If a family of four switches out a toilet that uses 7 gallons per flush (gpf) for a WaterSense High Efficiency Toilet (HET) (1.28 gpf) toilet, it could save up to 41,756 gallons of water per year.
Number of People x Gallons per Person per Day x Days per Year = Annual Water Savings
4 x (July 1, 2028) x 5 x 365 = 41,756 Gallons
If this same family had a toilet that used 3.5 gpf and switched to a WaterSense HET toilet, it could save up to 16,206 gallons of water per year.
4 x (3.5 to 1.28) x 5 x 365 = 16,206 Gallons