That definitely feels high, mine is a household of two but I know exactly how much water I use because I'm off grid and I have to go haul it myself from the city my tank on my trailer holds 275 gallons and that's generally enough to last me anywhere between a week to two weeks depending on how much laundry I need to do.

I shower daily, do dishes all the usual stuff so what the fuck is the average family doing with all that water that they are using more in a day than I do in a week