for code compliance.

Step 3: Advance to Master Plumber

The master plumber credential requires at least three consecutive years of post-journeyman experience, with a minimum of 1,000 documented hours per year. DSPS reviews this documentation carefully — hours from before your journeyman license date or accumulated under an unregistered status are rejected.

The master exam is an eight-hour, two-part open-book test: 110 questions in Part 1 and 132 in Part 2, each with a four-hour limit. Fees include a $20 application fee, a $30 exam fee (or approximately $190 via Pearson VUE), and a $500 license fee upon passing.

A master plumber can plan, design, and install plumbing systems, pull permits, and supervise journeymen and apprentices. But the master license alone does not authorize you to run a plumbing business — that requires a separate Plumbing Contractor Registration.

The Engineering Shortcut

Wisconsin offers one alternative path to the master exam. Under SPS 305.91(3)(b), holders of a Bachelor's or Master's degree in civil engineering, mechanical engineering, or an approved plumbing-related engineering curriculum can sit for the master exam without holding a journeyman license or documenting field hours. This pathway exists because engineering graduates have already demonstrated technical competency through their degree program.

What Comes After the Master License

Getting your master license is not the finish line if you want to run your own shop. You'll need to form a business entity with the Department of Financial Institutions, secure liability insurance or a surety bond, and apply for a Plumbing Contractor Registration through DSPS — designating yourself as the Responsible Master Plumber. Without that registration, contracting for plumbing work is a violation of Wisconsin Statute Section 145.17.

Both the journeyman and master licenses renew every four years on March 31, requiring 24 hours of DSPS-approved continuing education per cycle.

The Wisconsin Plumber License Guide walks through every step of this process — from apprentice registration through contractor setup — with the exact forms, fees, and filing sequences you need to get it right the first time.

See more Wisconsin guides →