100+ Free WI Plumber Practice Questions

Pass your Wisconsin Journeyman Plumber License Exam exam on the first try — instant access, no signup required.

✓ No registration✓ No credit card✓ No hidden fees✓ Start practicing immediately

~50-60% Pass Rate

100+ Questions

100% Free

1 / 100

Question 1

Score: 0/0

Which agency oversees plumber licensing in Wisconsin?

Wisconsin Department of Commerce

Wisconsin Department of Safety and Professional Services (DSPS)

Wisconsin Department of Natural Resources

Wisconsin Department of Workforce Development

to track

Same family resources

More Plumber License Prep

Continue through related practice pages, study guides, comparisons, and articles from the same exam family.

Practice Pages

Alabama Journeyman Plumber Practice100 questions Alaska Journeyman Plumber Practice100 questions Arizona Journeyman Plumber Practice100 questions Arkansas Journeyman Plumber Practice100 questions California Journeyman Plumber Practice100 questions Colorado Journeyman Plumber Practice100 questions

Free Journeyman Plumber Practice Test by State 2026: 4,700+ Questions24 min read

2026 Statistics

Key Facts: WI Plumber Exam

70%

Passing Score

Wisconsin DSPS

~100

Exam Questions

PSI exam format

3 hrs

Time Limit

PSI

SPS 381-387

Code Base

Wisconsin State Plumbing Code

The Wisconsin journeyman plumber exam is administered through PSI and overseen by DSPS. The exam has approximately 100 questions with a 3-hour time limit, requiring 70% to pass. Wisconsin uses its own state-specific plumbing code (SPS 381-387, formerly Comm 81-87) — NOT the IPC or UPC. Key Wisconsin-specific topics include frost closure vent requirements, POWTS regulations, and the statewide cross-connection control program.

Sample WI Plumber Practice Questions

Try these sample questions to test your WI Plumber exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which agency oversees plumber licensing in Wisconsin?

A.Wisconsin Department of Commerce

B.Wisconsin Department of Safety and Professional Services (DSPS)

C.Wisconsin Department of Natural Resources

D.Wisconsin Department of Workforce Development

Explanation: The Wisconsin Department of Safety and Professional Services (DSPS) oversees plumber licensing. DSPS administers the licensing program, processes applications, and enforces the state plumbing code.

2Wisconsin's plumbing code is based on which code?

A.International Plumbing Code (IPC)

B.Uniform Plumbing Code (UPC)

C.Wisconsin State Plumbing Code (Comm 81-87, now SPS 381-387)

D.National Standard Plumbing Code (NSPC)

Explanation: Wisconsin uses its own state-specific plumbing code, originally codified as Comm 81-87 (now SPS 381-387). Unlike most states that adopt the IPC or UPC, Wisconsin maintains an independent plumbing code. This is a key distinction for the state exam.

3What is the passing score for the Wisconsin journeyman plumber exam?

A.60%

B.65%

C.70%

D.75%

Explanation: Wisconsin requires a 70% passing score on the journeyman plumber exam administered through PSI. The exam consists of approximately 100 questions with a 3-hour time limit.

4Per Wisconsin plumbing code, what is the minimum slope for a 4-inch horizontal drainage pipe?

A.1/16 inch per foot

B.1/8 inch per foot

C.1/4 inch per foot

D.1/2 inch per foot

Explanation: The Wisconsin plumbing code requires horizontal drainage pipes 3 inches and larger to have a minimum slope of 1/8 inch per foot.

5Per Wisconsin code (SPS 382), what is the DFU value for a water closet?

A.2 DFU

B.3 DFU

C.4 DFU

D.6 DFU

Explanation: A water closet has a DFU value of 4 per the Wisconsin plumbing code. This value is used for sizing drainage and vent piping.

6Per Wisconsin code, what is the minimum building sewer size?

A.3 inches

B.4 inches

C.6 inches

D.Depends on DFU load only

Explanation: The Wisconsin plumbing code requires a minimum 4-inch building sewer. This is more conservative than the IPC's 3-inch minimum and helps prevent blockages.

7Per Wisconsin code, what is the maximum cleanout interval in horizontal drainage lines?

A.50 feet

B.75 feet

C.100 feet

D.150 feet

Explanation: Cleanouts must be installed at intervals not exceeding 100 feet in horizontal drainage lines per the Wisconsin plumbing code.

