An effective radon mitigation system can reduce the radon level in your home by up to 99 percent. Homeowners with radon systems have also experienced a reduction of other indoor air quality issues such as moisture and soil gas intrusion problems in their home.

You should look at your warning device on a regular basis to make sure the system is working correctly. Fans may last for five years or more (manufacturer warranties tend not to exceed five years) and may then need to be repaired or replaced.

Active subslab suction — also called subslab depressurization — is the most common and usually the most reliable radon reduction method. One or more suction pipes are inserted through the floor slab into the crushed rock or soil underneath.

The average cost for a certified or licensed mitigation contractor to lower radon levels in a slab or basement home is about $1,200 and a crawl space home is about $1,400 or more.