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Exam Review

Key Facts: MI Plumber Exam

75%

Passing Score

PSI candidate bulletin

125

Written Questions

PSI candidate bulletin

$100

PSI Exam Fee

MCL 339.6121

MI/IPC

Code Base

Michigan adoption

Michigan journey plumber applicants must pass two separate examinations. The written test is 125 open-book multiple-choice questions in 180 minutes at a PSI center, with a 75% minimum passing score. The hands-on practical skills examination (copper project plus isometric workbook) is scheduled with LARA's Bureau of Construction Codes. Both are based on the 2021 Michigan Plumbing Code, the Stille-DeRossett-Hale Single State Construction Code Act (1972 PA 230), and the Skilled Trades Regulation Act (2016 PA 407).

Sample MI Plumber Practice Questions

Try these sample questions to review concepts for the MI Plumber exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 348+ question experience with AI tutoring.

1Per the Michigan Plumbing Code as adopted by Michigan, what is the minimum slope for a 4-inch horizontal drain 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: Per the Michigan Plumbing Code (IPC-based), horizontal drainage pipes 4 inches and larger require a minimum slope of 1/8 inch per foot. Pipes 3 inches or smaller require 1/4 inch per foot minimum slope.
2Per the Michigan Plumbing Code, what is the DFU value for a floor-mounted water closet (1.6 GPF)?
A.2 DFU
B.3 DFU
C.4 DFU
D.6 DFU
Explanation: Per the Michigan Plumbing Code (IPC-based) fixture unit table, a floor-mounted water closet with a 1.6 GPF rating has a DFU value of 4. This is the standard value used for drainage system sizing.
3What is the minimum building drain size for a system with 200 DFUs at 1/4 inch per foot slope per the Michigan Plumbing Code / IPC Table 710.1(1)?
A.3 inches
B.4 inches
C.5 inches
D.6 inches
Explanation: Per Michigan Plumbing Code / IPC Table 710.1(1), a 4-inch building drain at 1/4 inch per foot slope can carry up to 216 DFU, so 4 inches is adequate for 200 DFU. At 1/8 inch per foot, a 4-inch drain is limited to 180 DFU and would be insufficient for 200 DFU.
4Per the Michigan Plumbing Code, cleanouts in horizontal drains must be installed at intervals not exceeding what distance?
A.50 feet
B.75 feet
C.100 feet
D.125 feet
Explanation: Per the Michigan Plumbing Code (IPC-based), cleanouts must be installed at maximum 100-foot intervals in horizontal drainage lines. They are also required at changes of direction and at the upper terminal of the building drain.
5Per the Michigan Plumbing Code, what is the minimum slope for a 2-inch horizontal drain 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: Per the Michigan Plumbing Code (IPC-based), horizontal drainage pipes 3 inches and smaller (including 2-inch) require a minimum slope of 1/4 inch per foot to maintain adequate flow velocity.
6Per the Michigan Plumbing Code as adopted by Michigan, a lavatory has what DFU value?
A.0.5 DFU
B.1 DFU
C.1.5 DFU
D.2 DFU
Explanation: Per the Michigan Plumbing Code (IPC-based) fixture unit table, a lavatory has a DFU value of 1. This is one of the lowest individual fixture DFU ratings.
7What is the minimum trap size for a kitchen sink per the Michigan Plumbing Code?
A.1-1/4 inches
B.1-1/2 inches
C.2 inches
D.3 inches
Explanation: Per the Michigan Plumbing Code (IPC-based), the minimum trap and drain size for a kitchen sink is 1-1/2 inches.
8Per the Michigan Plumbing Code, what fitting is required for a horizontal-to-horizontal direction change in drainage piping?
A.Short-sweep quarter bend
B.Long-sweep quarter bend or equivalent
C.Standard tee fitting
D.Any available fitting
Explanation: Per the Michigan Plumbing Code (IPC-based), horizontal-to-horizontal changes of direction must use long-sweep fittings. Short-sweep fittings are restricted to horizontal-to-vertical transitions.
9Per the Michigan Plumbing Code, indirect waste from a commercial dishwasher must discharge through what?
A.A direct connection to the building drain
B.An air gap to an approved receptor
C.A check valve
D.A backwater valve
Explanation: Per the Michigan Plumbing Code (IPC-based), indirect waste from commercial food equipment must discharge through an air gap into an approved floor sink or receptor to prevent contamination.
10Per the Michigan Plumbing Code (IPC-based) Table 710.1(2), what is the maximum DFU load on a 3-inch horizontal fixture branch?
A.20 DFU
B.27 DFU
C.36 DFU
D.42 DFU
Explanation: Per Michigan Plumbing Code / IPC Table 710.1(2), a 3-inch horizontal fixture branch is limited to 20 DFU. Slope-based capacities (36 DFU at 1/8 in/ft, 42 DFU at 1/4 in/ft) apply to building drains and sewers in Table 710.1(1), not horizontal fixture branches.

