• What is "radon"
    Radon (chemical symbol Rn and atomic number 86) is a naturally occurring radioactive gas found in
    soils, rock, and water throughout the World. It has numerous different isotopes, but radon-220, and
    222 are the most common. Radon is on of the heaviest gases, has a half-life of 3.823 days and emits
    alpha particles. Radon causes lung cancer, and is a threat to health because it tends to collect in
    homes, sometimes to very high concentrations. As a result, radon is the largest source of exposure to
    naturally occurring radiation.

  • Where does radon come from?
    Radon-222 is the decay product of radium-226. Radon-222 and its parent, radium-226, are part of the
    long decay chain for uranium-238. Since uranium is essentially ubiquitous in the earth's crust, radium-
    226 and radon-222 are present in almost all rock, soil, and water.

  • Those the age of the home matter?
    Any home can have a radon problem. This means new and old homes, well-sealed and drafty homes,
    and homes with or without basements. Nearly 1 out of 15 homes in the U.S. is estimated to have
    elevated radon levels. Elevated levels of radon gas have been found in homes across all states and

  • Does the weather affect the radon level?
    Radon levels will fluctuate daily and seasonally within a reasonable range. A short-term test is a
    snapshot and a good indicator of whether or not the home has a radon problem.

  • Can radon levels vary from house to house?
    You cannot rely on test results taken in other homes in the neighborhood to estimate the radon level
    in your home. Homes which are next to each other can have different indoor radon levels. While
    radon problems may be more common in some areas in the local community or state, any home may
    have a problem. Testing your home 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.

  • What, if the test results are high?
    High radon levels can be reduced. US EPA (US Environmental Protection Agency) recommends that
    action to reduce indoor radon levels should be taken if the radon test result is 4pCi/L or higher.
    A variety of methods can be used to reduce radon in homes. Sealing cracks and other openings
    in the foundation is a basic part of most approaches to radon reduction. EPA does not recommend
    the use of sealing alone to reduce radon because by itself, sealing has not been shown to lower
    radon levels significantly or consistently. In most cases systems called "sub-slab Pressurisation
    systems" are recommended. These systems prevent radon gas from entering the home from below
    the concrete floor and the foundation.  Depending on the design of your home and some other
    factors  a radon reduction contractor may  recommend and use other methods to reduce indoor
    radon levels. A radon mitigation system costs $800 to $1500 on the average, although this can be
    as high as $2500 in some cases.

  • Radon in Water
    Compared to radon entering the home through soil, radon entering the home through water will in most
    cases be a small source of risk. Radon gas can enter the home through well water. It can be released
    into the air you breathe when water is used for showering and other household uses. Research
    suggests that swallowing water with high radon levels may pose risks too, although risks from
    swallowing water containing radon are believed to be much lower than those from breathing air
    containing radon. Conducting radon water testing is the only way you will know if you're at risk.
    While radon in water is not a problem in homes served by most public water supplies, it has been found
    in well water. If you've tested the air in your home and found a radon problem, and your water comes
    from a well, you should perform a radon water test. Radon test kits are inexpensive and easy to use. If
    you're on a public water supply and are concerned that radon may be entering your home through the
    water, contact your municipal water department.
    Radon problems in water can be readily fixed. The most effective treatment is to remove radon from the
    water before it enters the home. This is called point-of-entry treatment. Treatment at your water tap is
    called point-of-use treatment. Unfortunately, point-of-use treatment will not reduce most of the inhalation
    risk from radon.

  • Do I need to disclose high radon levels?
    Illinois law requires disclosure of high radon levels.
       The Illinois Real Property Disclosure Act, effective October 1994, requires that a home seller
    disclose any knowledge about radon levels in the home.

  • All Radon Professionals in Illinois have to be State Licensed.

  • Please visit these websites if you would like additional information about Radon:
About Radon

American Lung

EPA  Environmental
Protection Agency)

Radon Risk &
Health Effects

IEMA / IL Emergency
Management Agency


Informative Video from EPA
about  Radon for  
Real Estate Agents & Brokers
This map is not intended to
determine if a home in a given
zone should be tested for radon.
Homes with elevated levels of
radon have been found in all
three zones.
All homes should be tested,
regardless of geographic
For additional information
contact the Illinois Emergency
Management Agency, Radon
Map recreated for web use
.Original source being USEPA
Contact us:
Radon Testing
by Illinois Licensed Radon Professionals
Status Report
for Radon in Illinois

Radon %
in your
County ?
Haga La Prueba
De Radon En Su Casa
Aviso Del Cirujano General