The Iowa Radon Survey has indicated that Iowa has the largest percentage (or 71.6%) of homes above the US Environmental Protection Agency action level of 4pCi/L. It is also designated by the US EPA as an entirely zone 1 state, which means that at least 50% of the homes are above US EPA's recommended action level.

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Childcare Providers

Per Iowa Administrative Code 441-109(237A) which is administered by the Iowa Department of Health and Human Services (Iowa HHS), Child Care Regulatory Program, all licensed child care centers must test for radon within 1 year of opening and retest every 2 years. Centers must mitigate if radon levels are above 4.0 pCi/L (picocuries per liter). Below is a guidance document prepared by Iowa HHS.

Health Care Providers

Real Estate

There are currently no rules at the state level requiring testing or mitigation during a real estate transaction. 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).  The seller must also acknowledge that they have provided the buyer with a copy of "Iowa Radon Home-Buyers and Sellers Fact Sheet" prepared by the Iowa Department of Health and Human Services. A copy of the fact sheet  can be downloaded from the links below. The buyer must also acknowledge the receipt of the fact sheet on the disclosure statement.

Radon Resistant New Construction (RRNC)

Currently the only statewide requirements for incorporating radon resistant new construction techniques is for public schools, see above section on K-12 Schools. Requirements for the uses of RRNC techniques for all any other structures is by local ordinance or possibly by lending institutions. See additional information below on local jurisdictions with RRNC requirements.

Some Iowa counties and municipalities have adopted into their building ordinances the requirement for the inclusion of RRNC techniques into new home construction. Typically this is by adoption of all or part of Appendix F or AF, Radon Control Methods, of the International Residential Building Code (IRC). Check with your local building regulatory authority for the specific RRNC requirements for your area.

The below link will take you to the current version of the IRC. You can navigate down the contents list on the left side to Appendix AF, click to open. Older versions of the IRC and be selected via the dropdown box in the upper right of the window.

Websites on Radon