Chapter 15 — ALTERNATE WATER SOURCES FOR NONPOTABLE APPLICATIONS
1506.1 General — 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) § 1506.1 · Effective January 1, 2026 · Official source: Building Standards Commission
The provisions of this section shall apply to the installation, construction, alteration, and repair of onsite treated nonpotable gray water systems intended to supply uses such as water closets, urinals, trap primers for floor
drains and floor sinks, above and belowground irrigation, and other uses approved by the Authority Having Jurisdiction.
Other approved nonpotable water sources including swim- ming pool backwash operations, air conditioner condensate, rainwater, cooling tower blow-down water, foundation drainage, steam system condensate, fluid cooler discharge water, food steamer discharge water, combination oven dis- charge water, industrial process water, and fire pump test water may be permitted to be collected for re-use by gray water sys- tems, as approved for the intended application.
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