Protect your health. Test your home.



What is Radon?

Radon is a colorless, odorless radioactive gas produced by the breakdown of naturally-0ccuring uranium in soil, rock and water. Radon can enter your home through your basement, crawl space or concrete slab foundation.

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Radon Testing & Mitigation
Services in St. Louis

St. Louis Radon Test and Mitigation is committed to the health of your family and the safety of your home by providing the area’s most trusted radon testing services and effective radon mitigation systems. We are a fully licensed and insured radon testing and mitigation company servicing a wide range of communities in and around the St. Louis area and Illinois.  We are certified radon professionals and members of the American Association of Radon Scientists and Technologists (AARST). 

We consider it a privilege to help you evaluate and reduce the risk of radon exposure in your home.  We welcome the opportunity to work with you to meet your needs in all aspects of detecting and mitigating radon in the home, and to help provide you with the peace of mind you deserve.

For more information please contact us via the website or call us at 636-200-2875.


How Radon Enters Your Home

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Radon entering the home through water is a small risk compared with radon entering your home from the soil. Well water can bring radon into the home through the shower or other water sources.


Soil and rocks are the main causes of radon issues in a home. Due to the pressure difference between the inside and outside of your home, your home acts like a vacuum drawing radon through foundation cracks and other openings.


Whether there are cracks in the concrete slab, pores and cracks in concrete blocks or floor-wall joints, all exposed openings can allow radon to be brought into the home.


An open drain tile system will allow radon to enter in the home at a faster rate and increase the levels of radon. A sump can also be another area where radon can enter your home. Radon levels should be checked if either of these improvements have been made to your home since you purchased it.

Crawl Space

Radon entering the home through water is a small risk compared with radon entering your home from the soil. Well water can bring Radon into the home through the shower or other water sources.


The first step to help ensure the safety of you and your family’s health and safety is to have your home tested for radon. At St. Louis Radon, our professional testers deploy the latest in computerized electronic real-time radon monitoring technology to provide you with a comprehensive report, including a complete visual graph of radon level data points as recorded over a 48-hour sampling period.

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If testing indicates levels of radon that require action, our team of engineers and technicians will design and install a custom radon mitigation system to safely and effectively redirect radon and other soil gasses out of your home. We also take additional measures to seal and close other possible breaches in the foundation that could let soil gasses into the through cracks or drain tiles systems.

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New Construction

The only way to know if your new home has a radon problem is to test. If your home is built with a passive radon system, you should test it immediately after moving in to make sure that radon levels are below the EPA guideline. Remember: If your radon level is 4.0 pCi/L or above, a fan can be installed easily to lower radon levels well below this guideline.

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What our customers are saying

I just wanted to take a few minutes to let you know how much I appreciated the two gentlemen that came to my house today.  They were polite, professional, patient and friendly.  They also completed the system in the time allotted, allowing me to get to another appointment. I will definitely recommend your company to friends and neighbors.

Carrol Kolwyck

I'm writing to express how pleased I was with the experience. They left zero mess and were very professional. Once completed, they walked me through every new piece of hardware, how everything should operate, and what to look for in case I feel something isn't working properly. Thank you!  Well done for such a great staff.

Shannon Dorton

The job was first rate, piping looks great, I'm very pleased with the entire experience.  Please do not hesitate to use us for references. We are very happy with the work.

Joe & Sharon Delmore

We had on our radon system installed yesterday morning and I just wanted to let you know what a great experience it was. It was done so professionally and it looks so nice in our basement. Overall, it was a great experience and we'll definitely recommend Saint Louis Radon to everyone!

Sara Spears

I couldn’t be happier with the results, and I would not hesitate in recommending St. Louis Radon to anyone who might need a reliable radon mitigation contractor.

Clayton A. Johnson

Just wanted to drop you a few lines to say how satisfied I am with the install of my new system.  John and Rick were very professional, and it was so nice to have installers, who I could tell, take a lot of pride in their work. I thanked John and Rick and told them what a great job they did.  Thanks again!

Gary Girard

I was totally impressed with the knowledge, skill and professionalism shown by the St. Louis Radon Team. They patiently answered my questions and explained. They even explained it all to my neighbor, who came over to learn all there is to know about Radon! I highly recommend your services to anyone needing Radon eradication! Thanks for an outstanding job!

Connie Maloy

I am very happy with the experience I had with your company. Thanks again for doing a quality installation and having your people show up on time and ready to work. I appreciate a company that does what it says it will and can do. I work in building products for 35 years and no a quality company when I see one.

Ron Russel

Thank you so much for the information and for the wonderful job your company did installing our radon mitigation system. Your professionalism was very much appreciated and I would and will recommend your company to anyone needing your services.  As a design professional, I am truly impressed with the quality of everything you company has done.

Charles M. Luebke, AIA