"It actually helps make it less expensive, if you do have the radon, to put the fan in later," State Senator Scott Webster told Radio Iowa in May, describing the roughly $400 to $500 pipe-and-vent system now built into new Iowa homes. Webster, a homebuilder himself, was talking about new construction going up after July 1, 2026. If you're getting ready to sell a ranch that went up on 86th Street or Meredith Drive in 1978, his bill has nothing to say about your house at all.
That gap matters more than the headline. Iowa's legislature passed House File 2297 this spring, Governor Reynolds signed it on May 19, and it took effect July 1. It requires passive radon mitigation systems in new single-family and two-family construction. It's a real law with a real effective date. It's also, for the typical Urbandale seller, close to irrelevant, and understanding why tells you more about what actually protects you at closing than the new law does.
What HF2297 actually requires, and what it doesn't yet
The law tells the state building code to add a passive radon mitigation requirement, drawn from Appendix AF of the 2021 International Residential Code, to new single and two-family homes. That sounds like a hard deadline. It isn't quite one. A construction-law analysis published by Lexology after the Iowa Department of Inspections, Appeals, and Licensing weighed in on June 25 notes that HF2297 doesn't independently create an enforceable requirement. The state building code commissioner still has to formally adopt the change, and the mandate only applies to construction that starts after that adoption happens. The same analysis adds a detail worth sitting with: most Iowa homebuilders already install passive systems voluntarily, so the law is expected to change little about how new homes actually get built.
So the law that made news in May is, as of this summer, mostly a formal catch-up to what builders were already doing. That's useful to know if you're buying new construction. It's almost beside the point if you're selling something older.
Why Urbandale's housing stock sits outside this entirely
Urbandale's older neighborhoods are built out in midcentury ranch and split-level homes, the kind with a finished or half-finished lower level tucked partly below grade. None of that inventory was built to any radon standard, because no such standard existed in Polk County when those foundations were poured. The new law can't reach backward. It only governs construction that starts after the state adopts the amendment, which means every existing basement and crawl space in the city is governed by nothing more than the disclosure rules that were already on the books.
Even Urbandale's newer construction isn't automatically covered by the old patchwork of local radon rules that predated this year's law. Iowa's own health department keeps a list of the jurisdictions that required radon-resistant construction techniques before HF2297 passed, and it's short:
| Jurisdiction | Required radon-resistant new construction before July 2026 |
|---|---|
| Norwalk | Yes |
| Altoona | Yes |
| Bondurant | Yes |
| Iowa City | Yes |
| North Liberty | Yes |
| Pella | Yes |
| Carroll | Yes |
| Bremer County | Yes |
| Johnson County | Yes |
| Linn County | Yes |
| Polk County (unincorporated) | Yes |
| Urbandale | No |
Urbandale sits inside Polk County, which had already required these techniques in unincorporated areas, but the city never separately adopted that requirement into its own code. Urbandale's building department currently administers the 2018 International Residential Code, a version that predates the appendix HF2297 now points to. A house built in Urbandale in 2019 or 2022 may or may not have a passive radon system, depending entirely on whether the builder chose to include one voluntarily. There was no local requirement forcing the issue either way.
What actually governs your listing right now
None of this leaves an Urbandale seller unregulated. It just means the operative rules are the ones Iowa has had in place for years, not the ones that made news this spring. Under Iowa Code Chapter 558A and the property condition disclosure rule administered by the Iowa Real Estate Commission, a seller has to fill out a written disclosure statement and answer specific questions about the property, including any known radon test results.
Here's what that actually requires in practice:
- If you've had the home tested, you disclose the date and result on the disclosure statement.
- You're required to provide the buyer with a copy of the state's Iowa Radon Home-Buyers and Sellers Fact Sheet and get their signed acknowledgment of receipt.
- If you've never tested, there's no state mandate forcing you to before you list.
- There's no requirement to install a mitigation system regardless of what a test shows, though in practice a high reading almost always becomes a negotiating point during the inspection period.
That last part is where most Urbandale transactions actually live. A buyer's agent adds a radon contingency, a certified measurement professional sets a continuous monitor in the lowest livable level for 48 hours, and the number that comes back either closes the question or opens a conversation about who pays for a fix.
Maria Stelle, an Adel resident who testified to lawmakers in March after her own diagnosis, put the surprise plainly:
I didn't realize the prevalence of it here in Iowa was 70% of Iowa homes being high in radon.
That's close to the actual figure. Iowa's radon survey found that 71.6% of tested homes come in above the EPA's 4.0 pCi/L action level, the highest share of any state, and the EPA rates all 99 Iowa counties as Zone 1, the top risk tier. That number doesn't check the county's list of pre-2026 jurisdictions. It doesn't care whether your split-level went up in 1981 or last year. It's the actual risk sitting under most Urbandale basements right now, new law or not.
What to do about it before you list
- Test before you list rather than waiting for a buyer's inspector to hand you a surprise number during a negotiation window. A certified professional running a 48-hour continuous monitor gives you a result you control on your own timeline.
- Pull any past test reports you have. The disclosure statement asks for the date and result, not just whether you're aware of a general risk.
- If a test comes back elevated, get a mitigation quote before your first showing. A retrofit on an existing home typically costs more than the $400 to $500 builders quote for a passive system poured into new construction, but pricing it ahead of time keeps you setting the terms instead of reacting to someone else's number.
- Keep the signed Fact Sheet acknowledgment with your closing paperwork. It's part of the disclosure record a buyer's agent will expect to see.
A few direct questions
Does the new radon law apply to my existing Urbandale home? No. It only applies to new single-family and two-family construction that begins after the state formally amends the building code, and that formal adoption hadn't happened as of the law's July 1 effective date.
Am I required to test my home for radon before selling? No. Iowa's disclosure law requires you to share what you already know. It doesn't create a new obligation to go find something to disclose.
What happens if a buyer's inspection turns up a high reading? It becomes a standard negotiation over mitigation cost or a closing credit. It's common enough in Iowa transactions that it shouldn't be treated as a sign the deal is in trouble.
If you're weighing whether to test before you list, or you've already got a report in hand and aren't sure what it means for your price or your timeline, Tim Lucken REAL works through exactly this kind of pre-listing question with Urbandale sellers. Schedule your free Market-Ready Consultation and let's look at your specific house before a buyer's inspector does.
