Radon gas in Ohio

 
 

Central Ohio has relatively high natural concentrations of uranium from glacial deposits and shale, which during radioactive decay, produces radium and radon.

The EPA’s current radon action level is four picocuries of radon per liter of air (4 pCi/L). Most counties in central Ohio have high potential for radon, with predicted average indoor greater than the EPA action level. According to one study cited by Ohio Department of Natural Resources Department of Geological Survey, 38% of Ohio’s 88 counties had average indoor radon levels above 4.0 pCi/L, but Licking County’s average was above 8.0 pCi/L. Seven Ohio counties—Carroll, Fairfield, Franklin, Harrison, Knox, Pickaway, and Ross—had average indoor Radon concentrations between 6 and 8 pCi/L.

The amount of radon in the soil depends on soil chemistry, which varies from one house to the next. Radon levels in the soil range from a few hundred to several thousands of pCi/L in air. The amount of radon that escapes from the soil to enter the house depends on the weather, soil porosity, soil moisture, and the suction within the house.

Many Ohio counties have elevated average indoor radon levels

Ohio radon potential zones map, showing central Ohio with high radon gas levels.

Average indoor radon concentrations by ZIP Code

Indoor radon levels in Grove City and surrounding ZIP codes average higher than the EPA recommended action level.

ZIP CodeCity>Number of TestsAverage
43123Grove City6477.73 pCi/L
43137Lockbourne207.45 pCi/L
43204Columbus2995.95 pCi/L
43207Columbus21012.05 pCi/L
43223Columbus1035.92 pCi/L
43119Galloway2127.68 pCi/L

Average radon readings by Ohio county

Usually, the air pressure in homes and buildings is lower than the pressure outside in the soil around or underneath the foundation–that pressure difference will create suction. As warm air rises and escapes through vents, windows, gaps, and cracks, the air in the building must be replaced. A house can get between five and 20% of its air from the basement; causing soil gas, including radon, to enter the home through the gravel and loose fill around the house’s lowest level.

Mother and daughter doing homework at teh computer in an Ohio home with radon gas.

The EPA recommends that homeowners consider fixing their homes when the radon level is between 2 and 4 pCi/L; since there is significant risk even at levels below 4 pCi/L, and there is no known safe level of radon exposure.

EPA interactive radon zone map

The EPA recommends that every home be tested for radon. Changes to your home such as additions, remodeling, or even a new roof or siding can change the level of radon inside your home. Click the button below to schedule a radon test at your home.

Radon Done radon test in progress door hanger. Homes undergoing radon testing must have all windows and doors closed for the duration of the test

Radon Done radon test in progress door hanger. Homes undergoing radon testing must have all windows and doors closed for the duration of the test

 
 

Any home can have high radon, the only way to know is to test.

Include a radon test with your home inspection for any house you consider buying.

Schedule a Radon Test Now for $150 What is Radon Gas?
 
 
 

Radon Information

Skyline of Columbus, Ohio at night. Columbus is the capital of Ohio, located in central Franklin County.

What are radon levels in Franklin county, Ohio?

Central Ohio has high radon potential according to the EPA. Average radon levels recorded and submitted to the Ohio Department of Health range from 2 to 4 Pci/L (picoCuries per liter), shown in light blue in the graphic below, to ZIP Codes with averages over 10 Pci/L, shown in red in below.

Although there is no safe level of radon exposure, the EPA Action Level for indoor radon is 4.0 Pci/L. The first step to understanding the radon level inside your own home is to test–this is something you can include with your home inspections when buying a home, or anytime for your current home. Even if you already have a radon mitigation system, the EPA recommends that you test your home every two years–many changes to your home can change the amount of radon trapped inside the living area, including new windows, siding, or roof.

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Uranium emitting alpha particles in a cloud chamber

What is radon gas?


Radon is an odorless, colorless, tasteless, radioactive gas. Radon comes from the decay of radioactive uranium that can be found in small amounts in rocks and soil throughout nature. In areas with disturbed earth, and loose fill, like when a home is built, radon escapes from the soil.

Radon gas exposure is the number one cause of cancer for non-smokers, even greater than second-hand smoke. Most people are exposed to radon gas inside their own homes, and this is their greatest exposure to natural ionizing radiation.

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All radon inspectors who enter your home wear face coverings and use hand sanitizer.

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Radon Done radon test in progress door hanger. Homes undergoing radon testing must have all windows and doors closed for the duration of the test

Radon gas in Ohio

Central Ohio has relatively high natural concentrations of uranium from glacial deposits and shale, which during radioactive decay, produces radium and radon.

The EPA’s current radon action level is four picocuries of radon per liter of air (4 pCi/L). Most counties in central Ohio have high potential for radon, with predicted average indoor greater than the EPA action level. According to one study cited by Ohio Department of Natural Resources Department of Geological Survey, 38% of Ohio’s 88 counties had average indoor radon levels above 4.0 pCi/L, but Licking County’s average was above 8.0 pCi/L. Seven Ohio counties—Carroll, Fairfield, Franklin, Harrison, Knox, Pickaway, and Ross—had average indoor Radon concentrations between 6 and 8 pCi/L.

Learn More