average amount of water used per house hold
The average American family of four uses 400 gallons of water per day. On average, approximately 70 percent of that water is used indoors, with the bathroom being the largest consumer (a toilet alone can use 27 percent!).
An often-cited 2011 study of California single-family water consumption estimated that the average California household used more than 360 gallons of water per day. To put that in perspective, the typical office water cooler holds 5 gallons, or about 1.4 percent of the studyâs estimated daily average household use. Given that figure, the average house in California would need to use 72 fewer gallons a day to meet the 20 percent reduction goal.