Short-term kit
Radon Short Term Test Kit short-term charcoal radon test kit, lab fee included
- Lab fee included
Method: Charcoal
In home: 2 to 7 days
Locations and reports
Iowa Radon Map and Levels by County
EPA puts all of Iowa's classified counties in Zone 1. Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Share at 4+ pCi/L
58.5%
22.8 pts above U.S.
- Iowa
- 58.5%
- U.S.
- 35.7%
95,245 tests across 99 counties, 2008 to 2017
Rank among states
4 of 47
Ten highest states
- Iowa
- 58.5%
- North Dakota
- 59.3%
By share, every state pooled the same way, 2008 to 2017
Counties in EPA Zone 1
99 of 99
Most at highest potential
- Zone 1
- 99
- Zone 2
- 0
Most counties sit in Zone 1; Zone 1 is the highest potential
Highest county
84.2%
Sioux County
- Sioux
- 84.2%
- Decatur
- 25.9%
Counties with 30+ tests, 2008 to 2017
Read a result for Iowa
Starts at EPA's action level
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 4.0 pCi/L
At or above 4 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is at or above 4 pCi/L. EPA recommends fixing a home when the radon level is 4 pCi/L or higher. 58.5% of Iowa's reported tests reached 4 pCi/L, 2008 to 2017.
The data
Iowa, At a glance
Iowa at a glance
Predicted: EPA radon zone
99 of 99 counties classified
EPA classifies counties, not states. Of the 99 counties in Iowa with a zone, 99 are in Zone 1.
- Zone 1: Highest predicted potentialgreater than 4 pCi/L99 of 99 counties · 100.0%
An EPA radon zone predicts a whole county. It is not intended to determine whether any individual home should be tested: homes with elevated levels occur in all three zones, and EPA recommends testing every home regardless of zone.
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
CDC test figures, county by county
CDC publishes Iowa's radon test figures by county: 99 of its 99 counties have one. Each one's share is in the county list.
Iowa, Compared
Iowa radon figures, compared
Calculated by Radon411- Iowa, 2008 to 2017, laboratory
- 58.5%
- of 95,245 tests at or above 4 pCi/L, pooled
- Against the U.S.
- +22.8points
- 35.7% pooled
- Rank among the states
- 4 of 47
- 1 is the highest share
- Counties with 30 or more tests
- 99
- Highest
- 84.2%
- Sioux County
- Lowest
- 25.9%
- Decatur County
Pooled across 99 counties, 58.5% of the 95,245 radon tests reported to CDC for Iowa over the 2008 to 2017 laboratory totals were at or above 4 pCi/L: close to half or more. That is 4th of 47 states with county figures for the period; South Dakota (58.5%) above it and Ohio (52.3%) below.
Its 99 counties with 30 or more tests run from 25.9% in Decatur County to 84.2% in Sioux County; in 80 of them half or more of the reported tests reached 4 pCi/L. By band, 80 counties at 50% or more, 17 counties at 30% to 50%, 2 counties at 15% to 30%.
The national pool for the same period is 35.7%, so Iowa runs 22.8 points above the country. EPA's 1993 map puts 99 of its 99 classified counties in Zone 1; the tests reported since bear that out at 58.5%.
Across its 4 overlapping ten-year totals, the share went from 59.6% (2005 to 2014) to 58.5% (2008 to 2017), within 2 points, with 2005 to 2014 the highest at 59.6%.
| County | Rank | Tests | At or above 4 pCi/L |
|---|---|---|---|
| Sioux County | 1 of 99 | 1,982 | 84.2% |
| Plymouth County | 2 of 99 | 1,405 | 82.3% |
| O'Brien County | 3 of 99 | 652 | 81.7% |
| Clay County | 4 of 99 | 744 | 79.4% |
| Shelby County | 5 of 99 | 857 | 78.4% |
| Audubon County | 6 of 99 | 189 | 78.3% |
| Lyon County | 7 of 99 | 237 | 77.6% |
| Carroll County | 8 of 99 | 594 | 77.6% |
| Cass County | 9 of 99 | 327 | 77.4% |
| Sac County | 10 of 99 | 491 | 76.6% |
| Decatur County | 99 of 99 | 85 | 25.9% |
| Ringgold County | 98 of 99 | 87 | 28.7% |
| Van Buren County | 97 of 99 | 56 | 32.1% |
| Jefferson County | 96 of 99 | 841 | 33.5% |
| Monroe County | 95 of 99 | 59 | 33.9% |
| Share | Counties | Their tests | For example |
|---|---|---|---|
| 50% or more | 80 | 64,671 | Sioux County, Plymouth County, O'Brien County |
| 30% to 50% | 17 | 30,402 | Black Hawk County, Dubuque County, Muscatine County |
| 15% to 30% | 2 | 172 | Ringgold County, Decatur County |
| 5% to 15% | 0 | 0 | None |
| Under 5% | 0 | 0 | None |
Pooled shares: Radon411's sum of CDC's county counts for one period. CDC publishes no state or national figure.
