Why a Radon Real Estate Test Matters for Metro East Home Buyers and Sellers

If you are buying or selling a home in the Metro East area of Illinois, you have likely heard about radon gas. It is a naturally occurring radioactive gas that comes from the breakdown of uranium in soil. It can seep into homes through cracks in the foundation, gaps around pipes, and other openings. Because radon is invisible and odorless, the only way to know if it is present at unsafe levels is to test for it. A radon real estate test has become a standard part of the home inspection process for many transactions in Belleville, Edwardsville, O'Fallon, and Collinsville.

Understanding Radon and Its Risks

Radon gas is the second leading cause of lung cancer in the United States, according to the EPA. The agency recommends that all homes be tested for radon, and that action be taken if levels are at or above 4 picocuries per liter (pCi/L). In the Metro East region, the geology is such that radon can be a concern. Homes built on soil with high uranium content are more likely to have elevated radon levels. That is why a radon real estate test is not just a box to check during a home sale. It is a health issue that affects the value and safety of the property.

Short-Term vs. Long-Term Radon Tests

When it comes to testing, there are two main approaches: short-term radon test and long-term radon test. A short-term test typically lasts between two and seven days. These tests use devices that contain activated carbon, which absorbs radon from the air. After the test period, the device is sent to a lab for analysis. Short-term tests are common during real estate transactions because they provide results quickly. However, they only capture a snapshot of radon levels, which can fluctuate with weather, season, and how the home is ventilated.

A long-term radon test, on the other hand, lasts more than 90 days. These tests often use alpha track detectors, which measure radon over an extended period. Long-term tests give a more accurate picture of the average radon level in the home. For homeowners who are not in a hurry, a long-term test is the better choice. But in a real estate transaction, time is usually limited, so a short-term radon test is more practical. Some testers also use continuous radon monitors, which provide real-time readings and can detect short-term spikes.

How a Radon Real Estate Test Fits Into the Home Inspection

During a home inspection, the inspector may suggest a radon real estate test as an add-on service. The test is typically conducted in the lowest livable level of the home, such as a basement or a room built on a concrete slab. The tester places the device in a location where it will not be disturbed and where air circulation is normal. Doors and windows are kept closed as much as possible during the test, except for normal entry and exit. The goal is to simulate the conditions under which the home is lived in.

If the test results come back at 4 pCi/L or higher, the EPA recommends installing a radon mitigation system. The most common type is sub-slab depressurization, also called active soil depressurization. This system involves drilling a hole through the basement floor, inserting a pipe, and connecting it to a radon fan that draws radon gas from beneath the slab and vents it safely above the roof. A manometer is installed on the pipe to show that the fan is working properly. Companies like Air Sense Environmental, which serves Belleville, Edwardsville, O'Fallon, and Collinsville, specialize in these installations. They use equipment from manufacturers like RadonAway to ensure the system is reliable and effective.

What Buyers and Sellers Need to Know

For buyers, a radon test is a way to negotiate repairs or a price reduction if elevated levels are found. For sellers, having a recent test result that shows low levels can be a selling point. It shows that the home has been properly maintained and that the indoor air quality is safe. In some cases, sellers choose to install a mitigation system before listing the home, which can speed up the transaction and reduce the chance of surprises during the inspection.

It is important to note that radon levels can change over time. Even if a home tested low five years ago, it could test high today. That is why a radon real estate test should be performed for each transaction. The results are specific to the conditions at the time of the test. If the home has undergone renovations, such as adding a new foundation or sealing cracks, the radon entry points may have changed.

The Role of the Tester

Not all radon tests are created equal. The quality of the test depends on the device used, the placement, and the conditions during the test. A certified radon tester follows strict protocols to ensure accurate results. For example, the tester must record the start and end times, the location of the device, and any unusual conditions like severe weather or construction that could affect the test. The device itself must be within its expiration date and calibrated properly. Short-term tests using activated carbon are reliable if handled correctly, but they can be influenced by high humidity or improper sealing.

Some homeowners attempt to do their own radon test using a kit from a hardware store. While these kits can give a general idea, they are not always suitable for a real estate transaction. The stakes are higher, and the test must be defensible. A professional tester, such as those from Air Sense Environmental, can provide a radon real estate test that meets industry standards and can be used in negotiations.

Mitigation: What Happens If Levels Are High

If the test results show elevated radon, the next step is mitigation. The goal of a radon mitigation system is to reduce the radon level to below 4 pCi/L, and ideally as low as possible. The most effective method is sub-slab depressurization, which works by creating a vacuum beneath the foundation. The radon fan runs continuously, and the manometer provides a visual check that the system is operating. In homes without a basement, a crawl space or a sealed sump pump may be used instead.

Other mitigation techniques include sealing cracks and openings in the foundation, improving ventilation, and using a heat recovery ventilator to dilute radon levels. However, sealing alone is rarely sufficient because radon can still enter through tiny gaps and pores in the concrete. A combination of sealing and active soil depressurization is the standard approach recommended by the EPA.

After the system is installed, a follow-up test is performed to confirm that radon levels have dropped. This post-mitigation test is usually a short-term radon test, and it should be conducted under the same conditions as the initial test. The manometer should be checked regularly to ensure the fan is still running, especially during winter when windows are closed and the home is sealed tight.

Radon in the Metro East Area

Belleville, Edwardsville, O'Fallon, and Collinsville are communities where radon testing is particularly relevant. The soil in this part of Illinois contains varying amounts of uranium, and homes built before 1990 are more likely to have elevated levels. However, even newer homes can have radon problems if the soil allows gas to seep in. The EPA has mapped radon potential zones, and much of the Metro East area falls into Zone 1, which means predicted average indoor radon levels are above 4 pCi/L.

That is why a radon real estate test is not something to skip. It is a relatively small investment compared to the cost of a home, and it provides peace of mind. If you are selling a home in Edwardsville, for example, having a recent test result can make your listing more attractive. If you are buying a home in O'Fallon, you can request a test as part of your inspection contingency.

Final Thoughts on Testing and Timing

The best time to test for radon is during the cooler months, when homes are closed up and radon levels tend to be higher. But a radon real estate test can be done at any time of year, as long as the home is kept in closed-house conditions for at least 12 hours before the test begins. The tester will advise on the specific requirements for the test device being used.

Continuous radon monitors are becoming more popular because they provide hourly readings and reduce the chance of tampering. They are often used in real estate transactions where the buyer wants a higher level of assurance. However, they are more expensive than single-use test kits. For most transactions, a short-term test with an alpha track detector or activated carbon device is sufficient, especially if the tester is experienced and follows the EPA protocols.

Ultimately, a radon real estate test is a tool that empowers buyers and sellers with information. It removes the uncertainty about a hidden danger and allows both parties to make informed decisions. Whether you are working with Air Sense Environmental or another certified tester, the key is to test, mitigate if needed, and move forward with confidence.