What is Radon?
Radon is a colorless, odorless, and carcinogenic gas that seeps into buildings through small cracks and openings in the foundation. The only way to determine indoor radon levels is through testing.
US Environmental Testing LLC is licensed to perform all types of radon detection testing, including:
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DCFS testing
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Follow-up radon testing
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Real estate transaction testing
Our certified radon professionals serve commercial buildings, day care centers, multi-family dwellings, and residential homes.
If we detect radon levels above the EPA action level of 4.0 picocuries per liter (pCi/L), we provide expert recommendations for effective remediation solutions.
What is radon? How does it enter a building?
Certified Radon Testing Services
Radon is a naturally occurring gas that rises from the soil. It is colorless, odorless, and carcinogenic. Radon enters buildings through small cracks and openings in the foundation. The only way to detect indoor radon levels is through professional testing.
When inhaled, radon gas decays into radioactive particles known as radon decay products (RDPs). These particles release alpha and beta radiation, which can damage lung tissue over time.
Long-term exposure to radon significantly increases the risk of lung cancer. According to the U.S. Environmental Protection Agency (EPA), radon exposure contributes to an estimated 21,000 lung cancer deaths each year.
US Environmental Testing is licensed to provide certified radon testing for all types of buildings, including:
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DCFS testing for private and commercial daycare centers
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Follow-up and post-mitigation radon testing
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HUD-compliant testing
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Real estate transaction testing
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Compliance testing for federal, state, and local regulations
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University and educational facility testing
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Multi-family housing assessments
Types of radon detection:
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Diagnostic measurements: an initial test performed to identify radon levels in a dwelling.
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Follow-up measurements: a second test performed to confirm levels previously detected; usually performed to verify the results of a home-test kit or to verify another company's test result.
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Short- and Long- term measurement: Short- term measurements last forty-eight hours to 90-days, while long term measurements tend to last 91 days to one year in duration.
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Pre- and post- mitigation measurements: a pre-mitigation test may be any test performed prior to mitigation solutions are performed. While post-mitigation testing includes a second test to determine efficacy of the radon mitigation system. The post-mitigation test shall be performed 24 hours to 30-days after the installation and activation of the mitigation system.
Are you in need of a radon measurement?
Need a Radon Measurement? We’ve Got You Covered.
US Environmental Testing specializes in professional radon measurements for single-family homes, duplexes, and condominiums. Whether you're a homeowner or involved in a real estate transaction, we deliver accurate, reliable testing to ensure your property is safe.
Looking for radon mitigation? We partner with trusted, licensed mitigation companies to ensure effective solutions if elevated levels are found.
Buying or Selling a Home?
We provide pre-closing radon testing tailored for real estate transactions—fast, compliant, and hassle-free.
Has it been over two years since your last test?
Contact Northern Illinois Radon, our dedicated radon division, to learn how regular testing protects your home and family from the long-term health risks of radon exposure.
Breathe With Confidence.
With our certified radon services, you’ll know your air is safe. We offer:
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Diagnostic Testing
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Follow-Up Testing
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New Construction & Remodeling Measurements
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Pre- and Post-Mitigation Measurements
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Short-Term & Long-Term Testing Options
How to prepare for a closed building radon measurement:
Preparing for a Closed-Building Radon Measurement
Steps to Follow Before and During Testing by US Environmental Testing
To ensure accurate radon measurement results, follow the steps below before and during the testing period. If you have any questions or concerns, contact US Environmental Testing for assistance.
1. Maintain Closed-Building Conditions
Keep all exterior doors and windows closed for 12 hours prior to the start of the test. You may use exterior doors for normal entry and exit as needed. During the testing period, continue to keep all windows, doors, and other openings to the outside closed.
2. Set and Maintain the Indoor Temperature
Set your thermostat to 72°F (±5°F) and switch it to "Auto" mode. Do not alter the testing environment in any way. This includes:
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Opening windows or doors
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Changing thermostat or fan settings
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Operating systems that introduce or remove outside air
3. Avoid Activities That May Affect Test Results
Avoid using mechanical systems that draw air out of the building, as they can impact the accuracy of the test. Do not move or tamper with any testing devices once placed.
If anything occurs that might violate testing conditions—such as unexpected changes to ventilation, HVAC settings, or open windows—immediately report it to US Environmental Testing. If the test conditions are compromised, we may need to conduct a re-test.
4. Do Not Remove Tamper Evident Seals
When we place the radon monitors and start the test, we will install tamper-evident seals on all windows. Do not remove these seals until the test concludes.
5. Receive Your Results
The test will conclude 48 hours after the start time. At the time of monitor retrieval, we will provide verbal results. Within 24 hours, you will receive a formal report via email or fax. We can also send a hard copy by mail upon request.
Following these guidelines ensures the most accurate radon measurement possible. Let us know if you need clarification or support at any stage of the process.