Master Plumber Board Exam Coverage 2026: Subjects, Weights, Qualifications and Requirements
Updated:
The Master Plumbers Licensure Examination measures an applicant’s knowledge of plumbing arithmetic, the plumbing code, sanitary plumbing design, installation, materials, estimating and practical problem-solving.
This guide explains the four written examination areas, their weights, qualifications for admission, current PRC documentary requirements and the major topics to review.
Master Plumber Board Exam Subjects and Weights
| Subject | Weight | Main Focus |
|---|---|---|
| Plumbing Arithmetic | 10% | Algebra, geometry, trigonometry, physics, measurements and basic financial arithmetic |
| Plumbing Code | 10% | Code provisions, materials, fixtures, drainage, venting, water supply, permits, inspections and tests |
| Sanitation, Plumbing Design and Installation | 40% | Water supply, sanitary drainage, venting, storm drainage, sewage disposal, pumps, tanks and system design |
| Practical Problems | 40% | Plan reading, design computations, materials, fixtures, estimates, installation and troubleshooting |
1. Plumbing Arithmetic — 10%
Topics to review
- Whole numbers, fractions and decimals
- Ratios and proportions
- Percentages
- Modern algebra
- Plane geometry
- Trigonometry
- Areas and volumes
- Unit conversions
- Basic physics
- Pressure, head and flow calculations
- Financial arithmetic
- Material quantities and cost calculations
Practice dimensional analysis and unit conversion. Plumbing computations often combine lengths, areas, volumes, flow rates, pressure and fixture demand.
2. Plumbing Code — 10%
Topics to review
- Code of ethics and responsibilities
- Permits and inspections
- Plumbing terminology
- General regulations
- Approved materials and standards
- Joints and connections
- Traps and cleanouts
- Water supply and distribution
- Plumbing fixtures
- Drainage fixture-unit values
- Drain, waste and vent sizing
- Ventilation requirements
- House drains and building sewers
- Horizontal branches and stacks
- Hot-water and steam waste
- Special wastes
- Testing and inspection
- Septic tanks and private sewage disposal
Code questions require familiarity with definitions, minimum sizes, permitted arrangements and prohibited connections. Review both the rule and the purpose behind it.
3. Sanitation, Plumbing Design and Installation — 40%
Water supply systems
- Sources and quality of water
- Water demand and fixture units
- Pipe sizing
- Pressure and head requirements
- Direct and indirect distribution systems
- Water tanks, cisterns and pressure vessels
- Pumps and pumping systems
- Hot-water systems
- Backflow prevention
Sanitary drainage and venting
- Building drains and building sewers
- Soil, waste and vent stacks
- Horizontal branches
- Fixture-unit calculations
- Trap seals and venting methods
- Cleanouts and access
- Slope and velocity requirements
- Indirect waste connections
- Grease traps and interceptors
Storm drainage and sewage disposal
- Roof and storm drainage
- Downspouts and conductors
- Subsurface drainage
- Septic tanks
- Private sewage-disposal systems
- Wastewater treatment principles
- Dry and wet standpipe concepts
- Environmental and sanitation considerations
Installation and workmanship
- Pipe supports and protection
- Installation clearances
- Testing and commissioning
- Coordination with architectural and structural plans
- Safety and workmanship standards
- Plans, details and specifications
4. Practical Problems — 40%
Topics to review
- Plan reading and interpretation
- Plumbing layout analysis
- Fixture-unit calculations
- Pipe-sizing problems
- Water-supply calculations
- Drainage and vent design
- Storm-drainage calculations
- Septic-tank and sewage-disposal problems
- Plumbing materials and specifications
- Fixtures and appliances
- Hand and machine tools
- Maintenance and repair
- Bill of materials
- Quantity and cost estimates
- Obligations and contracts
Practical Problems carries one of the two largest weights. Practice complete solutions using plans, code tables, fixture units, pipe sizes, elevations, slopes and estimates.
Continue Your Master Plumber Review
Use practice tests and mathematics notes after reviewing the complete subject coverage.
Browse Practice Tests Review Math NotesWho May Take the Master Plumber Licensure Examination?
PRC currently recognizes several applicant routes.
Degree holders
Graduates of the following programs may apply, subject to the required Transcript of Records and other PRC documents:
- Architecture
- Mechanical Engineering
- Civil Engineering
- Chemical Engineering
- Mining Engineering
- Sanitary Engineering
Registered professionals
Licensed professionals in the fields listed above may be required to attach a photocopy of a valid PRC Professional Identification Card.
Non-degree holders
A non-degree holder may qualify by presenting a high school diploma or Transcript of Records and a notarized certificate showing at least five years of actual plumbing experience under the supervision of a registered Master Plumber.
Current PRC Application Requirements
The PRC requirements page currently lists the following core documents:
- PSA-issued birth certificate;
- PSA marriage certificate or contract for married female applicants, when applicable;
- Transcript of Records with scanned picture and the remark “For Board Examination Purposes”;
- Transcript of Records with Special Order number for applicable degree holders;
- Photocopy of valid PRC ID for registered professionals;
- High school diploma or Transcript of Records for qualified non-degree holders;
- Notarized five-year Certificate of Experience signed by a registered Master Plumber for qualified non-degree holders;
- Photocopy of the supervising Master Plumber’s valid PRC ID; and
- Payment of the applicable examination fee.
Master Plumber Exam Passing Information
Your old page contained two conflicting passing-score statements—70% and 75%. To avoid publishing contradictory information, this rewrite does not present either figure as a confirmed current rule.
How to Review for the Master Plumber Board Exam
1. Prioritize the two 40% subjects
Sanitation, Plumbing Design and Installation and Practical Problems together account for most of the written examination. Give them the largest share of your review time.
2. Learn the code through application
Connect each code provision to an actual layout, connection, fixture, vent, drain or inspection situation.
3. Practice using tables
Train yourself to locate fixture-unit values, minimum pipe sizes, vent limits and drainage capacities quickly.
4. Draw the system before solving
Sketch the water, drainage and vent layout before making calculations. A clear diagram helps prevent wrong assumptions.
5. Keep units consistent
Write all units throughout the solution and convert only when necessary. Many errors come from mixing metric and customary units.
6. Practice complete design problems
Combine plan interpretation, fixture units, pipe sizing, slope, venting, materials and estimates in one timed exercise.
Frequently Asked Questions
What are the four Master Plumber exam subjects?
The four current written subjects are Plumbing Arithmetic, Plumbing Code, Sanitation, Plumbing Design and Installation, and Practical Problems.
Which subjects have the largest weight?
Sanitation, Plumbing Design and Installation and Practical Problems each carry 40%.
Can a Civil Engineering graduate take the exam?
Yes. Civil Engineering is one of the degree programs currently listed by PRC for Master Plumbing applicants.
Can a non-degree holder apply?
A qualified non-degree holder may apply by presenting the required school records and a notarized certificate of at least five years of actual plumbing experience under a registered Master Plumber.
What law governs Master Plumbing?
Republic Act No. 1378, known as the Plumbing Law, regulates the trade and registration of Master Plumbers.
Final Reminder
Use this Master Plumber Board Exam coverage as a review framework, but verify examination dates, subject order, documentary requirements, permitted materials and examination-day instructions through the latest PRC announcement.