Original Poster here - thanks! Any recommendations on someone who can fix this?

It costs between 800 and 1100 bucks depending on how your house is laid out (do you have a crawl space; is there gravel under your basement slab, etc.)

Has anyone conducted radon remediation on their home? I just got test results that showed our home is on the border of the risky level. I would love recommendations of a contractor and a ballpark of how much it costs. Thanks!