Book updated Jun 2026. Under the Illinois Plumbing License Law (225 ILCS 320), the IDPH licenses plumbers, plumbing contractors, plumbers’ apprentices, irrigation contractors and retired plumbers. Individuals who plan, inspect, install, alter, extend, repair, and maintain plumbing systems in state of Illinois must be licensed.
We create these self-practice test questions module referencing the concepts and principles currently valid in the 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. The questions are NOT designed to “simulate” actual exam questions. “realistic” or actual questions that are for cheating purpose are not available in any of our products.
