Deep groundwater takes decades to infiltrate. You can pump water underground, but the aquifers that have been depleted are porous formations and there's significant evidence in central California that aquifer depletion has resulted in sinkage, which means that space may no longer be available.

Fracking is the result of injecting liquid underground which fractures the porous formation and releases held oil or gas. These are different, and usually much deeper, formations than the formations that can hold potable aquifers.

Similarly, CO2 sequestration is done in very deep formations (typically around 2km below surface in my experience). This deep earth activity does not simulate subsurface potable water aquifers due to the difference in strata and pressure.