This already happens. Las Vegas has restrictions on this. LA does too. Additionally, just looking at the LA water rates [1] you see that depending on the size of the lot, you get a tiered water pricing depending on your usage. Put another way: the more water you use the more each unit of water costs you.

So you can have a big non-native lawn but it's going to cost you. Personally, I'm completely fine with that. Outright prohibition seems unnecessary.

[1]: https://www.ladwp.com/ladwp/faces/ladwp/residential/r-custom...

These are done on a much smaller scale. It’s fun to blame people in a way that shames them, but it doesn’t always match reality. There is a whole lot of foolish water allocation to agriculture which should never have been done in the first place that just needs to stop. The sector needs to shrink to manageable levels.

Agricultural water use is something like 4x urban water use in California. There just needs to be less of it, and exporting heavy water using crops needs to be carefully considered.

They do require water (some lawns are watered in the form of irrigation; some aren't). But if you look at the water usage statistics, agriculture uses far more than homes (including their lawns). So if you want to do something about water use, it makes more sense to go after agriculture, because that's where the most use is.

Are you prepared to regulate individual homeowner's yards?