Mitigation is the act of repairing or altering a building or building design for the purpose of reducing the concentration of radon in the indoor atmosphere. A professional licensed by the Illinois Emergency Management Agency’s Radon Program can mitigate your radon levels. The average cost of a mitigation system is between $800 to $1200.
The most common type of mitigation systems is Active Soil Depressurization. These systems reduce radon by collecting radon prior to entry into the building and discharging it to a safe location.
What to look for in your mitigation system
- Effective radon reduction
- Unobtrusive and permanent installation
- Quiet operation
- Energy efficient operation and maintenance
- A system function indicator
- A primary suction point independent of the sump pit
- Sump covers with observation ports
- Exhaust above the highest eave and as close to the roof ridge line as possible
- All parts of the mitigation system are labeled and have a warning system such as the manometer below to let you know the system is working:
This mitigation system is correctly installed. Notice that the system discharges above the highest eave and as close to the roof ridgeline as possible:
Crawl spaces must be part of the mitigation plan because they can be sources of radon. A crawl space mitigation system is called Sub-Membrane Depressurization (SMD).
Once your mitigation system is installed, be sure to test for radon to ensure the system reduced your radon levels below the USEPA Action Level of 4 pCi/L.
