You failed a radon test in the Des Moines metro
An elevated result anywhere in the Des Moines metro is unremarkable — this is a Zone 1 state with the country’s highest indoor average. What matters is the sequence you follow next, especially if a suburban inspection window is running.
The most frequent local questions are about the newer stock: whether the capped pipe in the attic of a 2010s Waukee or Ankeny house counts as a system, and whether a builder-installed passive rough-in was ever tested. It is not a system until a fan runs and a measurement confirms the result, and most passive stacks were never verified against anything.
What an elevated result actually means
Confirm the reading in the same spot under closed-building conditions, and if you are under contract, collect written quotes at the same time rather than afterward. In the newer suburbs, check for a passive stack in the attic before either side digs in — the fix may be inexpensive enough to end the negotiation immediately. Iowa disclosure practice puts a known result in front of a buyer, but nothing requires a seller to install a system, so the live question is who pays and when. Closed-house conditions from December through March produce the most conservative readings, and stack effect through a full basement in an Iowa winter is strong. The suburban selling season concentrates inspections in spring, when open windows are the most common cause of an unreliable short-term test.
Your next four steps
Four steps, in this order. Confirm the result — a second short-term test or a longer-term measurement, run under closed-building conditions. Get written quotes from independent businesses holding a current Iowa radon mitigation certification. Decide who pays, which in Iowa is a negotiation and not a legal mandate. Then verify with a post-mitigation test after the system runs. Nothing about a single elevated reading forces you out of your house or out of a contract. Ask for the post-mitigation measurement after at least twenty-four hours of runtime, in the original detector location, in writing with the Iowa mitigation certification number. On a house with an activated passive stack, that test matters more than usual — builder rough-ins vary in quality and some perform poorly once a fan is added.
If the result landed inside a deal
Iowa’s residential real-estate disclosure requirements address radon: sellers disclose what they know about radon testing and results on the state disclosure form. Iowa law does not require a seller to test or to mitigate — the response to an elevated result is negotiated like any other inspection finding. Because Iowa results run high so often, metro buyers and agents treat radon as a routine line item rather than a surprise, and written quotes circulate quickly.
Communities we route in Des Moines Metro
Failed Radon Test questions in Des Moines Metro
The seller says the house was tested three years ago and was fine. Is that good enough?
It is information, not a current measurement. Radon concentrations change when a house changes — a new furnace, a finished basement, a replaced sump, new windows, even significant landscaping can shift the number. A fresh short-term test during your inspection period costs little relative to the transaction and describes the house you are actually buying.
Does an elevated result put a sale in the Des Moines metro at risk?
The metro’s transaction volume is the highest in Iowa, and radon comes up in the residential disclosure process as a matter of routine — Iowa buyers here expect a number. Neither testing nor mitigation is compelled by that disclosure. Inspection windows in the hot suburban submarkets can be tight, which pushes deals toward written quotes and negotiated credits.
Am I legally required to mitigate in Iowa?
No. A result at or above 4 pCi/L is an EPA action recommendation, not an automatic legal obligation in a Iowa sale. What state law generally governs is disclosure — telling a buyer what you know — not whether a system gets installed. Who pays, and whether the work happens before closing, is negotiated between buyer and seller.
Related Des Moines Metro guides
- Radon mitigation in Des Moines Metro
- Radon testing in Des Moines Metro
- Mitigation cost in Des Moines Metro
- System installation in Des Moines Metro
- Iowa radon contractors: join our network
Decision guides for this stage
- Failed a test during an inspection
- Negotiating radon repairs
- Buyer credit vs seller mitigation
- All homeowner decision guides
An elevated number in the Des Moines metro is a solvable building problem with a known fix and a verifiable result. Work the four steps, keep the paperwork, and let the 3 territories here put competing quotes in front of you rather than one.
Sources
- U.S. EPA — Radon
- U.S. EPA — A Citizen’s Guide to Radon
- U.S. EPA — Consumer’s Guide to Radon Reduction
- U.S. EPA — EPA Map of Radon Zones
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