Radon Collinsville Homeowners Should Know: Testing and Mitigation in Metro East Illinois

If you live in Collinsville or anywhere across Metro East Illinois, you have probably heard about radon gas. Maybe a neighbor mentioned it during a home inspection, or you saw a test kit at the local hardware store. The truth is radon is a serious health risk, and it is more common in this part of the state than many people realize. I have spent years working with homes in Belleville, Edwardsville, O'Fallon IL, and Collinsville, and I can tell you that the geology here creates conditions where radon can accumulate indoors. Understanding what radon is, how it gets into your home, and what you can do about it is the first step toward protecting your family.

What Is Radon Gas and Why Should You Care?

Radon is a radioactive gas that comes from the natural decay of uranium in soil and rock. It is colorless, odorless, and tasteless, so you cannot detect it without proper equipment. When radon seeps into a home through cracks in the foundation, gaps around pipes, or other openings, it can build up to dangerous levels. The EPA has classified radon as the second leading cause of lung cancer after smoking. In fact, the EPA estimates that radon causes about 21,000 lung cancer deaths each year in the United States. For nonsmokers, it is the number one cause of lung cancer.

The Illinois Emergency Management Agency oversees radon programs in the state, and they have identified many counties in Metro East Illinois as having high potential for elevated indoor radon levels. That includes the area around Collinsville. So when people search for radon Collinsville information, they are not being paranoid. They are being smart.

Why Metro East Illinois Homes Are at Higher Risk

The soil in much of the Metro East region contains significant amounts of uranium-bearing minerals. As those minerals break down over time, radon gas is released into the pore spaces in the soil. The gas then moves upward through the ground, following paths of least resistance. When a house sits above that soil, the slight pressure difference between the indoor air and the soil beneath the slab can pull radon inside. This is called the stack effect, and it is strongest during colder months when your home is heated and the indoor air rises, creating a vacuum at the lowest level.

Homes in Belleville, Edwardsville, O'Fallon IL, and Collinsville often have basements or crawlspaces that are directly in contact with the soil. That is the main entry point for radon. Even brand-new homes can have elevated radon levels if the builder did not install a radon-resistant construction system. And older homes with cracked foundations or unsealed sump pumps are especially vulnerable.

I once tested a house in Collinsville that had a finished basement used as a home office. The homeowner had lived there for eight years and never tested for radon. When I placed a charcoal canister in the basement for the required 48 hours, the result was over 8 picocuries per liter. The EPA action level is 4 picocuries per liter. That family had been breathing elevated radon for nearly a decade without knowing it. That is why radon Collinsville testing is so important.

Radon Testing: The First Step

You cannot guess your radon level. You have to measure it. There are two main types of radon detectors available to homeowners. The first is a short-term test, often using a charcoal canister. You place it in the lowest lived-in level of your home, leave it for two to seven days, and then send it to a lab for analysis. These are inexpensive and give you a quick snapshot. But radon levels can fluctuate day to day and season to season, so a single short-term test might not tell the whole story.

The second option is a continuous radon monitor. This is an electronic device that plugs into a wall and takes readings over time, often hourly. It gives you a running average and can show you whether levels spike during certain weather conditions or times of day. Continuous monitors are more expensive, but they provide a more complete picture. I recommend them for anyone who wants to make informed decisions about mitigation.

If you hire a professional radon testing company like Air Sense Environmental, we can place a continuous radon monitor in your home and interpret the results for you. We also follow strict protocols to ensure the test is valid. For example, the home must be kept in closed-house conditions for 12 hours before and during the test. That means keeping windows closed, doors shut, and avoiding exhaust fans that pull air from the basement. If those conditions are not met, the test results can be misleading.

Remember, testing is not a one-time thing. If you complete a mitigation system, you should test again to confirm the system is working. And even if your home tests low today, changes in the soil or your home's foundation could change that over time. The EPA recommends testing every two years.

When Radon Levels Are High: Mitigation Options

If your test shows radon levels above the EPA action level, do not panic. Radon mitigation is a well-established field, and there are effective ways to reduce your indoor radon concentration. The most common and reliable method for homes in Metro East Illinois is sub-slab depressurization, also called soil suction.

Here is how it works. A contractor drills a hole through the concrete slab in your basement or crawlspace, creating an opening into the soil beneath. A pipe is inserted into that hole and sealed around the edges. The pipe runs up through the house and out through the roof, and a radon fan is installed in the pipe, usually in the attic or outside. The fan creates a vacuum under the slab, pulling radon gas from the soil before it can enter your home. The gas is then vented safely above the roofline, where it disperses into the outdoor air.

A properly installed sub-slab depressurization system can reduce radon levels by 80 to 99 percent. The system also includes a manometer, which is a simple U-shaped tube filled with liquid. The manometer shows whether the fan is running and whether the vacuum is being maintained. If the manometer indicates a loss of pressure, you know something is wrong, and you can call for service.

Other mitigation methods include sealing cracks and openings in the foundation, increasing ventilation in the basement, or installing a heat recovery ventilator. But for most homes, sub-slab depressurization is the gold standard. It is effective, relatively quiet, and requires little maintenance beyond checking the manometer occasionally.

I have installed these systems in homes across Belleville, Edwardsville, O'Fallon IL, and Collinsville. The process usually takes one to two days, and the cost varies depending on the complexity of the home's layout. But when you consider the health risk of lung cancer from long-term radon exposure, it is a small price to pay for peace of mind.

What About Radon in Water?

Most radon exposure comes from breathing the gas, but if you have a private well, radon can also enter your home through the water. When you shower, run a dishwasher, or do laundry, radon is released from the water into the air. The Illinois Emergency Management Agency has guidance on testing well water for radon. If levels are high, a granular activated carbon filter or aeration system can remove it. Municipal water supplies are usually treated to remove radon, so this is mainly a concern for homes on private wells.

Choosing a Radon Professional

If you need testing or mitigation in Collinsville or anywhere in Metro East Illinois, look for a certified radon professional. The Illinois Emergency Management Agency licenses radon measurement and mitigation contractors. Always ask to see their license and insurance. A reputable company will also provide a written contract and a warranty on their work.

Air Sense Environmental has been serving the Metro East area for years, and we have seen it all. From tight crawlspaces in Edwardsville to finished basements in O'Fallon IL, we tailor each mitigation system to the specific home. We also stand by our work. After we install a system, we test the home again to confirm the radon level is below the action level. If it is not, we make adjustments until it is.

Radon Collinsville homeowners trust us because we take the time to explain what we are doing and why. We do not just throw a fan in a pipe and leave. We educate our clients so they understand how their system works and how to maintain it.

Final Thoughts

Radon is a serious issue, but it is manageable. The worst thing you can do is ignore it. If you have never tested your home for radon, now is the time. If your test shows high levels, mitigation is a proven solution. And if you live in Collinsville or any of the surrounding communities in Metro East Illinois, you are in an area where radon risk is real.

I have seen too many families discover high radon only after years of exposure. Do not let that be you. Test your home. If needed, mitigate. And then test again to make sure the system is working. It is that simple.

For more information on radon Collinsville testing and mitigation, contact a licensed professional in your area. Your health and your family's health are worth it.