First recognize that fields can very greatly, a place like South Texas Eagle Ford uses far more water than most other hydraulic fractured wells.
Secondly, a golf course in Southern California uses far more water than other, wetter, locations.
So this isn’t an apples to oranges comparison, it can be apples to aircraft carrier comparison.
So with those qualification, I still don’t know. I haven’t found the way source for how many wells were hydraulically fractured in California during 2013.
But according to the Forbes article, one golf course there equals all of the fracked wells there.
For data on fracking wells in California go to DOGGR database at the California Dept. of Conservation.
The last time I checked California had a puny 501 fracking wells, all in Kern County in a very confined area far away from most water basins used for domestic water supply.
501 wells sounds like a lot but compared to other states it is a very tiny percentage.