I won't go into all the details here, except to note two extremely important qualifiers:
In other words, don't do anything — don't even shut off your irrigation! — until you've requested an inspection from the County. Otherwise, even if you do the sensible thing and stop watering your lawn because you're just going to replace it with a lovely field of lavender and sage anyhow, you may be ineligible for the rebate. To schedule that all-important pre-inspection, call (800) 548-1882 or sign up online.
Oh, yes, one other important asterisk: "Rebates are available until funds are depleted." In other words, don't wait to get started.
The list of criteria and approved water-wise plants and equipment is a bit mind-bending, so if you'd like any help navigating it all, call your friendly local landscape designer.