In my experience, with a family of 4, a lawned landscape is gonna take up about 50-70% of your water use in SoCal. This is based upon living in a couple of places down here.
Also, pools are a giant red herring. A noncovered pool would take up about 5% of that above water budget. Once you cover it it consumes basically no water (once filled).
Note that drought tolerant grasses use upwards of 60% less water than standard lawns. And subsurface irrigation uses upwards of 70% less water. Still not a good idea to have tons of the stuff, but if you want a small patch of it you can do so without blowing the water budget. Most people don't do this though.
I live in New England and haven't watered my lawn since it was established and rarely water gardens. Even if things can get a bit brown during the summer, they come back.
I mean, if you are able to keep your water use that low, congrats and keep it up. We could all use more people like you. In reality, I'm guessing you are using a bit more than that however.