By the numbers
Radon Levels in the Omaha Metro by County
Radon levels in the Omaha metro by county show that high readings are common on both sides of the Missouri River. See the published averages, then test your own home.
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Nebraska county averages
| County | Measurements | Average pCi/L |
|---|---|---|
| Douglas | 19,027 | 4.8 |
| Sarpy | 5,649 | 5.3 |
| Dodge | 922 | 5.3 |
| Saunders | 721 | 7.3 |
| Cass | 706 | 8.0 |
| Washington | 491 | 6.6 |
Source: Nebraska DHHS county report, measurements from October 1, 2019 to September 30, 2024. The EPA action level is 4.0 pCi/L.
Test your own home
Iowa side of the river
EPA lists all Iowa counties in Zone 1 (Iowa HHS radon program). Iowa reports an average indoor level of 8.5 pCi/L, compared with 1.3 for the US (Iowa HHS fact sheet). Our Council Bluffs page covers local steps.
Why the numbers matter to you
The EPA says radon can enter any home, new or old. In the state report, Douglas County averaged 4.8 pCi/L and Cass County 8.0, both above the 4.0 action level (Nebraska DHHS county report). Start with a test, see radon testing and inspection, and compare with the home inspection levels page. Go back to the home page.
Questions people ask us
Which Omaha-area county has the highest radon average?
In the state report, Cass County shows the highest average of the metro counties listed here, at 8.0 pCi/L over 706 measurements (Nebraska DHHS).
What is the EPA zone for Iowa counties?
EPA lists every Iowa county in Zone 1, the highest potential (Iowa HHS).
What does a county average tell me?
Only that radon is common nearby. Your own house can be much higher or lower.
How current are these numbers?
The Nebraska figures cover October 1, 2019 to September 30, 2024. Newer data may change them.
Does a low county average mean I can skip a test?
No. The EPA says to test all homes below the third floor.