Not that there's much of a San Joaquin Valley aquifer left to ruin by fracking, but politics and the sheer cost of trying to do business in California should mean the Monterrey Shale will be held in reserve. (Personally, I think I'd rather eat California produce than have cheap gas for driving around on foraging expeditions/pantry raids.)
Great piece from Mercury News on SJV water here: http://www.mercurynews.com/drought/ci_25447586/california-dr...
Tip of the research iceberg on the obvious: http://www.scientificamerican.com/article/groundwater-contam...