Iowa, Counties
Iowa counties by EPA zone
PredictedAll 99 counties, grouped by the zone EPA predicts and ordered by their reported share at or above 4 pCi/L, under Iowa's map. Each county has a page of its own.
The 12 highest in Iowa, 2008 to 2017
- Radon levels in Sioux CountyEPA zone 1
84.2%at or above 4 pCi/L
Median 10.7 pCi/L · 1,982 tests · 25.7 points above Iowa
- Radon levels in Plymouth CountyEPA zone 1
82.3%at or above 4 pCi/L
Median 8.6 pCi/L · 1,405 tests · 23.8 points above Iowa
- Radon levels in O'Brien CountyEPA zone 1
81.7%at or above 4 pCi/L
Median 8.9 pCi/L · 652 tests · 23.3 points above Iowa
- Radon levels in Clay CountyEPA zone 1
79.4%at or above 4 pCi/L
Median 9.6 pCi/L · 744 tests · 20.9 points above Iowa
- Radon levels in Shelby CountyEPA zone 1
78.4%at or above 4 pCi/L
Median 9.0 pCi/L · 857 tests · 19.9 points above Iowa
- Radon levels in Audubon CountyEPA zone 1
78.3%at or above 4 pCi/L
Median 9.5 pCi/L · 189 tests · 19.8 points above Iowa
- Radon levels in Lyon CountyEPA zone 1
77.6%at or above 4 pCi/L
Median 8.3 pCi/L · 237 tests · 19.2 points above Iowa
- Radon levels in Carroll CountyEPA zone 1
77.6%at or above 4 pCi/L
Median 7.8 pCi/L · 594 tests · 19.1 points above Iowa
- Radon levels in Cass CountyEPA zone 1
77.4%at or above 4 pCi/L
Median 8.1 pCi/L · 327 tests · 18.9 points above Iowa
- Radon levels in Sac CountyEPA zone 1
76.6%at or above 4 pCi/L
Median 7.0 pCi/L · 491 tests · 18.1 points above Iowa
- Radon levels in Crawford CountyEPA zone 1
74.8%at or above 4 pCi/L
Median 7.0 pCi/L · 373 tests · 16.3 points above Iowa
- Radon levels in Monona CountyEPA zone 1
74.6%at or above 4 pCi/L
Median 7.0 pCi/L · 603 tests · 16.1 points above Iowa
Zone 1: highest predicted potential99
- Sioux County84.2% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Plymouth County82.3% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- O'Brien County81.7% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Clay County79.4% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Shelby County78.4% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Audubon County78.3% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Carroll County77.6% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Lyon County77.6% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Cass County77.4% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Sac County76.6% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Crawford County74.8% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Monona County74.6% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Cherokee County74.5% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Franklin County73.5% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Jasper County73.3% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Allamakee County73.2% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Adair County72.4% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Buena Vista County72.1% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Winnebago County71.9% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Ida County71.7% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Page County71.7% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Greene County71.3% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Emmet County71.0% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Guthrie County70.8% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Palo Alto County70.8% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Mitchell County70.7% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Poweshiek County70.6% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Dickinson County70.3% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Marshall County70.2% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Humboldt County70.1% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Mills County70.1% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Calhoun County69.8% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Fremont County69.8% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Harrison County69.8% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Webster County69.4% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Woodbury County69.2% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Pocahontas County68.8% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Boone County68.7% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Tama County67.9% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Worth County67.5% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Montgomery County67.4% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Marion County67.3% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Osceola County67.2% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Grundy County66.9% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Wright County66.8% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Winneshiek County66.4% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Kossuth County66.1% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Warren County66.0% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Adams County65.4% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Hancock County64.5% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Polk County64.4% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Hamilton County64.3% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Hardin County62.8% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Fayette County62.7% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Clayton County62.6% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Madison County62.3% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Benton County62.1% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Union County61.8% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Howard County61.3% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Mahaska County61.1% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Taylor