What is Radon?

Radon is a naturally occurring gas that comes from the breakdown and decay of uranium in soil, rock and water. It is odorless, colorless and tasteless and, most importantly, is found everywhere around the world. Because it is a gas, it can move easily up through the soil, rocks and water and enter homes and buildings. Any home can have a radon problem and the only way to find out if your home has a problem is to test for it as recommended by the Surgeon General. To find out more about radon, visit epa.gov/radon.

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Why is it dangerous?

Exposure to radon can have serious effects on one's health. Our modern homes and buildings are typically well insulated and relatively air tight. This can allow radon gas to build up to levels where our body's DNA repair system cannot keep all cells in our lungs healthy. Over time this can damage the lung tissue leading to lung cancer. In fact, the EPA estimates that every year over 21,000 deaths from lung cancer are due to radon exposure. This is second only to smoking as a cause of deadly lung cancer. Local variations in radon levels are often significant. It's not uncommon for two homes right next to each other to have completely different radon levels. That is why no region or neighborhood is exempt from testing. You can learn more about radon levels across Illinois using this interactive map.

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How do we test for it?

Radon testing is a straightforward and quick process. The radon monitor is placed in a lower level of the house or building under closed building conditions for a minimum of 48 hours to make sure that an adequate air sampling is collected. The monitor is then retrieved, an analysis is completed and the results are reported within a day or two. Not only is the Corentium Pro continuous radon monitor highly accurate, but it is tamper-resistant and has additional sensors for temperature, pressure and humidity. This helps to assure that the test conditions will be within IEMA regulation guidelines and valid.

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Radon is everywhere.
Let us help you manage it.

About Us

Chicago Radon Testing (CRT) is licensed by the State of Illinois Emergency Management Agency, IEMA, Division of Nuclear Safety, for radon testing. CRT is a subsidiary of Chicago Building Inspections, Inc. (CBI), a leading local inspection company with over half a century of building, renovating, moisture and forensic investigations experience. CBI's staff has inspected literally thousands of buildings and CBI is acknowledged as one of the top home and building inspections companies in Chicagoland.

CRT's licensed radon measurement professionals use only the latest and most sophisticated technology available in the marketplace, the Corentium Pro. AARST-NRPP certified, the Corentium Pro is one of the most sophisticated continuous radon monitors available. It has four silicon photodiode chambers that work in parallel for maximum reliability and performance. Developed by leading European scientists, it is specifically designed for professional radon testing and home inspections.

The lead radon measurement professional at CRT is Don Neag. He is an engineering graduate of Georgia Tech and has many years of experience in the Information Technology field. Don has completed all the required education and certification for radon measurement and analysis in Illinois. Continuous education in the radon field is a required and key part of Don's professional activities.

Services & Pricing

We offer residential and commercial testing:

  • The base fee for Radon Testing is $295 including up to 2 additional monitors.
  • Properties requiring more than 3 monitors may be subject to an additional monitor fee of $75 each.
  • For commercial building tests, including daycare facilities, please call for an estimate.


Our test came back with elevated radon, now what?

If your radon reading exceeded the 4.0 pCi/L level, mitigation is recommended to reduce the radon to 2.0 pCi/L or less. In fact the EPA recommends fixing/reducing any radon reading between 2.0 and 4.0 pCi/LA A licensed radon mitigation contractor should be contacted to analyze the site and recommend a solution.

The building is brand new, do I need to test?

Short answer, yes. IL has required passive radon piping in new single family and duplex dwellings since 2013. This eases the installation needs and costs of a mitigation system should elevated radon be detected during a test.

Our neighbor tested low, so I should be fine, right?

Wrong. It is not uncommon for adjacent properties to have entirely different radon readings. The radon source, soil composition and building performance can all significantly affect radon levels in next door buildings. We know of a recent test with a 1.2 pCi/L reading result and a house with a radon reading of 14 pCi/L a half block away.

What if the Seller/Owner won't allow radon testing?

While a radon test is not currently required by Illinois law, a radon test is a very wise investment for all parties. It will give all parties an honest picture of what the radon environment is for the property. The only way to determine what the radon presence is for a specific location is to test. Remember, radon is everywhere.

What if the device/test is tampered with?

Tampering with a radon or radon progeny measurement is prohibited by law and may result in civil penalties, the nullification of the measurement and warrant a retest at the seller’s expense.

I'm buying a high rise condo, is testing necessary?

Radon usually builds up in the lowest levels of a building. However, there are some buildings that have a higher radon level in the top floors. This can be due to artificial ventilation, natural updraft, or building materials used.

Measuring all floors can help us make healthier decisions. In most cases, it is better for our health to spend more of our time on floors with lower radon levels.

I've heard that building materials can be problems. Is this true?

Natural stone in countertops and fireplaces can contain radon and contribute to the overall presence of radon in the air although the EPA believes most types of granite are probably not major contributors of radiation and radon in the home.

How long does testing take?

A typical short-term test takes a minimum of 48 hours and can last up to 96 hours. Long-term tests can last up to 1 year in duration. Real estate radon tests are almost always 48 hours in duration.

Does CRT install radon mitigation systems?

CRT as a radon measurement firm is prohibited by state law to install mitigation systems. The same firm cannot both test for radon and install radon mitigation systems in the same site due to a conflict of interest. We can refer mitigation companies with solid work histories.

Radon in water? Seriously?

Radon gas is soluble in water so it can be present in well and municipal water supplies. However, 85–90% of radon found in the home is typically from radon soil gas movement through soil and rock into the building.

Bad weather really screwed up our test, now what?

Weather is out of everyone's control and a re-test may be necessary to gain accurate results. Discuss further with your testing professional.

Our unit is on the 2nd/3rd floor, do we need to test?

Testing is generally recommended for units below grade, at grade and up to the 3rd floor. But as mentioned earlier, elevated radon readings have been found in high-rise buildings. Testing for radon is never a bad idea.


Book standalone Radon Test
Book an Appointment

You will be taken to the CBI website.

Add Radon to existing Appointment

Contact us to arrange,
312.INSPECT or

General inquiries

Don Neag