what's the highest it's ever been in pennsylvania?
This followed up with other neighbor's home having levels of 1800, 2500 and 2748 pCi/l. One home had a level that was 3,715 pCi/l. This home was the highest indoor radon level ever measured in Pennsylvania. We were able to reduce the radon levels in this home to less than 3.0 pCi/l. In 2016 a home in the development measured around 2200 pCi/l with the passive system installed by the builder and over 6000 pCi/l when the passive system was capped.