
MonitorAEGTEST
HOUND-1011 rechargeable radon detector with a screen
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 6 hours
Locations and reports
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
The data
Iowa, At a glance
Predicted: EPA radon zone
EPA classifies counties, not states. Of the 99 counties in Iowa with a zone, 99 are in Zone 1.
An EPA radon zone describes predicted potential across a whole county. It is not intended to determine whether any individual home should be tested, and homes with elevated levels occur in all three zones. EPA recommends testing every home regardless of zone, and testing is the only way to know the radon level in a specific building.
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
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, Counties
Iowa's radon map, then all 99 counties by the zone EPA predicts for each, highest reported share of tests at or above 4 pCi/L first. Each has its own report.

Local help
Iowa, Local resources
Who to ask in Iowa: its radon program, test kits and professionals.
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.
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.
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).
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What it means
Iowa, Questions
EPA's Map of Radon Zones places 99 of the 99 Iowa counties it classifies in Zone 1, the highest predicted potential, 0 in Zone 2 and 0 in Zone 3. An EPA radon zone describes predicted potential across a whole county. It is not intended to determine whether any individual home should be tested, and homes with elevated levels occur in all three zones. EPA recommends testing every home regardless of zone, and testing is the only way to know the radon level in a specific building.
Radon411's Iowa directory lists 186 radon businesses for testing, mitigation or both, each with the licensing list it was read from. EPA recommends having a qualified contractor fix a home with a radon problem, because lowering high radon levels takes technical knowledge and special skills, and some states require the work to be done by a licensed or certified professional.
How radon mitigation worksWhat mitigation costsRadon professionals in Iowa
EPA says you can test your home yourself or hire a qualified radon test company, and that either approach takes only a small amount of time and effort. The Iowa radon program is the place to ask about certified testers and any test kit offer it runs.
How to test a homeFree and low-cost kits by stateIowa radon program
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. Zone 1 is EPA's class for highest predicted potential, a predicted average indoor screening level greater than 4 pCi/L. A zone is a prediction for a county, not a measurement of any home.
Radon in Adair CountyRadon in Adams CountyRadon in Allamakee County
99 of Iowa's 99 counties have an EPA radon zone published here. Radon411 will not rank counties on data it does not hold, and a zone is a prediction for an area rather than a measurement of any building.
CDC has published no statewide radon testing statistics for Iowa, so we cannot give a figure. Where CDC does publish one, the percentage describes radon tests reported to CDC, not homes.
Iowa is in EPA Region 7: Midwest.
Yes, wherever you live in the state. Testing is the only way to know the radon level in a specific building. EPA recommends fixing a home when the radon level is 4 pCi/L or higher. EPA recommends considering a fix when the level is between 2 and 4 pCi/L.
A statewide figure averages counties with very different geology and very different numbers of reported tests, so it hides more than it shows. The county report is the level at which the EPA zone, the geologic potential and the reported testing statistics are actually published, which is why the county table above links to every one of them.
The zone counts on this page describe counties across Iowa. They are predictions for areas, and none of them measures your building.
What the published data says about Iowa, in words. A zone and a share of tests describe an area, never the level in any one home.
EPA places 99 of Iowa's 99 counties in Zone 1.
Zone 1 counties, A to Z, begin with Adair County, Adams County and Allamakee County; the county section below lists all 99.
100% of Iowa's counties with a zone on file are in Zone 1, a larger share than across all U.S. counties (34%). It is a share of counties, not of land, people or homes.
CDC has no statewide testing figure for Iowa on file here.
99 of the 99 counties have a published county figure; the most tests in each one's latest year were reported for Polk County (10,945 tests over 2008 to 2017, laboratory), Linn County (9,395 tests over 2008 to 2017, laboratory) and Johnson County (7,321 tests over 2008 to 2017, laboratory).
Iowa's radon program is the Iowa HHS Radon Program, run by Iowa Department of Health and Human Services; its contacts are under Local resources.
3 cities have a page setting the figures of the counties it lies in side by side: Ames, Iowa City and Waterloo.
Products
Iowa, Products
Whatever the figures for Iowa show, only a test tells you about one home.
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Best radon monitors for Iowa homes, compared
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Mitigation: 1 of 3
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Informational. Follow EPA guidance. EPA says all radon tests should be taken for a minimum of 48 hours, with windows and doors closed from 12 hours before a short-term test.