County60.9% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Cedar County60.4% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Keokuk County60.3% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Butler County59.9% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Story County59.9% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Floyd County59.5% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Jones County59.3% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Iowa County59.2% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Cerro Gordo County59.0% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Chickasaw County59.0% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Dallas County58.5% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Pottawattamie County57.4% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Washington County54.9% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Bremer County53.0% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Clinton County52.7% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Jackson County52.7% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Louisa County52.1% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Buchanan County51.2% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Des Moines County51.1% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Delaware County50.0% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Black Hawk County48.4% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Dubuque County46.8% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Muscatine County46.5% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Henry County46.4% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Clarke County45.8% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Appanoose County45.3% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Scott County44.3% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Lee County43.6% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Davis County42.4% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Johnson County41.6% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Linn County39.7% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Lucas County39.3% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Wapello County35.9% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Wayne County34.8% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Monroe County33.9% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Jefferson County33.5% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Van Buren County32.1% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Ringgold County28.7% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- Decatur County25.9% of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
Local help
Iowa, Local resources
Local resources in Iowa
Who to ask in Iowa: its radon program, test kits and professionals.
- Iowa HHS Radon ProgramIowa HHS Radon Program, run by Iowa Department of Health and Human Services, licenses or certifies radon professionals, offers free or discounted test kits and states the rule for disclosing radon when a home is sold, and answers questions about testing and mitigation in Iowa.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsThe program says:
You can reach the Hotline by calling 1-800-383-5992 to order low-cost radon test kits and find answers to your radon questions.
- Compare kits
- Professionals in Iowa185 professionals are listed in Iowa.
What Iowa's program says
- Phone
- (515) 281-4928
- Licensing of radon professionals
Iowa’s radon program approves applications for persons who wish to become certified to perform radon testing or credentialed to perform mitigation and laboratories that provide radon testing devices and analytical services.
- Disclosure when a home is sold or rented
However, per Iowa Code chapters 543B.9 and 543B.18 and Iowa Administrative Code 193E Chapter 14 administered by the Iowa Real Estate Commission, a seller must disclose any known tests for the presence of radon and if yes, provide the date of last report and the result(s).
What it means
Iowa, Questions
Questions about radon in Iowa
Is radon a problem in Iowa?
Of the 99 counties in Iowa that EPA's Map of Radon Zones classifies, 99 carry Zone 1 (the highest predicted potential), 0 Zone 2 and 0 Zone 3. Pooled from 99 counties, 58.5% of the 95,245 radon tests reported to CDC over the 2008 to 2017 laboratory totals were at or above 4 pCi/L, 4th of 47 states.
Who does radon mitigation in Iowa?
Radon411's Iowa directory lists 185 radon businesses for testing, mitigation or both, each with the licensing list it was read from.
Which Iowa counties are in EPA radon Zone 1?
99 counties are in Zone 1: Adair County, Adams County, Allamakee County, Appanoose County, Audubon County, Benton County, Black Hawk County, Boone County, and 91 more in the county table on this page.
Which Iowa counties have the highest radon?
By the share of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory: Sioux County 84.2% (1,982 tests), Plymouth County 82.3% (1,405 tests), O'Brien County 81.7% (652 tests), Clay County 79.4% (744 tests), Shelby County 78.4% (857 tests).
Which EPA region is Iowa in?
Iowa is in EPA Region 7: Midwest.
Products
Iowa, Products
Testing a home in Iowa
58.5% of the 95,245 tests reported to CDC for Iowa over the 2008 to 2017 laboratory totals reached 4 pCi/L: a short-term kit (2 to 90 days) gives a first answer in days, a long-term test the year-round average. A short-term kit (2 to 90 days) is the quick first check for a home in Iowa; a long-term test tells the year-round average.
Test kits and monitors3
See every kit and monitor
Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
MonitorINKBIRD
INK-RD3 battery radon monitor with an e-ink screen
- C-NRPP 2024/25: Not included
- Battery
- Screen
First reading: Within 24 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
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