Lewellen - There are two sides to this story and you may only be getting information from one. Water withdrawals are regulated and have been halted in many areas due to lack of rainfall. There have been several suspected issues with ground water pollution but the recently published EPA test results haven't found the issues to be caused by fracking. Methane migration has occurred but that isn't due to fracking.
There certainly have been drill site accidents and you can see those in this section of the forum. As far as number of drill sites, more gas is produced from each site due to fracking than could be produced with vertical wells. Yes, there are going to be alot of them.