1904 

2 gallons of water per flush

A surprisingly low gpf, for the era. Gravity did all the work for these early models.

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1930's 

8 - 10 gallons of water per flush

As styles changed, the standard was having the tank sit directly on the back of the bowl.

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1970's 

3.5 gallons of water per flush

The Wellworth® Water-Guard toilet reduced water use to 3.5 gallons per flush.

 
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1980's 

1.6 gallons of water per flush

In 1989, Kohler introduced Wellworth® Lite featuring a 1.6 gallons flush.

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1990's 

1.6 gallons of water per flush

In 1991, Pressure Clean toilets first appeared, using only 1.0 to 1.4 gallons of water.

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2000's 

1.28 gallons of water per flush

In 2007, the WaterSense Toilet Standard was established. We offer a variety of technologies that use 1.28 gallons per flush.