Here is water use by type in So NV.
https://etfdb.com/esg-channel/between-a-desert-and-a-dry-place-las-vegas-and-water/
46% from houses . . . I think they do have to address that. I'm a fan of market-based mechanisms. Maybe they could tier water rates, with prices rising steeply as consumption increases.
(My initial reactions about this, based on what I know about CA and PNW water usage, were wrong. Unlike in CA, agriculture is not a big user in So NV.)