For well info, you can search the Oregon Department of Environmental Quality website, which has all modern well logs (and some older ones) on line:
Well Log Query
You'll need to know Township, Range and lot numbers (should be right on your property assessment and deeds). Wells will vary with terrain and geology, so what someone right next to you ha may or may not be indicative of where you'll find water.
For the County Planning Dept (building permits, etc)
Klamath County Community Development - Building Division
The County's not too bad, and they are pretty quick about getting permits turned and inspections done. They do follow current Building Codes, though.