Radon Testing and Mitigation in Roundup, Montana
Roundup is the county seat of Musselshell County, a small town of approximately 1,800 residents situated about 50 miles north of Billings along US Highway 87. Nestled in the Musselshell River valley, Roundup has a proud ranching heritage and serves as the commercial hub for the surrounding agricultural communities of central Montana. While life in Roundup offers wide-open spaces and a close-knit community atmosphere, homeowners here face a serious but often overlooked health risk: elevated indoor radon levels. The geological formations beneath Musselshell County are rich in naturally occurring uranium, which decays over time and releases radon gas into the soil. This gas migrates upward and can accumulate to dangerous concentrations inside homes, schools, and workplaces without anyone noticing, because radon is completely colorless, odorless, and tasteless.
The EPA classifies much of central Montana, including Musselshell County, as a Zone 1 area for radon potential, meaning the predicted average indoor radon levels exceed 4 pCi/L, the threshold at which the agency recommends corrective action. The sedimentary rock and glacial till deposits that characterize the landscape around Roundup are particularly conducive to radon production and transport. Homes built on these soils are at heightened risk regardless of their age or construction quality. Older homes in Roundup with stone or block foundations may have visible cracks and gaps that serve as direct entry points for radon, but even newer homes with poured-concrete slabs can allow radon to seep through microscopic pores, construction joints, and gaps around utility penetrations. Radon exposure is the second leading cause of lung cancer in the United States after smoking, responsible for an estimated 21,000 deaths annually, making professional testing and mitigation essential for every Roundup household.
Why Roundup Homes Need Radon Protection
Many properties in and around Roundup feature basements and crawl spaces that are especially vulnerable to radon accumulation. The town's location in the Musselshell River valley means that some homes sit on alluvial deposits, loose soils composed of sand, gravel, and silt that allow radon gas to travel freely from deeper rock formations to the surface. During Montana's harsh winters, the freeze-thaw cycle can widen existing foundation cracks and create new pathways for radon entry. Additionally, the pressure differential between heated indoor air and cold outdoor temperatures during winter months can create a stack effect that actively draws soil gases, including radon, into the home through the lowest levels. Homes that rely on private wells rather than municipal water may also encounter radon dissolved in their water supply, which is released into indoor air during showers, dishwashing, and other household water use.
Rim Rock Radon provides comprehensive radon services to Roundup and all of Musselshell County. Our licensed and insured technicians make the drive north from Billings to deliver the same professional-grade testing, system design, and installation that we offer throughout the greater Billings metro area. We begin every project with an accurate radon test to establish your home's baseline concentration. If levels meet or exceed the EPA action level of 4 pCi/L, we design a customized mitigation system tailored to your foundation type, soil conditions, and specific radon entry points. The most effective solution for most Roundup homes is an active sub-slab depressurization system, which creates negative pressure beneath the foundation slab to intercept radon gas before it can enter living spaces. A sealed vent pipe routes the captured gas to a continuously running fan that exhausts it safely above the roofline, where it dissipates harmlessly into the open air. For homes with crawl spaces, we install sub-membrane depressurization systems that seal the earth floor with a heavy-duty vapor barrier and draw radon from beneath it. Every installation includes post-mitigation testing to verify that levels have dropped well below the EPA action level, and we back our work with a written performance guarantee. Call (406) 476-7479 today to schedule your free radon estimate in Roundup.