DC Plumber case studies
DC Plumber · Put your knowledge to work in context.
The District of Columbia Plumber License Examination is the assessment used by the DC Board of Industrial Trades, under the Department of Licensing and Consumer Protection (DLCP), to decide whether an applicant is qualified to hold a plumbing license in the District. It serves apprentices moving up to journeyman status, experienced plumbers relocating from other jurisdictions, and master-level candidates who intend to contract, supervise, and pull permits. Expect the exam to test the DC Plumbing Code together with the adopted model code and local amendments, because DC-specific provisions on permits, inspections, and installation details differ from other jurisdictions. Questions also reach into water distribution and sizing, drainage and venting, fixtures and water heaters, fuel gas piping, backflow prevention and cross-connection control, and job-site safety. The DC Plumber case studies are 5 cases and about 2,138 words.
1Basement Bathroom Added Off a 1920s Cast-Iron Stack
An owner of a 1926 Capitol Hill rowhouse wants to convert a basement storage room into a rentable suite. The basement floor is 7 ft below the curb.
481 words, about 2 min2T&P Dripping After a Meter Backflow Preventer
A 12-story condominium has a 6 in. domestic service at 105 psi street pressure.
435 words, about 2 min3Gas Load Check for a Tankless Heater and Range
A condo owner in a 1960s building replaces an electric range with a 65,000 Btu/h gas range and adds a 199,000 Btu/h condensing tankless water heater. The existing gas meter and 1 in.
435 words, about 2 min4Dental Office Cross-Connections and an Expired RPZ Tag
A six-story mixed-use building has a ground-floor dental office. The domestic service is 2 in.
389 words, about 2 min5Unpermitted Basement Kitchenette Found at Sale
A Petworth rowhouse is under contract. The home inspector finds a basement kitchenette added by the seller in 2021: a sink, dishwasher, 40 gal gas water heater, and a new 3/4 in.
398 words, about 2 min