As long as it has fresh water that is potable, or that can be rendered potable fairly easily, you've got a good place. Since municipal water treatment would quickly fail without maintenance, that probably means relying on a natural source, be it a river or a well.

After that all you need is a defensive barrier, a food supply, and a deck of cards.

TZ
TexasZombie
http://www.geocities.com/eviloverlord668/afmain.htm
http://www.geocities.com/Area51/Vault/9327/main.html

That which does not destroy me has made a very grave tactical error...