[Porsche-O-Phile]

Radon was a huge issue with this house (>22.0, it's very common in this part of the world). I installed a couple of active monitors (about $150 each) and resealed the basement slab & bought/installed an active mitigation system myself (under slab fan w/ direct exhaust to outside). There are a number of ways to reduce the levels but simply keeping the basement well-ventilated when possible and running the under slab fan/suction system I built when I'm not able to keeps my numbers below 0.5 typically.

Yes I believe radon is an overstated problem by the EPA but there is some validity to it as well and it's worth being concerned about to some extent. I really don't want to have any additional risk of lung cancer and additionally it'd be nice to have the issue resolved so it doesn't kebash the sale of the house when I go to sell it or tank my sale price.

In my experience the price quotes I got from "radon contractors" were ridiculous for the amount of work/effort required. I bought a couple of good books, did a bunch of research online, bought two active monitoring stations for about $150 each and ultimately bought fans, piping, wire and a few tools for under $1,000. I took me maybe 30-40 man-hours to hook everything up. IIRC the cheapest quote I got was more than $4k - forget that. The system works fine when I can't ventilate the basement (winter months) and keeps the levels below 0.5 most days.