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Earlier editions: 20222019

Chapter 15 — ALTERNATE WATER SOURCES FOR NONPOTABLE APPLICATIONS

1501.9 Signage — 2025 California Plumbing Code

California Plumbing Code (Title 24, Part 5) · 2025 edition · updated 2026-09-25 · 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) § 1501.9 · Effective January 1, 2026 · Official source: Building Standards Commission

[BSC-CG, HCD 1, HCD 2 & HCD 1- AC] Signage for on-site treated nonpotable gray water shall comply with Sections 1501.9.1 and 1501.9.2. [DWR] Signage for reclaimed (recycled) water shall comply with Section 1505.13.

1501.9. 1 Commercial, Industrial, Institutional , and Residential Restroom Signs. A sign shall be installed in restrooms in commercial, industrial, and institutional occupancies and in residential common use areas using on-site treated nonpotable gray water, for water closets, urinals, or both. Signs shall comply with all applicable requirements of the California Building Code. Each sign shall contain 1/2 of an inch (12.7 mm) letters of a highly visible color on a contrasting background. The location of the sign(s) shall be such that the sign(s) are visible to users. The location of the sign(s) shall be approved by the Authority Having Jurisdiction and shall contain the following text:

“TO CONSERVE WATER, THIS BUILDING USES ON-SITE TREATED NONPOTABLE GRAYWATER TO

FLUSH TOILETS AND URINALS.”

1501.9. 2 Equipment Room Signs. Each room containing on-site treated nonpotable gray water equipment shall have a sign posted in a location that is visible to anyone working on or near nonpotable gray water equipment with the following wording in 1 inch (25.4 mm) letters:

“CAUTION: ON-SITE TREATED NONPOTABLE GRAY-

WATER, DO NOT DRINK. DO NOT CONNECT TO DRINKING WATER SYSTEM. NOTICE: CONTACT

BUILDING MANAGEMENT BEFORE PERFORMING

ANY WORK ON THIS WATER SYSTEM.”

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▸Contents — California Plumbing Code (Title 24, Part 5)
California Plumbing Code (Title 24, Part 5)

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