Hello F. - That's a nice looking property; I almost forgot what grass looks like...
I didn't see all the details on the listing- did the listing agent say it needs a radon mitigation system? I assume it has been recently tested? Are the sellers offering to pay for it, or install before a closing?
I've been through it all regarding radon levels and mitigation systems, etc.
The EPA has a SAFE zone, and then a "caution/ marginal" zone, and then also a hazard zone where they strongly recommend a mitigation system being installed. Even their hazard zone can vary from a pretty low number up to a very high and seriously dangerous level. Each house and situation is different.
A few questions, for you to gauge the seriousness of it-
Does anyone in the house smoke? Does anyone have or have they had any cancer?
Are there any infants/ toddlers, or elderly people living in the house?
Do you plan on living/ spending a lot of time in the basement areas (finished family room, etc)?
Those are just some things right from the EPA's site. Hope that helps.
If I can be of any help in your purchase, please let me know. Thanks and good luck,