MD Plumber study guide
MD Plumber · Work through your exam, one topic at a time.
The Maryland Plumber License Exam is the credentialing pathway for plumbers who want to work in Maryland as journeyman or master plumbers. It is intended for plumbing professionals who already have practical field experience and now need to demonstrate code knowledge, system competence, and regulatory understanding to obtain or advance a Maryland license. The exam is organized around four content areas: general plumbing knowledge, plumbing fixtures and equipment, water supply and drainage systems, and Maryland plumbing code and regulations. Candidates should expect questions that test both practical system design and code application rather than simple recall. The MD Plumber study guide has 4 sections and about 1,578 words.
01General Plumbing Knowledge
This domain tests the physical and math fundamentals behind every plumbing installation: gravity drainage, trap seals, pressure, fixture units, approved materials, and safe work practices. Exam items often ask you to apply a rule to a field situation rather than simply recall a definition.
402 words, about 2 min02Plumbing Fixtures and Equipment
This domain tests fixture selection and installation, water heaters, backflow protection, clearances, and equipment safety. Questions often present a realistic installation mistake and ask what is wrong or what correction is required.
381 words, about 2 min03Water Supply and Drainage Systems
This domain tests how water supply and drainage systems are sized, vented, and protected. Expect questions on pressure, fixture units, drain slopes, venting, cleanouts, backflow, and sump or ejector systems.
388 words, about 2 min04Maryland Plumbing Code and Regulations
This domain tests Maryland-specific administration: which code applies, who may perform and permit work, how inspections are handled, and where state and local rules interact. The Maryland Plumbing Code is adopted under COMAR and is based on the International Plumbing Code with Maryland amendments; local jurisdictions may add stricter requirements, so the enforced edition and local amendments matter.
407 words, about 2 min