LA Plumber study plan

Map the DWV domain's weight (20%) against the exam blueprint and rank its subtopics by how often they appear in real plan-review work

Define and compute drainage fixture units for a single-family layout containing a water closet, lavatory, kitchen sink, and clothes washer, then size the building drain and building sewer from those totals

Sketch a full DWV isometric for a two-bath house, labeling every trap, vent, and drain segment with its size and slope

State the code limits on trap arm length, vent stack distance from the fixture, and horizontal drain slope (1/4 in. per ft for 2 in. and smaller) and check your sketch against each limit

Build a one-page formula sheet covering fixture units, drainage pipe sizing, and slope conversions, and use it to solve 10 practice problems

Diagram venting arrangements for a bathroom group, kitchen sink, and laundry, identifying each vent type (individual, common, wet, circuit, studor/air admittance where allowed) and the conditions that permit it

Calculate developed length from the water meter to the farthest fixture and use it to select water supply pipe sizes for a typical house

Compare PEX, copper, CPVC, and galvanized pipe on joining method, pressure rating, and code acceptance, and write a short comparison table

Outline the hydrostatic and flow tests required for DWV and water supply systems, including test pressure, duration, and who witnesses the test

Work 12 mixed practice questions on venting and water supply sizing, and log every miss with the code section that resolves it

Identify the five backflow prevention assemblies/devices in common use and state where each is required versus merely permitted

Trace a potable water system from meter through a reduced-pressure principle assembly to a hose bibb and explain how each cross-connection is isolated

Describe air gap requirements for sinks, dishwashers, and water heater relief valves, and calculate the minimum air gap dimension

Explain testing and annual inspection requirements for backflow assemblies and who is qualified to test them

Draft a 15-question self-quiz on cross-connection control and score it without notes

Size and select water closets, lavatories, and bathtubs by fixture unit rating and confirm clearance and installation requirements for each

Install-in-mind: sequence the steps to set a water heater, including seismic strapping, relief valve piping, drain pan, and venting

Compare tank and tankless water heaters on venting category, combustion air, and temperature/pressure relief protection

Identify fuel gas piping materials, sizing methods, and the leak test procedure including test pressure and duration

Solve 10 practice problems combining fixture selection and water heater/fuel gas requirements

Compute sanitary drainage loads for a multi-story building using fixture units and convert to pipe sizes with the correct slope

Size a storm drainage system from roof area and rainfall intensity, and explain the difference between sanitary and storm systems

Calculate sewer invert elevations and pipe grades across a run, showing fall per foot and total fall

Explain grease interceptor sizing and where interceptors are required

Complete a 15-problem math set on fixture units, storm drainage, and grade calculations with a timed limit

Outline the permit process from application through inspection and final, naming the inspections that occur at rough-in, top-out, and final stages

List the licensing and continuing education requirements for a plumber in the jurisdiction and note where to verify them

Build a job-site safety checklist covering trenching and excavation, confined space, soldering fire watch, and ladder use

Describe the correct tool for cutting, joining, and testing each pipe material and note the personal protective equipment required

Answer 10 regulation and safety questions and verify each answer against an adopted code or statute

Re-solve every missed question from weeks 1 through 6 and record the underlying rule, not just the answer

Take a 40-question mixed practice exam weighted to the blueprint percentages and score it by domain

Review the two weakest domains from that exam and rewrite your formula and reference sheets to close the gaps

Practice explaining three DWV or backflow scenarios aloud in under two minutes each, as if teaching an apprentice

Take two full-length timed practice exams under exam conditions and score each by domain

Review only the highest-frequency errors and confirm each is resolved with a code citation

Memorize the fixture-unit table, slope rules, and test pressures well enough to reproduce them from memory

Finalize a one-page exam-day reference card containing only facts you can state with confidence

Plan exam-day logistics including arrival time, identification, and permitted reference materials