About the MI Plumber Exam

Michigan journey plumber licensing exam overseen by LARA. The 125-question open-book written examination is delivered by PSI in 180 minutes and requires 75% to pass; a separate hands-on practical skills examination (copper project and isometric workbook) is scheduled directly with the Bureau of Construction Codes.

Exam sponsor: Michigan LARA (Department of Licensing and Regulatory Affairs). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Questions

125 questions

Time Limit

180 minutes (written)

Passing Score

75%

Exam / Certification Fees

$100 PSI fee (+$40 LARA license fee)

Exam sponsor website

Reported exam pass rate: Not published by LARA. Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

25%

Drainage Systems

Drain pipe sizing, DFU calculations, slope requirements, cleanouts, building sewers, indirect waste, and special drainage per Michigan Plumbing Code

20%

Isometric Drawings & Practical

Isometric drawing interpretation, pipe layout reading, system identification from drawings, fixture connection analysis, and practical plumbing system design

20%

Water Supply Systems

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

15%

Venting Systems

Vent sizing, wet venting, circuit venting, vent termination, combination waste and vent, and trap seal protection per Michigan code

10%

Gas Piping

Gas pipe sizing, BTU calculations, appliance venting, pressure testing, combustion air, and fuel gas code compliance

10%

Code Administration & Materials

Permits, inspections, approved materials, pipe materials, joint methods, hangers and supports, and Michigan-specific code amendments

Preparing for the MI Plumber Exam

What You Need to Know

  • Passing score: 75%
  • Exam length: 125 questions
  • Time limit: 180 minutes (written)
  • Exam / certification fees: $100 PSI fee (+$40 LARA license fee) Official sources

Using Our Practice Resources

  • Work through all 348 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

MI Plumber: Suggested Study Strategy

1Practice reading isometric drawings extensively — Michigan's exam uniquely includes a practical/isometric component
2Study the Michigan Plumbing Code (IPC-based) and learn to navigate the code index quickly
3Master DFU calculations and drain pipe sizing using Michigan code fixture unit tables
4Practice interpreting isometric pipe layouts including identifying vent, drain, and supply lines
5Review backflow prevention device selection based on hazard level per Michigan code
6Study water heater installation requirements including T&P relief valve discharge
7Practice gas pipe sizing calculations using BTU input ratings and pipe length tables
8Understand Michigan-specific amendments to the IPC — these differ from national IPC standards

Frequently Asked Questions

How hard is the Michigan journeyman plumber exam?

Michigan requires two separate examinations for a journey plumber license. The written test is 125 open-book multiple-choice questions with a 180-minute time limit and a 75% minimum passing score. A separate hands-on practical skills examination covers a copper project and an isometric workbook. LARA does not publish pass rate data.

What is the isometric drawing component?

Michigan's journeyman plumber exam includes a practical/isometric drawing section where candidates must interpret plumbing system isometric drawings. Questions may require identifying pipe sizes, fixture connections, vent configurations, and drainage layouts from isometric views. This component tests real-world pipe reading skills.

What plumbing code does Michigan use?

Michigan uses the Michigan Plumbing Code, which is based on the International Plumbing Code (IPC) with Michigan-specific amendments administered by LARA. A clean copy is typically allowed as a reference during the PSI-administered exam.

How much does the Michigan plumber exam cost?

Under MCL 339.6121, the journey plumber examination fee is $100 and is paid to PSI, and the journey plumber license fee is $40 per year and is paid to LARA with the application. Budget separately for the 2021 Michigan Plumbing Code book.