Fixtures & Water HeatersQuestion 189 of 360
Under current California requirements, a new residential water closet may use a maximum flush volume of:
a.3.5 gallons per flush
b.2.2 gallons per flush
c.1.6 gallons per flush
d.1.28 gallons per flush
Explanation
New water closets in California are limited to a maximum of 1.28 gallons per flush, a high-efficiency standard also reflected in CALGreen. Older 1.6-gpf and 3.5-gpf models are no longer compliant for new installations. The lower flush volume conserves water while still clearing the bowl.
Law Reference: 2022 California Plumbing Code (CPC) §411.2Practice all 360 questions free — no signup required.
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