It's right at the edge of the coast, and it was designed to purify tons of water at a time, and the water that it purifies goes into the capital wasteland.. I think, i don't really know the geography that well.
Man trying to sneak and not kill anything on very hard is pretty fun for me, if anyone else wants to get the bare minimum kills you should do it on the hardest difficulty.
A tool is a tool regardless. I mean if you suck, you suck, and not even the most perfect tool could save you. And if your damn good then even with the worst tool ever conceived you could chug out some high quality shit.