Toilet-Flush Water in the U.S.

The estimate of about 5.7 billion gallons a day for toilet flushing in U.S. homes comes from a calculation using roughly five flushes per person and about 18.5 gallons per day. It should not be treated as a precise current national measurement: use varies with toilet design and behavior, and EPA estimates that toilets account for about 25–30% of household water use.