Radon Testing in St. Louis, MO
Radon Testing in St. Louis, MO
Radon is a naturally occurring radioactive gas that forms from the decay of uranium in soil and rock. It’s invisible, odorless, and tasteless — and it’s the second leading cause of lung cancer in the United States after smoking, responsible for approximately 21,000 deaths per year according to the EPA.
Testing is the only way to know if dangerous radon levels are present in a home. SafeSpec Home Inspections provides professional radon testing throughout St. Louis, St. Charles County, and Jefferson County.
| ⚠️ The EPA action level for radon is 4.0 pCi/L. Levels at or above this threshold require mitigation. The average indoor radon level in the U.S. is 1.3 pCi/L — but Missouri homes, particularly those with basements, frequently test higher. |
How Radon Testing Works
SafeSpec coordinates the full radon testing process on your behalf. We handle the scheduling, placement, retrieval, and lab submission so you don’t have to manage any of it yourself.
Testing is conducted by a trusted, vetted radon measurement contractor. You’re welcome to supply your own testing contractor if you prefer — we’re flexible. Either way, SafeSpec can manage the entire process end to end, coordinating with your real estate transaction timeline to make sure results are back when you need them.
Results are typically returned within 24 hours of lab analysis. Your written report will document the radon concentration measured and whether the level is below or above the EPA action threshold.
Why Radon Testing Matters in Missouri
Missouri is classified as a mixed radon zone. Zone 1 counties — where predicted average indoor radon levels are highest — include several counties in the greater St. Louis region. Jefferson County in particular has a higher proportion of homes testing above the EPA action level due to local soil and geology.
Homes with basements are at the highest risk because radon enters through foundation cracks, construction joints, and gaps around pipes. A basement that’s used as a bedroom or living space significantly increases occupant exposure.
Radon During a Real Estate Transaction
Radon testing is one of the most commonly requested inspections in a real estate transaction. If elevated levels are found, a radon mitigation system (sub-slab depressurization) can typically be installed for $800–$1,500 and reduces levels by up to 99%. Knowing before you close gives you the information — and the negotiating position — you need.
White-Glove Coordination
Don’t want to deal with the scheduling back-and-forth? We handle it. SafeSpec will coordinate the testing contractor, placement and retrieval timing, lab submission, and report delivery on your behalf. One call to us and it’s handled.
Serving the Greater St. Louis Area
- St. Louis City and St. Louis County
- St. Charles County — St. Charles, O’Fallon, Wentzville, Lake Saint Louis
- Jefferson County — Arnold, Festus, Hillsboro, Crystal City, Herculaneum
| Ready to Schedule? Call or text (314) 375-6014 | Inspector@SafeSpec.net | safespec.net Serving St. Louis City & County | St. Charles County | Jefferson County |