While I do not know the details of this mandated cutback, I'm not a fan of an across the board cut of 25% because that favors the water wasters of yesterday. If you were a pro-active golf course and you upgraded your system and learned to maintain good conditions on less water, you are now punished for those efforts while the clubs that did not go down that road have more water available to them.
With today's technology and research data, we know how much water it should take to grow a grapefruit. If one farmer switched to a targeted approach like drip or bubblers, the 25% cut can kill him, while the flood irrigator can now install more advanced equipment and survive the cut.
Same with golf courses. Cuts should be based on scientific data and it is easily determined. If you have an 90 acre golf course and 100% of ET replacement means you need 400 acre feet of water, you now have 75% or 300 acre ft. You can take out grass, or cut the water in the roughs, or course wide. But it based on scientific data not historical use.