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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

Predicted
99 of 99counties in Zone 1, EPA's highest radon zone
Measured
By countyCDC publishes Iowa's test figures by county: 99 of 99 counties have one.
Your home
Test to knowNo area figure here is a reading of your home.

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 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 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, Counties

Iowa counties by EPA zone

Predicted

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.

Iowa radon map by county: EPA radon zones. Map of Iowa's 99 counties shaded by EPA radon zone: Zone 1 in red-orange. 99 in Zone 1, 0 in Zone 2, 0 in Zone 3.
Iowa radon map by countyEPA radon zones for Iowa's counties: 99 counties in Zone 1, 0 counties in Zone 2, 0 counties in Zone 3.Predicted potential for each county, not a reading of any home. Homes with elevated levels of radon have been found in all three zones.

Zone 1: highest predicted potential99

Local help

Iowa, Local resources

Local resources in Iowa

Who to ask in Iowa: its radon program, test kits and professionals.

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).

Radon Action Brief

National Radon Action MonthPre-sale

The radon brief for your Iowa county, in one dated file.

  • Your area's radon record, explained.
  • Your plan to test this week.
  • Fix costs and pros near you.

Save 64%Sale price: $8.99Price after the sale: $25Ends Jan 31Then $25

Get your Iowa county's BriefSee a free sample

Area data, not a test of the building.

What it means

Iowa, Questions

Questions about radon in Iowa

Common questions

9 questions, answered from the figures above

Is radon a problem in Iowa?

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.

Iowa on the radon mapRadon levels by state

Who does radon mitigation in Iowa?

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

How do I get a radon test 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

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. 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

Which Iowa counties have the highest radon?

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.

What share of radon tests in Iowa are high?

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.

Which EPA region is Iowa in?

Iowa is in EPA Region 7: Midwest.

Do I need to test my home in Iowa?

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.

Why does this page show coverage rather than one radon level for Iowa?

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.

If you own, buy, sell or rent

What these figures mean for each reader, with the guide that covers it

Iowa in figures

The figures above, said in words

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.

    • Predicted

      Predicted

      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.

    • Compared

      Calculated by Radon411

      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.

  • Reported tests

    Measured

    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).

  • Local record

    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

Testing and mitigation products

Whatever the figures for Iowa show, only a test tells you about one home.

Test kits and monitors42

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Best radon monitors for Iowa homes, compared

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.