Chapter 4 — PLUMBING FIXTURES AND FIXTURE FITTINGS
411.2 Water Consumption — 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) § 411.2 · Effective January 1, 2026 · Official source: Building Standards Commission
The effective flush volume of all water closets shall not exceed 1.28 gallons (4.8 L) per flush when tested in accordance with ASME A112.19.2/CSA B45.1 . 411.2.1 Dual Flush Water Closets. Dual flush water closets shall comply with ASME A112.19.14. The effective flush volume for dual flush water closets shall be defined as the composite, average flush volume of two reduced flushes and one full flush.
411.2.2 Flushometer Valve Activated Water Clos-
ets. Flushometer valve activated water closets shall have a maximum flush volume of 1.28 gallons ( 4.8 Lpf) of water per flush.
411.2.2.1 Flushometer Valve Activated Water Closets. [BSC-CG & DSA-SS] Flushometer valve activated water closets shall have a maximum flush volume of 1.28 gallons (4.8 L) per flush in accordance with ASME A112.19.2/CSA B45.1.
411.2.3 Performance. [HCD 1 & HCD 2] Water clos- ets installed in residential occupancies shall meet or exceed the minimum performance criteria developed for certification of high-efficiency toilets under the WaterSense program sponsored by the U.S. Environ- mental Protection Agency (EPA).
411.2.4 Water Closets. [BSC-CG & DSA-SS] The effective flush volume of all water closets shall not exceed 1.28 gallons (4.8 L) per flush. Tank-type water closets shall be certified to the performance criteria of the U.S. EPA WaterSense Specification for Tank-Type Toilets in compliance with Chapter 5, Division 5.3. of the California Green Building Standards Code (CALGreen).
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