What to Do about Radon in Your Home

Testing Your Home for Radon

Montgomery County has areas of high geologic potential for radon. However, homes tested in areas of high geologic radon potential can have low radon readings and homes in areas of low geologic radon potential can have high readings. All homes in Montgomery County should be tested for radon. Any home can have a radon problem.

Testing is the only way to know if you and your family are at risk from radon. EPA and the Surgeon General recommend testing all homes, below the third floor, for radon. EPA also recommends testing in schools.

Read EPA's Web page on radon testing to learn more.

Be Aware! If your living patterns change and you begin occupying a lower level of your home (such as a basement), you should retest your home on that level.

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Do-It-Yourself Testing

Much of the information below is from EPA's "A Citizen's Guide to Radon."

Low-cost do-it-yourself radon test kits are available through the mail and in hardware stores and other retail outlets.

If you'd rather hire a radon professional to do the testing, you should first contact an independent radon proficiency program to get a list of the certified radon professionals serving your area.

Certified Radon Professionals

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Short-term Testing

The quickest way to test is with short-term tests. Short-term tests remain in your home for 2 to 90 days, depending on the device. Charcoal canister detectors are the most commonly used short-term testing devices. Because radon levels tend to vary from day to day and season to season, a short-term test is less likely than a long-term test to tell you your year-round average radon level. But if you need results quickly, you can use a short-term test followed by a second short-term test to decide whether to fix your home.

Testing is easy and should only take a few minutes of your time. Follow the instructions that come with your test kit.

Close your windows and outside doors and keep them closed as much as possible during the test. You can continue to operate heating and air-conditioning system fans that circulate air, but don't operate fans or other machines that bring in air from outside. You can continue to operate fans that are part of a radon-reduction system or small exhaust fans operating only for short periods. If you're doing a short-term test that lasts just 2 or 3 days, be sure to close your windows and outside doors at least 12 hours before beginning the test, too. And don't conduct short-term tests lasting just 2 or 3 days during unusually severe storms or periods of unusually high winds.

Place the test kit in the lowest lived-in level of your home (for example, the basement if it's frequently used; otherwise, the first floor). Put it in a room that is used regularly (like a living room, playroom, den, or bedroom) but not in your kitchen or bathroom.

Place the kit at least 20 inches above the floor in a location where it won't be disturbed—away from drafts, high heat, high humidity and exterior walls.

Leave the kit in place for as long as the package says. Once you've finished the test, reseal the package and send it to the lab specified on the package right away for analysis. You should receive your test results within a few weeks.

Long-term Testing

Long-term tests remain in your home for more than 90 days. "Alpha track" and "electret" detectors are commonly used for this type of testing. A long-term test will give you a reading that is more likely to tell you your home's year-round average radon level than a short-term test.

EPA recommends the following testing steps:

1. Do a short-term test. If the result is 4 pCi/L or higher, proceed to step 2 to be sure.
2. Follow up with a long-term test or a second short-term test:
   • For a better understanding of your year-round average radon level, do a long-term test.
   • If you need results quickly, conduct a second short-term test.

   The higher your initial short-term test result, the more certain you can be that you should use a short-term rather than a long-term follow-up test. If your first short-term test result is more than twice EPA's 4 pCi/L action level, you should do a second short-term test immediately.

3. If you followed up with a long-term test, fix your home if your long-term test result is 4 pCi/L or more.
   
   If you followed up with a second short-term test, the higher your short-term results, the more certain you can be that you should fix your home. Consider fixing your home if the average of your first test and second test is 4 pCi/L or higher.

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Remediating Radon in Your Home

EPA recommends that you fix your home if the radon level is 4 pCi/L or more in its assessment of health risks. Because there is no known safe level of exposure to radon, EPA also recommends that you consider fixing your home if the radon level is between 2 pCi/L and 4 pCi/L. EPA's estimate of 21,000 lung cancer deaths per year due to radon is based on the average radon concentration in American homes, which is about 1.3 pCi/L. The average concentration of radon in outdoor air is 0.4 pCi/L, or 1/10 of EPA's 4 pCi/L action level.

There are several proven methods for reducing radon in your home, but the one primarily used is a vent pipe system and fan, which pull radon from beneath the house and vent it to the outside. This system, known as a soil suction radon reduction system, does not require major changes to your home. Sealing foundation cracks and other openings makes this kind of system more effective and cost-efficient. Similar systems can also be installed in houses with crawl spaces.

How Radon Contractors Can Help

Radon contractors can use other methods that might also work in your home. The right system depends on the design of your home and other factors. See EPA's Consumer's Guide to Radon Reduction.

To locate a radon mitigation professional, contact one of the nonprofit organizations that certify radon professionals

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Radon in Real Estate Transactions

Radon is becoming an important part of the real estate transfer process in Montgomery County. For a thorough discussion of the role of radon in buying and selling homes, see EPA's Home Buyer's and Seller's Guide to Radon.

Radon and the Current Building Code

All homes constructed in Montgomery County after 1995 must have a radon-reduction system installed. For more information contact the Montgomery County Department of Permitting Services or call 311.

EPA Resource List

• Home Buyer's and Seller's Guide to Radon
  http://www.epa.gov/radon/pubs/hmbyguid.html

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