P1 · area 04 · subtopic 0403
Water Supply and Protection
6 percent of the P1 Residential Plumbing Inspector exam. At 60 questions, that is roughly 3 to 4 questions, each with about 120 seconds of budget including the lookup.
- Exam
- P1
- Area
- Water Supply and Distribution
- Weight
- 6%
- Questions
- ~3 to 4
What this subtopic covers
Potable water supply and distribution piping properly protected against contamination.
How to drill it
- Find the chapter of the International Residential Code that carries this subject and read it once for structure, not retention: what lives here, what gets sent elsewhere, which tables exist.
- Write your own plain-language phrases for what this subtopic covers, then note the code's terms beside them. Mismatches between the two columns are exactly where exam questions cost you time.
- Run timed lookups: pick a requirement named in the descriptor above, start a stopwatch, find the governing text in your book, stop. Log the seconds. Past two minutes is a miss even when the answer is right.
- Weight your reps to the number above. Roughly 3 to 4 questions means this subtopic deserves a dedicated drill session of its own.
2024 IRC Fast-TabsPre-printed tabs for the 2024 edition. Place them yourself; the placement is the study.Check priceTranslation trap on this subtopic
backflow prevention: the code files this as water supply and protection. Cross-connection control is filed under water supply protection, not under fixtures or valves.
The rest of area 04: Water Supply and Distribution (21%)
| Subtopic | Weight | |
|---|---|---|
| 0401 | Materials, Joints and Connections | 3% |
| 0402 | Service and Distribution Piping | 7% |
| 0404 | Pressure and Volume | 3% |
| 0405 | Potable Water and Water Treatment | 2% |
The kit that goes on the table
2024 IRCThe book itself
2021 IRCIf you register on 20212024 Fast-TabsPlace them yourself
Construction Master ProFeet-inch math, no errorsMatch the book and tabs to the edition you register for.Confirm which, first.
The 120-second study sheet
One page: every topic weight on all four residential exams, the plain-language to code-language glossary, and the two-week study sequence. Free, straight to your inbox.
No spam, no selling your address. One useful sheet and occasional exam-prep notes.