Cost for Septic System and Well

Hey folks I'm hoping to build a barndominium in the Nashville area. Property is very pricey there and we all know how the cost for everything has basically doubled from 3 years ago. Because of this I now have to watch my budget for a piece of property VERY carefully. Can anyone give me a good idea about the cost of a septic system and a well in TODAY'S money. Or either if you built 3 or 4 years ago how much it cost you then, and I suppose I will double that amount. Yeah I looked online and got some numbers but I'm way more comfortable getting actual data from actual like-minded people. Thanks in-advance ! -Mitch