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Senate requires passive radon mitigation in new single- and two-family homes

Iowa Senate · April 29, 2026
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Summary

House File 2297, amended to require local governments to adopt a state code requiring passive radon-mitigation systems for new single-family and two-family residential construction, passed the Senate unanimously; sponsor cited radon as a cause of lung cancer and estimated typical mitigation costs.

Senator Webster floor-managed House File 2297 to require adoption in local building codes of a passive radon-mitigation method for new single-family and two-family residential construction. He said the requirement aims to ensure uniform adoption across local governments so that radon-mitigation systems become standard in new builds.

"This would require local governments to adopt this code so that radon mitigation will be required in local government, single family and 2 family homes," Senator Webster said. He described radon as "a cause of lung cancer" and said the passive system is a relatively simple installation that many builders already include; he estimated a cost of about $400 to $500 in eastern Iowa.

The Senate adopted the amendment offered by floor managers and placed the bill on final passage. The secretary recorded a roll-call vote of 46 ayes and 0 nays; the bill was declared passed and ordered messaged to the governor.