The AWWA estimates that 27 percent of indoor water use in a typical single family home is used through the toilet. Installing a high-efficiency toilet (HET, 1.28 gallons or less per flush) will save 20 percent more water than a low-flush toilet (1.6 gallons per flush). The HET rebate program offers residential customers $175 per toilet for the conversion to the most efficient toilets on the market today.
A WaterSense labeled toilet fact sheet
What is the WaterSense HET specification?
The water-efficiency component of the HET specification establishes a maximum effective flush volume of 1.28 gallons per flush for all HETs. This value represents a 20 percent reduction from the current 1.6 gallons per flush standard. Under this specification, an HET can meet the effective flush volume criteria by two ways:
- Single flush toilets must use 1.28 gallons per flush or less; or
- Dual flush toilets must have a full flush of no more than 1.6 gallons per flush and a reduced flush of no more than 1.1 gallons per flush.
For more information on the WaterSense tank-type high-efficiency toilet specification, visit WaterSense's final specification
for high-efficiency toilets.