About This Book
The 2025 California Plumbing Code (CPC), officially Title 24, Part 5 of the California Code of Regulations, establishes minimum statewide standards for plumbing design, materials, and installation.
Key Details - Base Model: Derived from the 2024 Uniform Plumbing Code (UPC) by IAPMO, with California-specific amendments. - Effective Date: January 1, 2026 (published by the California Building Standards Commission). - Purpose: Mandates safety requirements for water supply, sanitary drainage, gas piping, fixtures, and alternate water sources (graywater, rainwater) to protect public health.
The full text is available through the 2025 CPC Online Edition or Up.Codes.
Code Structure - Chapters 1–4: Administration, definitions, general regulations, and fixtures. - Chapters 5–12: Water heaters, supply systems, sanitary drainage, vents, and fuel gas piping. - Chapters 13–17 & Appendices: Health care facilities, nonpotable/graywater systems, and sizing references.
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Practice Tests Using This Book
This book is required or recommended for 1 licensing exam. We've written 237 practice questions directly from this material, each one citing the chapter and section it comes from.