Michigan LARA license exam · given by PSI

Master Plumber practice test

Practice for the Michigan master plumber exam with original questions on the 2021 Michigan Plumbing Code and the Skilled Trades Regulation Act: sizing, storm drains, special waste, backflow, testing, and Michigan plumbing law. (236 questions total: 10 free + 226 in the paid pass.)

130questions

180minutes

75%to pass

Open book2021 MPC (PA 230 and 407 on screen)

Exam format from the PSI candidate bulletin. Exam fee: $100.

Practice the Master Plumber exam

Free 10-question sample236 questions total: 10 free + 226 in the paid pass. Instant answers and explanations. No sign-up.Free · start now Full 130-question mock examReal exam format: a fresh draw from the 226 paid questions each time, 180-minute timer, 75% passing line, and a topic breakdown. Pass required Unlocked

Topic drills (pass required)

Michigan law: licensing, contractors, and permits (PA 407, PA 230) 22 Code administration and general regulations 17 Fixture requirements and facilities 21 Water heaters and hot water systems 12 Water supply design and distribution 26 Backflow protection 19 Sanitary drainage design 30 Venting design 28 Storm drainage 17 Interceptors, special waste, and indirect waste 17 Inspection and testing 12 Material take-off: back-to-back restrooms 15

Get the Master Plumber pass ($29)Full Plumbing pass: journey + master ($45)

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Refunds: within 7 days of purchase, if you haven’t finished a full mock exam and have seen fewer than 10% of the paid questions. Try the free 10-question sample before you buy. Refund policy

Review status: pending licensed plumber review. These are original questions written to the PSI content outline and referenced to the 2021 Michigan Plumbing Code. Calculations were checked by script, but no licensed plumber has reviewed them yet, so we don’t claim they are expert-reviewed. Spot an error? Use “Report this question” on any item.

What’s on the exam

Topic	Our estimated weight	In our mock	Bank
Michigan law: licensing, contractors, and permits (PA 407, PA 230) Master licensing (PA 407) Contractor licensing (PA 407) Fees and renewal (PA 407) Permits (PA 407) Exemptions (PA 407) Inspectors (PA 407) State construction code (PA 230) Complaints (PA 407)	9%	12	22
Code administration and general regulations Code scope Code adoption Permits Health and safety General regulations	7%	9	17
Fixture requirements and facilities Fixture calculations Separate facilities Access to facilities Compartments and partitions Fixture substitution Floor drains Tempered water Emergency fixtures Flushing devices Fixture fittings Drinking fountains	9%	12	21
Water heaters and hot water systems Relief valve discharge Hot water systems Hot water math Thermal expansion Water heater pans Relief valves	5%	7	12
Water supply design and distribution Pressure design Pipe sizing Valves Materials Non-potable systems Water tanks Disinfection Thermal expansion Water service	11%	14	26
Backflow protection Hazard assessment Device selection Device installation Testing Air gaps Cross connections	8%	10	19
Sanitary drainage design Drain sizing Stack sizing Branch sizing Stack offsets Fixture units Future fixtures Building sewer Sumps and ejectors Cleanouts Fittings	13%	17	30
Venting design Vent terminals Stack offsets Relief vents Vent sizing Wet venting Circuit venting Combination waste and vent Island venting Air admittance valves Trap-to-vent distance Common vents Waste stack vents Single stack Vent connections	12%	16	28
Storm drainage Storm sizing Secondary drainage Storm connections Roof drains Storm math Subsoil drainage Storm materials Controlled flow	7%	9	17
Interceptors, special waste, and indirect waste Grease interceptors Oil and sand Interceptor rules Indirect waste Special wastes	7%	9	17
Inspection and testing Required tests Inspections Backflow inspection Water service test	5%	6	12
Material take-off: back-to-back restrooms Fixture count DFU take-off Carriers and fittings Pipe take-off Cost take-off Tempered water take-off Vent take-off	7%	9	15

About the weights: PSI lists the content areas but not how many questions come from each. These weights are our estimate.

Test-day facts

Computer-based at PSI test centers, after LARA approves your application.
Open book: bring the 2021 Michigan Plumbing Code with chapter tabs only. PA 230 and PA 407 are provided on screen.
The exam includes a material take-off: a back-to-back restroom drawing where you list fittings, size drains and vents, and identify venting methods.

Sources: PSI Candidate Information Bulletin 4605 (plumbing, effective Apr 29, 2026) · LARA plumbing exam information. Checked October 30, 2026. Rules and fees change, so confirm with LARA and PSI before you apply.

Master Plumber exam FAQ

How many questions are on the Michigan master plumber exam?

PSI’s bulletin lists 130 questions in 180 minutes. You need 75% to pass.

Can I bring PA 407 to the master plumber exam?

No. PSI provides PA 230 and PA 407 on screen for the master exam. You bring only the 2021 Plumbing Code with chapter tabs.

What is the material take-off?

A drawing of back-to-back restrooms with all needed data. Using the plumbing code, you list the fittings, size the drains and vents, and identify venting methods.

What does the exam cost?

PSI lists a $100 exam fee, valid for one year.

Are these the real exam questions?

No. MI Trade Prep questions are original practice items written to PSI’s published content outline. They are not actual exam questions, and MI Trade Prep is not affiliated with LARA or PSI.

Study guide: Michigan master plumber exam: format and study plan