Ch. 3 General Regulations — 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) Chapter 3 · Effective January 1, 2026 · Official source: Building Standards Commission
(Matrix Adoption Tables are non-regulatory, intended only as an aid to the code user. See Chapter 1 for state agency authority and building applications.)
| Adopting Agency | BSC | BSC-CG | SFM | HCD 1 | HCD 2 | HCD 1-AC | DSA AC | DSA SS | DSA SS/CC | OSHPD 1 | OSHPD 1R | OSHPD 2 | OSHPD 3 | OSHPD 4 | OSHPD 5 | OSHPD 6 | BSCC | DPH | AGR | DWR | CEC | CA | SL | SLC |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Adopt Entire Chapter | X | X | X | |||||||||||||||||||||
| Adopt Entire Chapter as amended (amended sections listed below) | X | X | X | X | X | X | X | X | X | |||||||||||||||
| Adopt only those sections that are listed below | ||||||||||||||||||||||||
| Chapter/ |
||||||||||||||||||||||||
| 301.3 | X | |||||||||||||||||||||||
| 301.3.1 | † | † | ||||||||||||||||||||||
| 301.3.1.1 | † | † | ||||||||||||||||||||||
| 301.3.1.2 | † | † | ||||||||||||||||||||||
| 301.4.1 | X | X | ||||||||||||||||||||||
| 301.7 | X | |||||||||||||||||||||||
| 301.8 | X | |||||||||||||||||||||||
| 303.1 Exception | X | |||||||||||||||||||||||
| 304.1 Exception | X | |||||||||||||||||||||||
| 310.11 | X | X | X | X | X | |||||||||||||||||||
| 310.12 | X | X | X | X | ||||||||||||||||||||
| 310.13 | X | |||||||||||||||||||||||
| 310.14 | X | X | X | X | ||||||||||||||||||||
| 310.15 | X | X | X | |||||||||||||||||||||
| 311.1 Note | X | X | ||||||||||||||||||||||
| 312.2 | X | X | ||||||||||||||||||||||
| 312.7 | X | X | X | |||||||||||||||||||||
| 312.11 | X | X | ||||||||||||||||||||||
| 313.8 | X | X | X | X | X | |||||||||||||||||||
| 321.0 | X | X | X | X | X | |||||||||||||||||||
| 322.0 | X | X | X | X | ||||||||||||||||||||
| 323.0 | X | X | X | X | X |
This state agency does not adopt sections identified with the following symbol: The Office of the State Fire Marshal’s adoption of this chapter or individual sections is applicable to structures regulated by other state agencies pursuant to Section 1.11.0.
CHAPTER 3
GENERAL REGULATIONS
301.0 General.¶
302.0 Iron Pipe Size (IPS) Pipe.¶
303.0 Disposal of Liquid Waste.¶
304.0 Connections to Plumbing System Required.¶
305.0 Damage to Drainage System or Public Sewer.¶
306.0 Industrial Wastes.¶
307.0 Location.¶
308.0 Prohibited Locations.¶
309.0 Workmanship.¶
310.0 Prohibited Fittings and Practices.¶
311.0 Independent Systems.¶
312.0 Protection of Piping, Tubing, Materials, and Structures.¶
Structures.
313.0 Hangers, Supports, and Anchors.¶
314.0 Trenching, Excavation, and Backfill.¶
315.0 Joints and Connections.¶
316.0 Increasers and Reducers.¶
317.0 Food-Handling Establishments.¶
318.0 Test Gauges.¶
319.0 Medical Gas and Vacuum Systems.¶
320.0 Rehabilitation of Piping Systems.¶
321.0 Essential Plumbing Provisions. [OSHPD 1, 2, 3 (Surgical Clinics), 4 & 5]¶
(Surgical Clinics), 4 & 5] During periods of power out- ages essential electrical power shall be provided for the fol- lowing equipment:
(1) Domestic water booster pumps.
(2) Domestic hot water circulating pumps.
(3) Sewage ejector pumps.
(4) Sump pumps and drainage pumps.
(5) Domestic water heating equipment and their controls.
(6) Fuel pumps.
(7) Grease removal devices requiring electrical power.
(8) Domestic hot water high temperature alarm.
322.0 Psychiatric Services. [OSHPD 1, 2, 4 & 5]¶
For projects associated with provision of psychiatric services in acute psychiatric hospitals, general acute care hospitals, and special treatment program service units in skilled nursing facilities, special design considerations for injury and suicide prevention shall be given to shower, bath, toilet, and sink plumbing fixtures. Shower heads shall be of flush-mounted design to minimize anchor points.
323.0 Plumbing Equipment Schedules. [OSHPD 1, 2, 3, 4 & 5]¶
3, 4 & 5] Plumbing equipment schedules shall clearly indi- cate which equipment will be on essential power or appro- priate special seismic certifications.
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