Delaware Master Plumber Exam Prep

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Official sitting

Questions100
Time3 hours
Passing score70%
BookOpen book

Confirm question count, time, open-book rules, and passing score on the live board bulletin before you sit. We do not guarantee a passing result. Source: Prov Delaware DPR CIB 2025.06.24 (plumbing examinations 70%).

What’s included

19,000+ word study guide

Worked calculations, code-section breakdowns, exam traps, a key-terms glossary and a 30/60/90-day plan.

4 full-length practice exams

Original questions weighted to match the topic mix of the real exam.

400 practice questions

Every one with a written explanation and the code section behind the answer.

Same study guide and four exams on every term. You are choosing how long you can log in.

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What this prep covers

  1. About the Delaware Master Plumber license
  2. How Delaware licensing works
  3. Plumbing math and fundamentals
  4. How the plumbing code is organized
  5. Sanitary drainage, waste, and vent (DWV)
  6. Venting
  7. Water supply and distribution
  8. Fixtures, traps, and interceptors
  9. Water heaters, relief, and gas
  10. Backflow prevention and cross-connection control
  11. Fixtures required by occupancy, clearances, and accessibility
  12. Materials, joining, and storm drainage
  13. Inspection, testing, and isometrics
  14. Worked calculations
  15. Sample exam questions, solved
  16. Common mistakes and exam traps

…and 4 further sections in the full guide.

Delaware Master Plumber licensing, explained

About the Delaware Master Plumber license

Delaware licenses plumbers through the Board of Plumbing, Heating, Ventilation, Air Conditioning, and Refrigeration Examiners, part of the Delaware Division of Professional Regulation. The Master Plumber is the senior plumbing credential. It generally requires you to first hold a journeyman plumber license, accumulate additional documented experience as a licensed journeyman, and pass a more demanding exam that adds system design, sizing, code administration, and often business-and-law content. A master may design plumbing systems, pull permits, supervise journeymen and apprentices, and serve as the qualifying individual for a licensed plumbing contractor.

Your exam is built on the International Plumbing Code (IPC) 2018, which is the edition named on the 2025.06.24 Prov bulletin. The two model codes — the Uniform Plumbing Code (UPC) published by IAPMO and the International Plumbing Code (IPC) published by the ICC — agree on the physics but differ in tables, fixture-unit values, and some sizing methods, so always work from the one your state adopted.

Know these scope facts cold: the license is held by the individual; most work requires a permit and inspection (rough-in/top-out and final); you must work within the classification you hold; and unlicensed or out-of-scope plumbing work is a violation that can cost you the license and carry penalties. Plumbing protects public health — the exam constantly returns to the two core purposes of the code: deliver safe potable water and remove waste without contaminating that water.

How Delaware licensing works

  • Experience: documented hours in the trade (apprentice and journeyman time); the master license requires journeyman time on top of the base requirement.
  • Education: approved instruction hours or completion of an approved apprenticeship program.
  • Application: submit the application, fees, and proof of experience (often signed off by a master plumber or employer) before you are approved to sit.
  • Exam vendor: Prov, for the Delaware Division of Professional Regulation. The trade paper is 100 questions, 3 hours, and 70 percent (70 of 100). This bulletin does not add a business-and-law portion to the master plumber sitting. Electrician exams on the same bulletin are 75 percent. This one is not.
  • Renewal: licenses renew on a fixed cycle and usually require continuing education, including code-update hours when a new code edition is adopted.

This is the opening of the full study guide. The complete guide continues into code navigation, worked calculations and solved exam questions.

Other Delaware exam prep

Delaware Master Plumber exam — common questions

Who administers the Delaware Master Plumber exam?

The Delaware Master Plumber is administered by Delaware DPR / Prov CIB 2025.06.24. Master plumber: 100 Q / 3 hours (180 min) / 70% (70 of 100). Open book: IPC 2018, IFGC 2018, Plumbing Basics for Contractors 3rd edition 2014. Not the UPC. Not PSI. Pearson publishes the handbook; Pearson is not the testing vendor. Not the electrician paper (75%). Mix: general knowledge 16 / isometrics and plan reading 8 / plumbing math 8 / DWV 14 / water supply 14 / fixtures 8 / water heaters 10 / fuel gas 10 / storm and roof 6 / safety 6..

How many questions are on the Delaware Master Plumber exam?

The exam contains 100 questions. You need 70% to pass. You are allowed 3 hours.

How much practice does this prep include?

It includes 4 full-length practice exams and 400 practice questions in total. Every question has a written explanation naming the code section the answer comes from.

How long is the study guide?

The Delaware Master Plumber guide runs to roughly 19,026 words, covering 20 sections from licensing rules through worked calculations and solved exam questions.

How long do I get access?

Choose 30, 60 or 90 days at checkout. Access begins the moment you enrol, works on any device, and you can retake every practice exam as often as you like. Days remaining are shown in your dashboard and you can extend at any time.

Is this an official Delaware Master Plumber exam?

No. This is independent preparation material. It is not affiliated with or endorsed by any state licensing board or exam vendor, and it does not contain real exam questions. Always confirm current requirements with your licensing board.

About this Delaware Master Plumber prep

This prep is built specifically for the Delaware Master Plumber examination and includes a 19,000+-word study guide written for this exam, 4 full-length practice exams and 400 practice questions, each with a written explanation.

The Delaware Master Plumber is administered by Delaware DPR / Prov CIB 2025.06.24. Master plumber: 100 Q / 3 hours (180 min) / 70% (70 of 100). Open book: IPC 2018, IFGC 2018, Plumbing Basics for Contractors 3rd edition 2014. Not the UPC. Not PSI. Pearson publishes the handbook; Pearson is not the testing vendor. Not the electrician paper (75%). Mix: general knowledge 16 / isometrics and plan reading 8 / plumbing math 8 / DWV 14 / water supply 14 / fixtures 8 / water heaters 10 / fuel gas 10 / storm and roof 6 / safety 6.. This prep is written to that board’s current scope, not to a generic national syllabus.

The real Delaware Master Plumber exam contains 100 questions, with a passing score of 70%. Our practice exams mirror that structure so the format is familiar before you sit it.

Topics covered

  • About the Delaware Master Plumber license
  • How Delaware licensing works
  • Plumbing math and fundamentals
  • How the plumbing code is organized
  • Sanitary drainage, waste, and vent (DWV)
  • Venting
  • Water supply and distribution
  • Fixtures, traps, and interceptors
  • Water heaters, relief, and gas
  • Backflow prevention and cross-connection control
  • Fixtures required by occupancy, clearances, and accessibility
  • Materials, joining, and storm drainage
  • Inspection, testing, and isometrics
  • Worked calculations
  • Sample exam questions, solved
  • Common mistakes and exam traps
  • Key chapters and tables to tab
  • Glossary of must-know terms
  • Your 30 / 60 / 90 day study plan
  • Exam-day strategy

How access works

You are paying for access length (30, 60, or 90 days). The study guide and four timed exams are the same on every term. Access starts when you enrol and works on any device for that term.

Not affiliated with or endorsed by any state licensing board or exam vendor. For exam-preparation purposes only.