I'm afraid that if you want to be in the 'mountain region' of PA (I presume you basically just mean the north/north-central part of the state?), you're going to have to contend with fracking wells now and for a long time coming. Honestly you should either find a way to convince yourself that it's okay to live around them, or else just don't live in that type of area.

I can't speak to which towns are good or bad to live in--not really an area of the state that I know well on that level.