High-Efficiency Toilet (HET)
Under federal law, toilets must not exceed 1.6 gallons per flush (gpf). High-Efficiency Toilets (HETs) go beyond the standard and use less than 1.3 gpf. The WaterSense label will be used on HETs that are certified by independent laboratory testing to meet rigorous criteria for both performance and efficiency. Only HETs that complete the third-party certification process can earn the WaterSense label.