In the UK the regulations state 9 litres which is about 2.3 gallons US.
The toilet uses about 1.6 gallons per flush.
3.4 gallons it's the new standard
99908977t
over 1,000 gallons
Old toilets 5.5 gallons, the minimum on new ones is 1.6 gallons
1.6
About 1.6 gallons per flush
Modern toilets use 1.6 gallons of water to flush and older models used 3 gallons
A standard 1999 toilet tank typically holds around 1.6 gallons of water. However, older models may vary in capacity, ranging from 3.5 to 5 gallons per flush.
It depends on what type of toilet you have. If you have an older toilet than, it may hold more than a newer toilet holds.
Flushometer or tank and bowl?
It takes approx 2 to 5 gallons of water. Depending on the age of the toilet and the type of flush you have.