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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.

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13y ago

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