It all comes down to location. In Madera, California, the water district actually provides a higher rebate for artificial turf than for other options. But in Southern California, the giant SoCal Water$mart program explicitly forbids rebates for synthetic grass.
For anyone installing artificial grass in Las Vegas, the local Water Smart Rebate Program offers excellent opportunities. Las Vegas Valley Water District residents can get up to $5 per square foot for replacing grass. But there is one catch to be aware of: your entire project must meet the 50% plant canopy rule, meaning half of your new yard must be covered by living plants.
The Southern Nevada Water Authority is your ultimate source of truth for local eligibility requirements.