Radon is an invisible, odorless radioactive gas that seeps into homes through cracks and openings in the foundation. It is the second leading cause of lung cancer in the United States, responsible for an estimated 21,000 deaths each year. Because you cannot see, smell, or taste radon, the only way to know if your home has a problem is through testing. However, there are several situations that should raise a red flag and prompt immediate action.
Here are five clear signs that your Iowa home needs radon mitigation.
1. Your Radon Test Results Are Above 4 pCi/L
This is the most definitive sign that your home needs mitigation. The Environmental Protection Agency (EPA) has set 4 picocuries per liter (pCi/L) as the action level for radon. If your home tests at or above this level, the EPA recommends installing a radon mitigation system.
It is worth noting that the EPA also states there is no truly safe level of radon exposure. The World Health Organization recommends action at 2.7 pCi/L, and many health experts suggest considering mitigation for any level above 2 pCi/L. If your home tests between 2 and 4 pCi/L, mitigation is still a worthwhile investment in your family's health.
What to do: If you have received a test result above 4 pCi/L, contact a licensed radon mitigation contractor to schedule an installation. If your test was a short-term kit (48 hours), consider following up with a long-term test or a second short-term test to confirm. Either way, do not delay. Prolonged exposure at elevated levels increases your health risk over time.
2. You Are Buying or Selling a Home in Iowa
In Iowa, radon testing is a standard part of nearly every real estate transaction. Buyers routinely request radon testing during the inspection period, and a result above 4 pCi/L can delay or derail a sale. If you are selling a home without a radon mitigation system and the test comes back high, you will likely need to install one before closing or negotiate a price reduction.
For buyers, a high radon result during a home inspection does not mean you should walk away from the property. Radon mitigation is effective and affordable. However, it is reasonable to request that the seller install a system or provide a credit toward installation as part of the purchase agreement.
What to do: If you are selling your home, consider proactively testing and mitigating before listing. A functioning radon system with documented low post-mitigation test results is a selling point that eliminates a common negotiation hurdle. If you are buying, make sure the mitigation system includes post-installation testing and comes with a guarantee that levels will be reduced below 4 pCi/L.
3. You Live in Iowa or Linn County
Geography is one of the strongest predictors of radon risk, and Iowa is consistently ranked as one of the highest-radon states in the country. The Iowa Department of Public Health estimates that approximately 7 out of 10 Iowa homes have radon levels above the EPA action level. Linn County, which includes Cedar Rapids, Marion, and Hiawatha, is classified as a Zone 1 county by the EPA, meaning it has the highest predicted average indoor radon levels (above 4 pCi/L).
The geology of eastern Iowa contributes to this problem. The region's glacial till soils and underlying limestone bedrock are naturally rich in uranium, which decays into radon gas. This gas migrates upward through the soil and enters homes through foundation cracks, sump pits, pipe penetrations, and other openings.
What to do: If you live anywhere in the Cedar Rapids metro area and have never tested your home for radon, do so immediately. Short-term test kits are available at local hardware stores or through the Linn County Public Health Department. For the most accurate results, hire a professional radon measurement provider who uses continuous radon monitors.
4. Your Home Was Built Before Radon-Resistant Construction Became Standard
Starting in the early 2000s, many new homes in Iowa began incorporating radon-resistant new construction (RRNC) features. These include a gas-permeable layer beneath the slab, sealed polyethylene sheeting, sealed foundation cracks, and a PVC vent pipe routed from the sub-slab area to above the roofline. While these features do not eliminate radon, they significantly reduce the effort and cost needed to mitigate if levels are high.
If your home was built before 2000, it almost certainly lacks these features. Older homes in Cedar Rapids, particularly those built in the 1950s through 1990s, typically have no radon-resistant construction at all. These homes often have visible cracks in the basement floor, unsealed sump pits, and gaps around pipe penetrations that provide easy entry points for radon gas.
What to do: Test your home regardless of its age, but be especially proactive if your home was built before radon-resistant construction practices became common in Iowa. Even newer homes with RRNC features should be tested because these features reduce but do not guarantee low radon levels.
5. Your Neighbors Have High Radon Levels
Radon levels can vary significantly from one home to another, even between homes on the same block. Soil composition, foundation type, ventilation patterns, and home construction all influence indoor radon concentrations. However, if your neighbors have tested high for radon, it is a strong indicator that the soil conditions in your area produce elevated radon levels.
In Cedar Rapids neighborhoods like College Hill, Kenwood Park, Bever Park, and the southwest side, it is common to find multiple homes on the same street with radon levels well above 4 pCi/L. If a neighbor has recently installed a radon mitigation system, take that as a cue to test your own home.
What to do: Talk to your neighbors about their radon test results. Many homeowners are happy to share this information, and it can provide useful context for your own situation. Regardless of what your neighbors report, the only way to know your home's radon level is to test it directly.
The Importance of Professional Testing
While DIY short-term test kits are readily available and can provide a useful initial reading, professional radon testing offers greater accuracy and reliability. Professional testers use continuous radon monitors that measure levels every hour over a 48-hour period, providing a detailed picture of how radon levels fluctuate in your home. These devices are calibrated regularly and placed according to EPA measurement protocols.
Professional testing is particularly important if you are making a decision about mitigation based on the results. The cost of a professional radon test in Cedar Rapids typically runs $125 to $200, a small price compared to the peace of mind that comes with accurate results.
Take Action Today
If any of these five signs apply to your situation, do not wait. Radon exposure is cumulative, and the longer your family breathes elevated levels of radon, the greater the health risk. A professional radon mitigation system can reduce levels by up to 99% in most homes, and the average installation in Cedar Rapids takes just a few hours.
Call us at (319) 528-5190 for a free estimate on radon mitigation for your Cedar Rapids area home. We are licensed and insured, and every installation includes post-mitigation testing to confirm your home is safe.