The acceptable level of radon in New Hampshiredepends on wether it is in water or air.The current recommendation in New Hampshire is to considerreducing radon in water when the level is between 2,000 -10,000 pCi/L and the airborne radon level in the home is 4pCi/L or more.The average level of indoor radon in the U.S. is 1.25 picocuriesper liter (pCi/L, but in New Hampshire, it is estimated to be 1,8pCi/L
Unit owners should seek Board approval beforeinstalling any remedial system. Our buildingshave a mitigation pipe inside our wall. It is locatedin the rear attic and runs to the basementfoundation wall. No external pipe is neededexcept thru the roof.
Attached photos show an installed radon mitigation system.