Book updated Jun 2026.
The Hawaii Plumbing Contractor Exam is very comprehensive as it covers plumbing, gas and medical gas. Topics include: General Knowledge; Fixtures and Fittings; Storm and Roof Drainage; Fuel Gas Systems; Safety – OSHA; Water Supply Distribution; Water Heaters; Sewer, Drain, Waste and Vent Systems and Excavation; Plumbing Math; Medical Gas.
We create these self-practice test questions module referencing the concepts and principles currently valid in the written exam. Each question comes with an answer and a short explanation which aids you in seeking further study information. We want to make sure these questions are tough enough to really test your readiness and draw your focus to the weak areas. Think of these as challenges presented to you so to assess your comprehension of the subject matters. The goal is to reinforce learning, to validate successful transference of knowledge and to identify areas of weakness that require remediation.
