Wisconsin Master Plumber License Requirements (2026)

The Wisconsin Department of Safety and Professional Services (DSPS) licenses plumbers statewide under Wis. Stat. Chapter 145 and Wis. Admin. Code SPS 305. Wisconsin uses a strict tiered path: Plumbing Apprentice (registered for a five-year, 7,500-hour apprenticeship under a Wisconsin Master Plumber) → Journeyman Plumber (after the apprenticeship and the Journeyman Plumber examination) → Master Plumber (after at least two years of journey-level experience and the Master Plumber examination). Wisconsin enforces its own Wisconsin Plumbing Code (SPS 382 – 387), not the IPC or UPC, which makes Wisconsin one of only a handful of states with a fully independent plumbing code. PSI Services administers the proctored examinations under contract to DSPS.

Governing Authority

This license is issued and enforced by Wisconsin Department of Safety and Professional Services (DSPS) pursuant to Wis. Stat. Chapter 101 (Department of Safety and Professional Services); Wis. Admin. Code SPS chapters covering electrical, plumbing, HVAC, and dwelling contractors. DSPS administers credentialing for construction trades in Wisconsin, adopts and enforces the Wisconsin Uniform Dwelling Code, Wisconsin Electrical Code, and Wisconsin Plumbing Code, and conducts disciplinary proceedings against credential holders.

Official portal: https://dsps.wi.gov/Pages/Professions/Default.aspx
Address: 4822 Madison Yards Way, Madison, WI 53705
Phone: (608) 266-2112

Eligibility Requirements

An applicant qualifies only after meeting the age floor of 18 and producing a valid Social Security Number. No Wisconsin residency requirement.

Good moral character

DSPS conducts a fitness review on every applicant. Felony convictions substantially related to the practice of plumbing are reviewed individually.

Background investigation

Mandatory criminal history disclosure on the application.

Experience & Education Matrix

Eligibility requires 7 years of a five-year (7,500-hour) registered plumbing apprenticeship under a Wisconsin Master Plumber to qualify for the Journeyman examination, plus at least two years of journey-level experience to qualify for the Master Plumber examination, documented and independently verifiable. Payroll, tax, project, and supervisor records are the usual proof the board will accept.

Accepted proof of experience or eligibility

Registered Wisconsin plumbing apprenticeship completion certificate
DSPS Experience Verification Form signed by each Wisconsin Master Plumber supervisor
W-2 statements, pay stubs, or 1099 records covering the qualifying period
College transcripts for any claimed education substitution

Education substitution

Accredited plumbing technology coursework may substitute for a limited portion of the apprenticeship hours under DSPS rule, but the registered apprenticeship is the standard path.

Examination Structure

PSI Services LLC (under contract to DSPS) runs the examination for this credential. Issuance is contingent on passing every part below:

Wisconsin Master Plumber Examination — Wisconsin Plumbing Code (SPS 382–387), plumbing theory, isometric drawings, business and law — 100 questions, 300 minutes, passing score 70%

Examination fee: $100 examination fee paid to PSI on the day of testing.

Retake policy: Failed examinations may be retaken by paying a new $100 fee. Each application remains valid for one year from the date of approval.

Insurance & Financial Security

The cited state source set does not require a contractor license surety bond for this credential. Contractors should still confirm project-specific bond, permit-bond, or public-works bond requirements before bidding.

General liability

DSPS does not impose a state-level general liability minimum on the Master Plumber credential. Most municipalities and commercial owners contractually require $1,000,000/$2,000,000.

Workers' compensation

Workers' compensation insurance is mandatory under Wis. Stat. Chapter 102 for any construction business with at least one employee.

Additional financial requirements

No financial statement is required for the Master Plumber credential.

Application and License Fees

Fee	Amount
Application (non-refundable)	$100
Examination	$100
Initial license	$100
Renewal (every 2 years)	$100

Maintenance & Renewal

Expect to renew the Wisconsin Master Plumber every 2 years. Renewal currently costs $100. Wisconsin Master Plumber credentials renew every two years.

Continuing education: Twelve hours of DSPS-approved continuing education on the Wisconsin Plumbing Code each two-year renewal cycle.

Downloadable Asset

2026 Wisconsin Plumber License Roadmap (PDF) — a printable step-by-step checklist for the application process.

Download the PDF roadmap →

Reciprocity and Endorsement

Wisconsin does not accept the NASCLA Accredited Examination for this classification.

Reciprocal State	Accepted Exam	Conditions
Minnesota	Trade exam waived	Bilateral DSPS–Minnesota DLI master plumber reciprocity for active master plumbers in good standing.
Iowa	Trade exam waived	Bilateral reciprocity with the Iowa Plumbing and Mechanical Systems Board for active master plumbers.
Michigan	Limited recognition	Limited recognition with Michigan LARA Plumbing Board where Michigan accepts Wisconsin master plumbers in return.

