Answer:
Average AMERICAN: showers, flushes, brushing teeth, cleaning clothes, washing dishes & cars. A true average includes people who water lawns AND water wastage.
National Geographic magazine says
"AMERICANS USE ABOUT 100 GALLONS OF WATER AT HOME EACH DAY"
It also says:
"MILLIONS OF THE WORLDS POOREST SUBSIST ON FEWER THAN FIVE GALLONS"
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One person uses about 15-42 gallons of water everyday it just depends how long the person takes in the shower etc.