Chapter 16 — NONPOTABLE RAINWATER CATCHMENT SYSTEMS
1603.4 Minimum Water Quality — 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) § 1603.4 · Effective January 1, 2026 · Official source: Building Standards Commission
The minimum water
Marking Information. Rainwater catchment systems shall
quality for harvested rainwater shall meet the applicable water
have a colored background in accordance with Section 601.3.
quality requirements for the intended applications as deter Rainwater catchment systems shall be marked, in lettering in
mined by the Authority Having Jurisdiction. In the absence of
accordance with Section 601.3.3, with the words: “CAU water quality requirements determined by the Authority Hav TION: NONPOTABLE RAINWATER, DO NOT DRINK.”
ing Jurisdiction, the minimum treatment and water quality
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