Reciprocal applicants must still pass a Wisconsin Plumbing Code supplement because Wisconsin uses its own plumbing code rather than the IPC or UPC.

Weighing more than one jurisdiction? The national hub compares Plumber license requirements in every state — exam, bond, fee, and experience thresholds side by side.

Step-by-Step Application Roadmap

Register as a Plumbing Apprentice. Enroll with DSPS as a plumbing apprentice and begin a five-year registered apprenticeship under a Wisconsin Master Plumber.
Complete the 7,500-hour apprenticeship. Log all 7,500 hours of supervised experience over five years and complete the related classroom instruction.
Pass the Wisconsin Journeyman Plumber examination. Score 70% or better on the PSI Journeyman Plumber exam covering the Wisconsin Plumbing Code and plumbing theory.
Document two years of journey-level experience. Work at least two years as a Wisconsin Journeyman Plumber under a Master Plumber.
Submit the DSPS Master Plumber application. File the DSPS application with experience verification, fee, and exam scheduling request.
Pass the PSI Master Plumber examination at 70%. Score 70% or better on the 100-question exam covering the Wisconsin Plumbing Code (SPS 382–387), isometric drawings, theory, and business and law.
Receive the Master Plumber credential. DSPS issues the credential after the exam is passed. The credential must be renewed every two years.

Pre-Submission Checklist

These are the pieces to lock down before filing with DSPS:

☐ Wisconsin Plumbing Apprentice registration
☐ Five-year (7,500-hour) registered apprenticeship completion certificate
☐ PSI Wisconsin Journeyman Plumber exam pass certificate
☐ Two years of documented journey-level experience under a Wisconsin Master Plumber
☐ DSPS Master Plumber application with $100 fee
☐ PSI Wisconsin Master Plumber exam pass certificate at 70%+
☐ Workers compensation certificate for any business with employees

Study and Reference Materials

These are the preparation and reference materials tied to this credential — cited by the regulator or widely used by applicants. CLR earns nothing from listing them.

Wisconsin Plumbing Code SPS 382 – 387 — Wisconsin DSPS. Primary technical reference. Required reading for both the Journeyman and Master examinations.
Wisconsin Master Plumber Exam Prep — DSPS-approved continuing education providers. Course textbooks vary by provider but all cover the Wisconsin code, isometric drawings, and theory.
Wis. Stat. Chapter 145 and SPS 305 — State of Wisconsin. Plumbing licensing law and rules.

Common Filing Mistakes

Working from the cited board instructions, here are the snags most likely to trip up a Wisconsin Plumber filing.

Studying the IPC or UPC instead of the Wisconsin Plumbing Code

Wisconsin uses its own plumbing code. Applicants who study the IPC or UPC routinely fail the exam because the venting, sizing, and isometric requirements differ.

Skipping the registered apprenticeship

Wisconsin requires a registered five-year apprenticeship. There is no shortcut for journeyman plumbers from non-registered programs.

Underestimating the isometric portion

The Master exam includes isometric drawings of complete plumbing systems. This is the most-failed section for first-time test takers.

Missing continuing education

Twelve hours of DSPS-approved CE each two-year cycle is mandatory. Missing CE blocks renewal.

Letting the credential lapse

A lapsed Master Plumber credential cannot supervise apprentices and cannot serve as the responsible individual for any plumbing contracting business.

Other Wisconsin Trade Licenses

If the Plumber license is not the right fit, the following published Wisconsin trade guides are also covered by CLR:

Frequently Asked Questions

How long does it take to become a Master Plumber in Wisconsin?

A minimum of seven years: five years (7,500 hours) of registered apprenticeship to reach the Journeyman credential, plus two years of journey-level experience to qualify for the Master examination.

Does Wisconsin use the IPC or the UPC?

Neither. Wisconsin enforces its own Wisconsin Plumbing Code (SPS 382 – 387). Applicants from IPC or UPC states must learn the Wisconsin code before sitting for the exam.

Can I substitute classroom education for the plumbing apprenticeship?

Only a limited portion. The registered five-year apprenticeship is the standard path. DSPS allows accredited plumbing technology coursework to substitute for some hours but not for the apprenticeship as a whole.

Does Wisconsin reciprocate plumbing credentials?

Yes, with Minnesota and Iowa, and limited recognition with Michigan. Reciprocal applicants must still pass a Wisconsin Plumbing Code supplement.

How often does the Wisconsin Master Plumber credential renew?

Every two years. Renewal requires twelve hours of DSPS-approved continuing education.

Primary Sources

Regulatory requirements on this page are drawn from the official board, statute, and exam-provider materials listed below.

Verified 2026-05-19 · Next scheduled review 2026-08-17