8Per Wisconsin code, what is the minimum trap seal depth?

A.1 inch

B.2 inches

C.3 inches

D.4 inches

Explanation: The Wisconsin plumbing code requires a minimum trap seal depth of 2 inches for most fixtures. The maximum is 4 inches.

9Per Wisconsin code, what is the maximum DFU load on a 2-inch horizontal branch?

A.3 DFU

B.6 DFU

C.12 DFU

D.16 DFU

Explanation: A 2-inch horizontal branch can serve a maximum of 6 DFUs per the Wisconsin plumbing code drainage tables.

10Per Wisconsin code, what fitting is required for horizontal direction changes in drainage?

A.Any elbow

B.Long-sweep fittings

C.Short-radius elbows

D.Sanitary tee only

Explanation: Long-sweep fittings are required for horizontal direction changes in drainage systems per the Wisconsin plumbing code.

About the WI Plumber Exam

Wisconsin journeyman plumber licensing exam administered by PSI and overseen by DSPS. Based on the Wisconsin State Plumbing Code (SPS 381-387, formerly Comm 81-87) — Wisconsin is one of the few states with its own independent plumbing code rather than adopting the IPC or UPC. Includes unique frost protection, POWTS, and cross-connection control requirements.

Questions

100 scored questions

Time Limit

3 hours

Passing Score

70%

Exam Fee

$180 (Wisconsin Department of Safety and Professional Services (DSPS))

WI Plumber Exam Content Outline

25%

Drainage Systems

Drain pipe sizing, fixture units, slope requirements, cleanouts, 4-inch minimum building sewer, indirect waste, and Wisconsin-specific drainage requirements

20%

Water Supply Systems

Water pipe sizing, WSFU calculations, backflow prevention, Wisconsin cross-connection control program, water heaters, and pressure regulation

20%

Venting Systems

Vent sizing, wet venting, circuit venting, vent termination, Wisconsin frost closure requirements (12-inch minimum, 3-inch through-roof), and trap seal protection

15%

Fixtures & Appliances

Fixture installation, clearances, accessible fixtures, commercial fixtures, scald prevention, and fixture counts per occupancy

10%

Gas Piping

Gas pipe sizing, BTU calculations, appliance venting, pressure testing, CSST bonding, and combustion air requirements

10%

Code Administration & Materials

DSPS licensing (apprentice/journeyman/master/master-restricted), permits, inspections, POWTS regulations, approved materials, and Wisconsin-specific code provisions

How to Pass the WI Plumber Exam

What You Need to Know

Passing score: 70%
Exam length: 100 questions
Time limit: 3 hours
Exam fee: $180

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

WI Plumber Study Tips from Top Performers

1Study the Wisconsin State Plumbing Code (SPS 381-387), NOT the IPC or UPC — Wisconsin has its own code

2Learn Wisconsin-specific frost closure requirements: 12-inch vent extension, 3-inch minimum through-roof vent size

3Master DFU calculations and drain pipe sizing using Wisconsin code tables

4Study Wisconsin's 4-inch minimum building sewer requirement

5Understand Wisconsin's comprehensive POWTS (Private Onsite Wastewater Treatment) regulations

6Review Wisconsin's statewide cross-connection control program and annual testing requirements

7Know the Wisconsin license categories: apprentice, journeyman, master, and master-restricted

8Practice timed exams — 100 questions in 3 hours requires efficient pacing

Frequently Asked Questions

How hard is the Wisconsin journeyman plumber exam?

The Wisconsin exam is challenging with an estimated 50-60% pass rate. It has approximately 100 questions and requires 70% to pass. Wisconsin's independent plumbing code (SPS 381-387) means study materials for the IPC or UPC alone are insufficient.

What plumbing code does Wisconsin use?

Wisconsin uses its own independent State Plumbing Code (SPS 381-387, formerly Comm 81-87). This is NOT the IPC or UPC. Wisconsin is one of the few states that maintains an independent plumbing code with unique provisions for frost protection, POWTS, and cross-connection control.

How much does the Wisconsin plumber exam cost?

The Wisconsin journeyman plumber exam fee is approximately $180, administered through PSI. Additional DSPS license fees may apply.

What license categories does Wisconsin have?

Wisconsin maintains apprentice, journeyman, master plumber, and master plumber-restricted categories. The master plumber-restricted license has a limited scope of work and is unique to Wisconsin.