I do a fair amount of radon testing. The average house around here has elevated levels of radon. It is not unusual to measure radon levels of 12 to 15 pCi/L. (EPA's action level is 4.0 pCi/L.) Some parts of town are typically in the mid to upper 30s. Further up in the mountains I routinely measure radon levels of 40 to 60 and as high as the upper 80s. I have heard of some measuring above 200.

__________________
"Baseball is like church. Many attend but few understand." Leo Durocher
Bruce Breedlove
www.avaloninspection.com