1940 – 1960 – 5 Gallons per flush toilets
1960 – 1975 – 3.5 Gallons per flush toilets
1975 – 1990 – 2.5 Gallons per flush toilets
1990 – 2014 – 1.6 Gallons per flush toilets
And as of 2017, one can only purchase 1.28 Gallons per flush toilets in the state of California. These are considered ‘ultra low’ flow toilets. Currently one can purchase 1.1 GPF and less custom toilets also.
Call us with any questions you may have at 310-800-4418