Radon is colorless, odorless, and completely undetectable without a test, which makes it one of the easiest home hazards to overlook and one of the most important to check for. Radon testing in Fremont County carries extra weight because of where we sit on the EPA’s radon potential map. According to the EPA’s official Map of Radon Zones, Fremont County is classified as Zone 1, the agency’s highest radon potential category, meaning homes here have a predicted average indoor screening level above 4 picocuries per liter, the point at which the EPA recommends taking action.
That designation does not mean every home in Lander, Riverton, or the surrounding area has a radon problem. It means the geology underneath us, largely uranium-bearing rock formations common throughout central Wyoming, creates the conditions where radon gas can seep up through soil and enter a home through foundation cracks, sump pits, and gaps around pipes. Whether a specific house has elevated levels depends on the individual foundation, ventilation, and construction details, which is exactly why this kind of testing needs to happen on a home by home basis rather than being assumed one way or the other.
How Radon Testing Actually Works
At Fremont Safety, radon testing is typically performed using a continuous monitor placed in the lowest livable level of the home, basements included when applicable, since radon concentrations are generally highest closest to the ground. The device runs for a minimum 48 hour period, recording readings continuously rather than relying on a single point in time snapshot. This approach accounts for natural fluctuations in radon levels caused by weather, barometric pressure, and even the time of day.
Once the testing period ends, we pull the data and provide a clear report showing the average concentration over the full test window. Results are measured in picocuries per liter, and anything at or above 4 pCi/L is generally considered actionable by EPA standards, meaning a radon mitigation system is worth strongly considering.
Why This Matters More in Older Fremont County Homes
Nearly half of Wyoming’s housing stock was built before 1982, and a lot of that older construction throughout Lander and Riverton was not built with radon-resistant techniques in mind. Newer homes often include passive radon mitigation systems installed during construction, a vapor barrier and vent pipe system that reduces the chance of gas buildup before it ever becomes a problem. Older homes typically have none of that, which means radon testing in Fremont County is often the only way to know whether an aging foundation is quietly allowing gas to accumulate indoors.
Basements and crawlspaces common in older Lander homes add another layer of risk, since these below grade spaces sit in more direct contact with the soil gas is escaping from. A home with a finished basement being used as a bedroom or living space deserves particularly close attention, since occupants spend more time in the area where concentrations tend to be highest.
What to Do With Elevated Results
If a test comes back above the action level, the standard recommendation is installation of a radon mitigation system, most commonly a vent pipe and fan system that draws gas from beneath the foundation and safely releases it above the roofline before it can enter the living space. These systems are effective, relatively affordable to install, and can typically reduce indoor radon levels by more than 90 percent once operational. We are glad to walk buyers and sellers through what mitigation typically involves and what it costs in this area, so a high reading feels like a solvable problem rather than a reason to walk away from an otherwise solid home.
Frequently Asked Questions
Is radon testing required to buy a home in Fremont County? It is not legally required, but most lenders and real estate agents strongly recommend it given Fremont County’s Zone 1 radon designation, and many buyers make it a standard part of their due diligence.
How accurate is a 48 hour radon test? A properly placed continuous monitor over a 48 hour period gives a reliable average reading for that specific window. Radon levels do fluctuate seasonally, so a long-term test or a second short-term test can add confidence if results are borderline.
What radon level is considered dangerous? The EPA sets 4 picocuries per liter as the action level where mitigation is recommended, though the agency notes that levels between 2 and 4 pCi/L are also worth considering for reduction, since no level of radon exposure is entirely risk free.
Can I test for radon myself instead of hiring a professional? Consumer test kits exist, but a professional continuous monitor placed by a trained inspector tends to produce more reliable, tamper-resistant results, which matters most when radon testing is being used to inform a real estate transaction.
Fremont Safety provides radon testing, home inspections, sewer scope inspections, and more throughout Lander and the surrounding Fremont County area. Schedule Your Inspection today to find out what is really in your home’s air.
Fremont Safety provides Home Inspection, Radon Testing, Sewer Scope Inspections, and VA/FHA Water Testing for the Lander Area including: Riverton, Dubois, Shoshoni, Fort Washakie, Hudson, Pavillion.