Los Altos Municipal Code Ch. 12.14 Plumbing Code

The 2025 California Plumbing Code, contained in California Code of Regulations, Title 24, Part 5, which incorporates and amends the Uniform Plumbing Code 2024 Edition, published by the International Association of Plumbing and Mechanical Officials, with amendments and certain appendices set forth in Section 12.12.020 is hereby adopted. One (1) copy of said code is on file for use and examination by the public in the Development Services Department of the City of Los Altos.

(Ord. No. 2025-542, § 4, 10-28-2025)

The 2025 California Plumbing Code referred to in Section 12.12.010 is adopted with the following amendments and certain Appendix Chapters as follows:

A.

Section 710.1 is deleted and replaced to read as follows, based upon the finding of express necessity set forth in Section 8.B.1 of this Ordinance.

B.

Drainage of Fixtures Located Below the Next Upstream Manhole or Below the Main Sewer level.

710.1 Backflow Protection All new, replaced, or repaired building sewers, both public and private, requiring sewer connections to the City main sewer system shall be protected from backflow of sewage by installing

an accessible approved type of backwater and atmospheric relief valve. Cleanouts for drains that pass through a backwater valve shall be clearly identified with a permanent label stating, "backwater valve downstream." Building sewers shall have an atmospheric relief valve installed upstream of the backwater valve outside the building in close proximity to the foundation.

Exception: Sewer repairs where there is no existing cleanout located at or near the building foundation, may have these atmospheric relief devices placed near the repair upstream of the newly installed backwater valve.

C.

Chapter 12 Section 1211.8 is amended to read as follows, based upon express finding of necessity set forth in section 8.B.2 of this Ordinance.

automatically shut off the gas at the location of the valve in the event of a seismic disturbance and certified by the State Architect as conforming to California Code of Regulations, Title 24, Part 12, Chapter 12-16-1, shall be installed in all new buildings, and when reinstalling meters at the same location, and when relocating gas utility meters. Said gas shutoff valves shall be at or near the meter supplying gas to individual buildings.

D.

Only the following Appendix Chapters from the Plumbing Code are adopted:

Appendix A, Recommended Rules for Sizing the Water Supply System.

Appendix B, Explanatory Notes on Combination Waste and Vent Systems.

Appendix D, Sizing Storm Water Drainage Systems.

Appendix H, Private Sewage Disposal Systems.

Appendix I, Installation Standard for Pex Tubing Systems for Hot and Cold-Water Distribution.

(Ord. No. 2025-542, § 4, 10-28-2025)