DE Plumber study guide
DE Plumber · Work through your exam, one topic at a time.
The Delaware Plumber credential is a professional license issued through the State of Delaware's Division of Professional Regulation (DPR), the agency whose stated mission is "to credential qualified professionals to ensure the protection of the public's health, safety, and welfare." Plumbers appear on the DPR's list of regulated professions under its construction-related offerings, alongside Electricians, HVACR, Home Inspectors, and similar trades. The license is intended for individuals who install, alter, and repair plumbing systems and who need state authorization to work in the trade. Applications, renewals, contact updates, and status checks are handled through DPR's online licensing system, DELPROS, and the agency publishes instructional videos and a Guide to Information for each service. Candidates should treat this page as an independent study aid rather than an official document: DPR does not publish exam content outlines, question counts, time limits, or passing scores on the source page used here, so this material is organized around four balanced study domains - trade knowledge and practice, code and regulation, safety and health, and business and project management - each weighted equally. The DE Plumber study guide has 4 sections and about 1,103 words.
01Plumbing Trade Knowledge and Practice
Trade knowledge questions test whether you understand how a system behaves, not just how to assemble pipe. Expect coverage of water supply (fixture units, pressure vs.
297 words, about 1 min02Plumbing Code and Regulation
Code questions test your ability to apply adopted rules consistently. Understand the hierarchy: model codes (such as the Uniform Plumbing Code or International Plumbing Code as adopted locally) plus local amendments govern the work.
289 words, about 1 min03Safety and Health
Safety questions test hazard recognition and control. Know the hierarchy of controls (elimination, substitution, engineering controls, administrative controls, PPE), and apply it to plumbing tasks: confined-space entry, trenching and excavation, soldering and brazing fumes, lead and asbestos in older systems, sewer gas (hydrogen sulfide, methane), and biological hazards from sewage.
258 words, about 1 min04Business and Project Management
Business questions test estimating, contracts, scheduling, and jobsite management. Know how to build a bid from labor, material, equipment, overhead, and profit; understand change orders, retainage, and lien rights; and read a basic schedule (critical path, float).
259 words, about 1 min