How much water does the average American use per day?

Answer 1

Municipal planners assume each individual (regardless of whether or not it is a family) uses about 150 gallons of water a day. They also assume that about 100 gallons of that enters the sewer system in that day.
Each person uses about 80-100 gallons of water per day. So it depends how many people in the family.
Each person uses 80-100 gallons of water per day.

Answer 2

According the U.S. government, the average American uses between 80 and 100 gallons of water every day. Most of this water is used to flush toilets and to take showers and baths.

Answer 3

20 gallons a day.