Tucson Water has a great program where they will send out one of their representatives and do a thorough analysis of your property. It's free, they'll do some minor repairs for you, and it will save you money. I had it done a couple years ago and was very impressed. They even put some new parts in my toilets and on my faucets. They won't do anything you don't want them to do, they only offer suggestions. It says the appointments last for two hours, but more realistically it's like 45 minutes.
Tucson Water—Residential Water Use Analysis