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Estimates vary, but, on average, each person uses about 80-100 gallons of water per day, for indoor home uses. Are you surprised that the largest use of household water is to flush the toilet, and after that, to take showers and baths?
Each American uses an average of 82 gallons of water a day at home (USGS, Estimated Use of Water in the United States in 2015). We can all use at least 20 percent less water by installing water-efficient fixtures and appliances.
The Water Calculator estimates household water use, and compares your home to both a typical household and an efficient household in your zip/postal code. The calculator also estimates your carbon footprint from hot water consumption, and helps identify specific strategies for improving overall household water efficiency.
The average daily indoor water use per household (averaging 2.65 people in the North American sample) ranged from zero to 644 gphd (gallons per household per day) and averaged 138 gphd, with standard deviation of about 80 gphd (or 521 liters per day and standard deviation of 300 liters). [1]
The average American uses around 82 gallons per day per person in the household. That means a family of four would use around 10,000 gallons in a 30-day period. But usage varies a great deal across the country, mostly because of differences in weather patterns.
Each day in the United States, about 27.4 billion gallons of water are withdrawn and delivered from surface water and groundwater sources for residential use, which includes water for drinking, washing clothes, flushing toilets, watering lawns, and more.
The average American family uses more than 300 gallons of water per day at home. Roughly 70 percent of this use occurs indoors. Nationally, outdoor water use accounts for 30 percent of household use yet can be much higher in drier parts of the country and in more water-intensive landscapes.
Domestic water use includes indoor and outdoor uses at residences, and includes uses such as drinking, food preparation, bathing, washing clothes and dishes, flushing toilets, watering lawns and gardens, and maintaining pools.
Domestic water use in the United States. Every five years, water withdrawal and use data at the county level are compiled into a national water-use data system, and state-level data are published in a national circular. Access the most recent domestic data, maps, and diagrams.
However, from a broader perspective, residential use accounts for less than 8 percent of the 355,000 million gallons of water used per day in the U.S. On average, a housing unit uses 260 gallons of water per day. The amount of water used per home varies considerably from state to state.