Thanks for your question! I hate to sound vague but, as the other agents have mentioned it varies a great deal on location, depth, type of rock, soil, etc. I would be happy to give you the names of a couple of good companies I have used in the past as referrals for you. Also, you can go to Spokane County.gov website and look for well log reports in the area you are thinking about, this is very useful and informative. It will give you an idea of what you might expect for your potential property if an adjacent property has their well log info posted. Please feel free to contact me at the website listed below for anything I can help you with. Best of wishes and take care! Most Sincerely, Chris Warmuth of Windermere/North Spokane, WA.