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Some info four your comparison:

It takes about 4.7 million gallons of water to frack the average well in the Eagle Ford shale, a vast reservoir containing oil and natural gas that swoops beneath about 26 counties in South Texas. Estimates are that 25,000 wells may be drilled in the Eagle Ford shale over the next 20 years. They’ll require more than 15,000 acre-feet of water per year.

But that total is dwarfed by regionwide water usage, Brownlow said.
The South Texas water-management region that includes Bexar County uses 1.1 million acre-feet per year, while the entire South Texas region uses 4.2 million acre-feet of water per year.

That means that for every 1 acre-foot of water used in fracking, 280 acre-feet will be used for other purposes, he said.

http://fuelfix.com/blog/2011/10/11/water-for-fracking-is-dwarfed-by-other-usage/

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Most people read the numbers of hydraulic fracturing and think that is a overwhelming number. In reality, they have little idea how much fresh water there is and how much we already use. It just is not a significant draw compared to our existing total water usage.