Understanding Radon Collinsville Homeowners Should Know

If you live in Collinsville or anywhere in Metro East Illinois, you have probably heard about radon gas. But what does it actually mean for your home? I have spent years testing and mitigating radon in this region, and the short answer is that radon is a serious concern here. The geology of the area, combined with how we build and heat our homes, creates conditions where radon can accumulate to unhealthy levels. This is not a problem that you can see or smell, which makes it easy to ignore. But the health risks are real, and the good news is that radon is a problem you can fix.

Radon comes from the natural breakdown of uranium in soil and rock. As it decays, it releases a radioactive gas that moves up through the ground and into the air. Outdoors, it dilutes to harmless levels. Indoors, it can get trapped and build up. The EPA has set an action level of 4 picocuries per liter of air. Above that, they recommend taking steps to reduce it. In Metro East Illinois, especially in areas like Collinsville, Belleville, Edwardsville, and O'Fallon IL, I have seen many homes test well above that threshold. The local soil and bedrock are simply more likely to produce radon.

I remember one job in Collinsville a few years back. A family had lived in their home for over a decade. They had never tested for radon. When I finally placed a charcoal canister in their basement for a few days, the result came back at 12 picocuries per liter. That is three times the EPA action level. The homeowners were shocked. They had no idea. That is the thing about radon collinsville residents often do not realize until they test: it can be a hidden hazard even in a well-maintained home. After a proper radon mitigation system was installed, their levels dropped to below 2 picocuries per liter. That is a huge reduction in health risk for a relatively modest investment.

Why Collinsville Homes Are at Risk

The risk for radon collinsville homes face is tied to the local geology. Much of the Metro East area sits on glacial till and limestone bedrock. These materials contain trace amounts of uranium. As the uranium decays, radon is produced. The gas then travels through pores and cracks in the soil. It can enter a home through the basement floor, slab, crawl space, or even through the water supply if the home uses a private well. The way a house is built and how it is used also matters. During the heating season, warm indoor air rises and creates a slight vacuum at the lowest level. This pulls soil gas, including radon, into the house. It is a process called the stack effect, and it is very effective at bringing radon indoors.

I have tested homes in Belleville that were built on a slab with no vapor barrier. Those homes often show higher radon levels because the gas has a direct path through the concrete. In Edwardsville, I have seen homes with deep basements that act like a sump for radon. Even well-sealed homes can have elevated levels if the soil underneath is rich in radon-producing minerals. There is no way to predict radon levels based on how new or clean a home looks. The only way to know is to test.

Testing: The First Step

Testing for radon is straightforward. You can do it yourself with a short-term test kit, typically a charcoal canister that you leave in the lowest livable area of your home for two to seven days. You then send it to a lab for analysis. These tests are inexpensive and give you a snapshot of your radon levels. For a more accurate picture, a continuous radon monitor can be placed in the home for several months. This device records radon levels hour by hour and gives you an average. I usually recommend starting with a short-term test. If it comes back above 4 picocuries per liter, then consider a longer-term test or a professional assessment.

Air Sense Environmental offers radon testing services throughout Metro East Illinois, including Collinsville. We use both charcoal canisters and continuous radon monitors depending on the situation. A professional test can also identify the likely entry points for radon, which is helpful when planning mitigation. But even a DIY test is far better than no test. The Illinois Emergency Management Agency provides guidance and maintains a list of certified radon measurement professionals. They also require that all radon mitigation systems in the state be installed by a licensed radon mitigation contractor. It is important to follow those standards.

Mitigation: How It Works

If your test shows elevated radon levels, the most common and effective fix is sub-slab depressurization. This is a type of soil suction system. A contractor drills a small hole through the basement slab or concrete floor, digs out a pit underneath, and installs a pipe that runs from that pit up through the roof or out through the side wall of the house. A radon fan is attached to the pipe. The fan creates a vacuum under the slab, pulling radon-laden soil gas out of the ground and venting it safely above the roofline, where it disperses. A manometer is installed on the pipe to show that the system is working. You can check it visually at any time. If the manometer shows a pressure difference, the system is operating.

I have installed dozens of these systems in the Metro East area. The cost varies depending on the home, but it is usually between $800 and $1,500. That might sound like a lot, but consider the alternative: long-term exposure to radon is the second leading cause of lung cancer in the United States, according to the EPA. Only smoking causes more cases. For nonsmokers, radon is the number one cause of lung cancer. Reducing your radon level from 12 to 2 picocuries per liter cuts your risk dramatically. It is one of the most cost-effective health improvements you can make to your home.

Maintenance and Retesting

Once a radon mitigation system is installed, it requires very little maintenance. The radon fan should last five to ten years. The manometer needs to be checked periodically to confirm the system is running. If the manometer reads zero or near zero, the fan may have failed or the pipe may be blocked. Also, it is a good idea to retest your home every two years or after any major renovation that affects the lowest level of the house. Radon levels can change over time as the soil shifts or as the house settles. The Illinois Emergency Management Agency recommends retesting periodically. I have seen homes where a system worked perfectly for years, then a new foundation crack allowed radon to bypass the suction point. A simple retest caught it, and a minor adjustment fixed it.

What About New Homes?

If you are building a new home in Collinsville, Belleville, Edwardsville, or O'Fallon IL, you have an opportunity to install radon-resistant features during construction. This is much cheaper than retrofitting later. A passive system includes a layer of gravel under the slab, a vapor barrier, a vent pipe running from the gravel up to the roof, and sealing all openings in the foundation. After construction, you can test the home. If radon levels are still high, you can easily add a radon fan to the passive pipe to turn it into an active system. Many new homes in the Metro East area are built with these features, but not all. It is worth asking your builder or checking the plans. Air Sense Environmental can review new home plans and advise on the best approach.

One thing I often tell homeowners is that radon collinsville is not something to panic about, but it is something to take seriously. The process is simple: test, mitigate if needed, and retest. That is it. You do not need to move out of your home. You do not need to tear up your floors. The technology is proven and reliable. Sub-slab depressurization works. I have seen it reduce radon levels by 90 percent or more in dozens of homes. The key is to test first. Do not assume your home is safe because your neighbor tested low. Radon levels can vary dramatically from one house to the next, even on the same street.

Final Thoughts

Living in Collinsville and the surrounding Metro East communities is wonderful. The area has great schools, parks, and a strong sense of community. But the geology here means radon is a real concern. The good news is that it is a problem you can solve. Start with a simple test. If you need help, companies like Air Sense Environmental are here to guide you through the process. Do not wait. Radon is a health risk that builds up over years of exposure. The sooner you test and mitigate, the sooner you can breathe easier. And that is a peace of mind that no home should be without.