Why this site
Apprentices and plumbers moving between states keep asking the same questions. How many hours do I need? Who gives the test? Why is the exam on an older code book? The answers are spread across state agencies, rule books and testing-company bulletins. We put them side by side.
How we keep it honest
- We add a state only after checking its official sources.
- If an official page doesn't say something, we say so instead of guessing.
- We don't reproduce code text or tables.
Independence
We're not affiliated with any board, IAPMO, PSI, union or contractor group. Some links go to Amazon, and as an Amazon Associate we earn from qualifying purchases. That never changes what we report.
A sister site to TheOldElectrician.com. Facts last checked Nov. 10, 2026.