The radon test on the house came back too high, so we're asking the sellers to do some radon mitigation or drop the price to cover the cost of us doing it. The good news is it's pretty cheap (under $2k) and the EPA says that the method that the contractor recommended almost always gets an 80-99% reduction in levels. The house is at 10 pCi/L and 4 pCi/L is the action level, so that should get it down no problem.
(Aside: Apparently radon mitigation normally runs $800-1200, but there's a big spot in the basement that is dirt, not concrete, so first they have to pour a concrete slab. Kudos to our realtor for getting an estimate on the price to fix it - I was going to ask for less.)
The radon stuff is interesting - apparently you can't just ventilate the house and deal with the problem - you get a chimney effect where the house sucks more radon out of the ground if you do. Instead, they do sub-slab depressurization, where they put some pipes under the basement slab and run a pipe up the above the roof, where there's a fan providing a little bit of suction. Radon goes up the pipe, instead of through cracks and into the house.
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