Water usage isn't an environmental issue. There's as much water now as there ever was, barring a few hundred litres aboard the ISS.

The issue is that you want to live in a desert but with a lifestyle like you're not in a desert.

The hard conversation you need to have is that California is not habitable. There's no water and there's nowhere to grow food. If you want to make it habitable you'll need to turn all those golf courses into farms, raise cows on them, plant more trees, and try to expand those green areas as much as you can.

If you want to live in a green city, move to Glasgow, where there's loads of water and because it never gets above about 25°C or below about 5°C it's t-shirt weather all year round and you don't need to refrigerate your house.