According to the EPA a standard level of less than 4.0 pCi/L is considered safe. Many homes in our area have levels twice that due to the amount of radon found in our soil. A radon reduction system removes much of the radon before it even gets inside your home. For more details about possible health issues related to radon please consult the EPA website. Most homebuyers now require testing for radon. If your home is above the EPA standard most lenders will require your home be fixed before the sale can close. It never hurts to be ahead on this.