How old is your laundry machines, and dishwasher? Older use more water. - fairly new (< 5 years)
Do you use muni water for irrigation? - Yes
Toilets, low flush toilets does exist, but get a decent one - have the 1/2 dot flush system, mostly use the single dot (half-flush)
Do all 6 persons shower, or do they bath. My daughter bath's, but my wife amd I shower - 5 shower, 1 bath (year old)
Can something be leaking that only leaks when in use? - one outside tap leaks a little bit, but it's basically just a tiny bit on the floor