Toilets can account for almost 30% of all indoor water use, more than any other fixture or appliance. Older toilets (installed prior to 1994) use 3.5 to 7 gallons (13-27 liters) of water per flush and as much as 20 gallons (76 liters) per person per day.
Replacing an old toilet with a new model can save the typical household 7,900 to 21,700 gallons (29,902 - 82,135 liters) of water per year, cutting both your water and wastewater bills.
An average of 20% of toilets leak.
Install an ultra low-flow toilet that requires only 1.6 gallons (6 liters) per flush.
To ensure optimal performance, when installing a low-flow toilet in areas with a low drainage gradient (such as basements), consider a pressurized model.
Check toilets periodically for leaks and repair them promptly.
Reduce the amount of water used by an older toilet by placing a one gallon plastic jug of water, or two one quart bottles, in the tank to displace toilet flows.
Consider installing a "dam" that partitions off a section of the tank so it can't fill with water.
These methods can save over 1,000 gallons (3,785 liters) of water per person per year.