The average American shower will use 17.2 gallons of water. (assuming a 2.1 GMP shower head and 8.2 minute shower)
3 person home will consume 51.6 gallons of shower water per day (assuming that each person only takes one shower per day)
~~19,000 gallons of water per year will flow down the drain.
This is water that can be used to support a lush landscape.