Multiple choice general knowledge How much water is used to flush the average toilet? 2 gallons 1 gallon 3 gallons 4 gallons <1gallon Reveal answer Fill a bubble to check yourself C Correct answer Explanation Traditional toilets use approximately 3-5 gallons per flush, with 3 gallons being the standard average for older models. Modern low-flow toilets use less, but the question asks about the average toilet.