Like many things with California, sensible policies that are very effective and will eventually be standard in other states are presented incorrectly for many different (usually financial) reasons in order to turn public opinion against them to delay their spread.

Commercial/industrial properties are not permitted to water grass lawns with drinkable water.

Commercial/industrial properties are not permitted to use drinkable water to water lawns within 48 hours of 1/4" of rainfall.

Commercial/industrial properties are not permitted to use drinkable water to water lawns with so much water that it runs off the lawn into streets or storm drains.

https://www.waterboards.ca.gov/conservation/regs/docs/2023/F...

Landscaping businesses and landscaping supply retailers launched a campaign several years ago framing the above as "watering lawns and plants is going to be banned in much California".

It appears that campaign was partially successful.

Commercial/industrial properties can install water recycling systems and use all of the greywater they can get to water their lawns.

There are additional local restrictions that depend on the severity of the water supply situation but those are too numerous to list, but at worst none of them prevent weekly watering of plants and lawns adjacent to dwellings.