Residential Bath Use
The size of the bathtub, and the level to which the user fills the tub, both affect the amount of water used. With the exception of whirlpool and jetted tubs, the size of standard bathtubs in North America has generally decreased over time. The typical modern (non-jetted) bathtub today holds about 25 to 45 gallons (100 to 170 litres) of water depending upon the fill level. While a bather who fills the tub half-way will consume about 20 gallons (75 litres), bathers that fill the tub up to (or exceeding) the overflow outlet will use 40 to 50 gallons (150 to 200 litres).