Iowa has some of the highest radon levels in the US. Iowa HHS says the state leads the nation in the percent of homes over 4 pCi/L and over 20 pCi/L, and its average indoor radon level is more than six times the national average ^[IA-1]. All 99 Iowa counties are in EPA Radon Zone 1 ^[EPA-5].

RadonCosts lists 89 radon mitigation companies for Iowa. Every one is on the Iowa HHS list of credentialed radon mitigation specialists (generated Sep 24, 2026) ^[IA-2], and 10 also hold NRPP certification. 12 are based in neighboring states and hold an Iowa credential.

Iowa at a glance

Iowa radon rules

• Credentialing: a person who isn’t credentialed can’t perform radon abatement in Iowa. The rule doesn’t apply to work on a building you own or to unpaid work ^{[IA-3 §136B.1]}.
• Reporting: credentialed testers and mitigators must report the building address, owner name and results to Iowa HHS within 30 days ^{[IA-3 §136B.2]}.
• Real estate: radon results fall under Iowa’s real estate disclosure rules (Iowa Code 558A.4(2)), including results from tests owners did themselves ^{[IA-3 §136B.2][IA-4]}. Tell your agent about any test you’ve done.
• Check a credential: the Iowa HHS credentialed mitigation specialist list ^[IA-2]. Each RadonCosts listing shows the HHS credential number.

Radon zones in Iowa’s largest counties

All Zone 1: Polk (Des Moines), Linn (Cedar Rapids), Scott (Davenport), Johnson (Iowa City), Black Hawk (Waterloo), Dallas, Woodbury (Sioux City), Story (Ames), Dubuque, Pottawattamie (Council Bluffs) ^[EPA-5].

County radon test results from Iowa HHS aren’t in this version yet.

Credentialed installers in Iowa

Cities with the most listed companies: Des Moines (5), Davenport, West Des Moines, Ankeny, Sioux City and Burlington (3 each).

What radon mitigation costs in Iowa

• Iowa HHS: $800–$2,500 depending on the home. The national average is about $1,200 ^[IA-1].
• National surveys: $805–$1,326, average $1,043 ^[ANGI]. Kansas City, across the line, averages about $700 (estimate) ^[ANGI].
• What Iowa installers post online: 1 of 28 IA-listed websites we could read state a mitigation-system price or price range (crawl Nov 2, 2026). These are the companies’ own advertised figures, sometimes for a specific job type (for example new construction or activating a passive system). They aren’t quotes:
  • Rigel Construction d.b.a. Mallon Construction Services: $1,500 (source)
• RadonCosts homeowner reports: not enough yet. Report what you paid.

FAQ

Do I need a credentialed mitigator in Iowa? Yes, if you’re paying someone. Owners working on their own home are exempt ^[IA-3].

Is my county high-risk? Every Iowa county is EPA Zone 1 ^[EPA-5]. Test every home.

Will my results be reported to the state? If a credentialed professional tests or mitigates, yes. They must report to Iowa HHS within 30 days ^[IA-3].

Data: Iowa HHS credentialed radon mitigation specialists (generated Sep 24, 2026), NRPP and NRSB searches (Nov 2, 2026), EPA radon zones, US Census 2024 estimates.