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A low-flush toilet (or low-flow toilet or high-efficiency toilet) is a flush toilet that uses significantly less water than traditional high-flow toilets. Before the early 1990s in the United States, standard flush toilets typically required at least 3.5 gallons (13.2 litres) per flush and they used float valves that often leaked, increasing their total water use.
In the United States, the Energy Policy Act was signed into law in 1992 and took effect in 1994, requiring that toilets sold use no more than 6 litres (1.6 US gal) per flush. Fixtures that use a maximum of 20% less than the federally mandated maximum of 6 litres (1.6 US gal) receive the WaterSense label, a US Environmental Protection Agency ...
EPACT92 mandated new volume-based efficiency standards for toilets, showerheads and faucets as follows: toilets must be manufactured with a maximum flush volume of 1.6 gallons per flush (gpf); showerheads must be manufactured with a flow rate of 2.5 gallons per minute (gpm) at 80 pound-force per square inch (psi); and faucets must be ...
Future reduction in toilet end use will occur as more homes use low-flush toilets (1.6 gpf, or 6 lpf) mandated by the 1992 Energy Policy Act, or high efficiency toilets (1.28 gpf or 4.85 lpf) which meet the EPA WaterSense specifications. A recent study shows that about 21 percent of all toilets in 5 states (Arizona, California, Colorado ...