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How to Reduce Radon Gas in Your Home

Radon Gas Mitigation Methods

Radon levels can usually be lowered using a process called mitigation, a term that means to moderate something or make it less severe. Some radon mitigation methods prevent radon from entering your home and others reduce radon levels after the gas is there.

The EPA recommends you use mitigation techniques to reduce indoor radon if levels in your home are above 4 pCi/L (or 0.02 working levels [WL] if your lab uses that reporting method).

Common Radon Mitigation Methods

Soil Suction
A mitigation system draws radon from beneath the house and vents it away from the house through pipes.

Sealing Cracks & Openings
Sealing alone doesn't usually lower radon levels, but it can limit the flow of radon into a home and reduce the loss of air that's been heated or cooled.

House Pressurization
This method uses a fan to create pressure differences that help keep radon from entering the house.

Heat Recovery Ventilator (HRV)
Installed to increase ventilation, HRV uses the heated or cooled air being exhausted to warm or cool the incoming air. This type of system is most effective when used to ventilate only the basement of a house. Heating and cooling costs will likely rise when an HRV system is in place.

Eliminating Radon in Water
Use this type of systm if you've determined that your private water supply is your home's source of radon.

  • Point-of-entry treatments use charcoal filters or aeration devices to remove radon from water before it enters your home.

  • Point-of-use devices remove radon at the tap, but they do nothing to reduce radon in unfiltered taps, such as your tubs, showers, and laundry areas, so radon in the air may remain high.

Radon Mitigation for Existing Homes
Your radon mitigation contractor can offer complete details about different types of radon reduction systems and will be in a better position to recommend the "best" system for your house after determining how radon is entering your home. Costs vary, but most systems can be installed for $1,000-$3,000.

Radon Mitigation for New Homes
If you're building a new home, now is the time to install a radon reduction system. The cost is far less than fitting a system after the home is built, and having the system in place will help the home's resale value.

The EPA offers important advice to help you find a qualified radon service professional.

If you are buying a home, be sure to include a radon contingency to your offer to purchase, stating the maximum level of radon that is acceptable to you. If tested levels are above that figure, you should have the right to back out of the contract with no penalties. Many standard forms contain a radon contingency addendum that can be added to your offer to purchase.

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