Low-Flow Toilets

Dual-flush toilets are technically high-efficiency models that save water by offering two separate flushing modes—one for solid waste, and one for liquid. The liquid half-flush option uses just 0.8 to 1.1 gallons of water per flush. The Australian company Caroma, considered an industry leader in the manufacturing of dual-flush toilets, first introduced their models in the 1980's. Australia confronts its water shortfalls by mandating the use of dual-flush toilets nationwide.

In the U.S., California may mandate the use of HETs in all new construction, a move that reflects the state's concern over water conservation. “We expect that at some point HETs will become the norm, and we are developing products that offer consumers a wide range of options within the water-efficient categories,” says Zimmerman. Programs like the EPA's WaterSense and water conservation bills like those in California raise the bar for water-saving toilets, so consumers can expect more models and water-saving technologies in the future.