1603.3 Rainwater Catchment Collection Surfaces — 2025 California Plumbing Code

California Plumbing Code (Title 24, Part 5) · 2025 edition · updated 2026-10-23 · 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) § 1603.3 · Effective January 1, 2026 · Official source: Building Standards Commission

Rainwater shall be collected from roof surfaces or other impervious manmade, aboveground collection surfaces.

1603.3.1 Other Surfaces. Natural precipitation col- lected from surface water runoff, vehicular parking sur- faces, or manmade surfaces at or below grade shall be in accordance with the water quality requirements for on- site treated nonpotable gray water systems in Section 1506.0.

Exception: Collected rainwater or storm water used exclusively for subsurface landscape irrigation.

1603.3.2 Prohibited Discharges. Overflows and bleed-off pipes from roof-mounted equipment and appli- ances shall not discharge onto roof surfaces that are intended to collect rainwater without prior approval from the Authority Having Jurisdiction.

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

California Plumbing Code (Title 24, Part 5)

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