how many gallons of water is needed to flush a toilet
The standard is 1.6 gallons for new toilets. They do make power flush toilets that have an air system added to them but use the same amount of water. If you feel you need a toilet that will flush 16 golf balls, you probably need a doctor more than a plumber. sensible_man Â· 10 years ago.
Modern low-flush toilet designs allow the use of much less water per flush â4.5 to 6 liters (1.2 to 1.6 U.S. gal) per flush. Some users do not flush their toilets after urination in order to save water.
Old toilets 5.5 gallons, the minimum on new ones is 1.6 gallons.