Iowa Legislation Relating to Radon Mitigation in Residential Buildings Signed by the Governor

Iowa Legislation Relating to Radon Mitigation in Residential Buildings Signed by the Governor

Iowa House File 2297, an Act relating to radon mitigation in residential buildings, was signed by Governor Kim Reynolds on May 19, 2026.

The Act specifies that provisions of the state building code relating to radon mitigation requirements shall be applicable to all new single-family and two-family residential construction in this state.

The Radon Mitigation Requirements are as follows:

The commissioner shall adopt as part of the state building code a requirement that new single-family or two-family residential construction must include a passive method for the mitigation of radon listed in appendix AF of the international residential code, 2021 edition, published by the International Code Council. The requirement shall only apply to single-family or two-family residential construction commenced after the adoption of the requirement.

The bill passed the House with 81 yeas and 3 nays, the House having concurred in a Senate amendment.

To see the bill, visit https://www.legis.iowa.gov/legislation/BillBook?ba=HF2297&ga=91

Iowa (House File 2297): Signed into law by Gov. Kim Reynolds, this legislation mandates that all newly constructed single- and two-family residences must include passive radon mitigation systems. Aimed at lowering the state's severe lung cancer risks, it takes effect July 1 and requires enforcement by local governments.