I live in central N.C. Because of a higher incidence of radon here, our county's(Guilford) Environmental Health Dept. offered radon testing for free. Our first test came back high. We were on vacation (doors staying shut) during the 2nd test and it was higher. If I remember right, I was still not convinced and purchased a more expensive test (longer term) to confirm the bad news.
Well, the fix wasn't all that bad. We found a book entitled "Protecting Your Home from Radon - A Step-By-Step Manual for Radon Reduction". My husband did this project himself. It basically involved cutting a hole in the concrete floor and in the wall. Between the two is a pipe. Where the pipe goes to the outside there is a fan (outside) that runs continually to pull air out from under the basement.
The real down side is that we heat with wood. Pulling cooler air under the basement floor in the winter causes us to burn much, much more wood. I do have young children and was concerned for their health more so than my own. My parents who live next door also had a radon test that came back positive. I think that they think I'm crazy. They have chosen not to do anything about it. They built the house new about 46 years ago. They've live in it all this time and I think healthwise they are doing very well for their age. They can work circles around me. They are in their early seventies.
In September of 2000, the fan system costs us just under $400 (not including pipe, drill bits, labor). The fix was simple but not necessarily easy. Cutting through the concrete and cement block was not easy. I can't remember if my husband used tools we had or rented tools. Perhaps different tools could have made the job easier. Check out the website
www.radonpds.com. This is where we ordered the fan. It quit after about 3 months. They replaced it no charge for which we were very thankful. We found them to be good people to deal with.
I hope you don't have a radon problem but I think it's worth testing especially if other houses in the area are known to have radon. I see where the company is now selling a mat you can put under the concrete for new construction.
Good luck to you!
Mel in N.C.