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Well, considering that you don't turn on the water while you're brushing, and only turn it on to fill your cup, and rinse your toothbrush, I would say probably 1-2 gallons wasted. Of course, this is only an estimate, and I can't back this up with statistics and such, but I'm sure this is somewhere close to a definite answer. :)

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13y ago
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9y ago

When a person brushes their teeth and leaves the bathroom faucet running it can waste up to 2.5 gallons of water per minute. A shower will also use about 2.5 gallons of water per minute.

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12y ago

one gallon which is a 4 quarts :)

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Q: How many gallons of water are wasted by leaving the sink on for one minute?
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