Seems oddly precise to have the law limit the amount of water used in toilet flushing to 1.6 gallons. Where did 1.6 come from? What not a nice round number such as 1.5 gallons?
The odd number comes from the origins of low-flow toilets. 1.6 gallons equals 6 liters, the amount of water commonly used in toilets across Europe and Asia at the time the US Energy Policy Act of 1992 was in development.
Source: SafePlumbing.org by the Plumbing Manufacturers Institute.
Tags: EPAct 1992, low-flow toilets


