Chapter 3 — GENERAL REGULATIONS
304.1 General — 2025 California Plumbing Code
California Plumbing Code (Title 24, Part 5) · 2025 edition · updated 2026-10-19 · California
CBSC: official editions, supplements and errata
Italicized text is a California amendment to the model code, as printed in the official publication.
Cite as: 2025 California Plumbing Code (Title 24, Part 5) § 304.1 · Effective January 1, 2026 · Official source: Building Standards Commission
Plumbing fixtures, drains, appurtenances, and appliances, used to receive or discharge liquid wastes or sewage, shall be connected properly to the drainage system of the building or premises, in accordance with the requirements of this code.
Exception: [HCD 1] Limited-density owner-built rural dwellings. Where conventional plumbing, in all or in part, is
installed within the structure, it shall be installed in accordance with the provisions of this code. Alternative materials and methods shall be permitted provided that the design complies with the intent of the code, and that such alternatives shall per- form to protect health and safety for the intended purpose.
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