Domestic use (lawns, showers, toilets, etc) is a small percent of the overall water use in the west. For example, in Colorado 89% of the water usage is for agriculture and only 7% is municipal and industrial (https://waterknowledge.colostate.edu/water-management-admini...). So, we can rip up as many lawns and install as many low flow toilets and it is barely a drop in the proverbial bucket.