Frequently Asked Questions
Common questions about radon testing and mitigation in Billings, MT and Yellowstone County.
Common questions about radon testing and mitigation in Billings, MT and Yellowstone County.
Montana has elevated radon levels statewide. In the State/EPA survey, Yellowstone County homes averaged 3.7 pCi/L, and about 1 in 3 tested above the EPA action level of 4 pCi/L. We recommend testing any home and mitigating at 4 pCi/L or above.
Radon mitigation in Billings typically costs $800 to $1,600 for a standard sub-slab depressurization system. Cost depends on foundation type and radon concentration. Post-mitigation testing is included.
Most installations take 4–6 hours in a single day. Your home is fully usable immediately after. We retest 24–48 hours post-installation to verify results.
Yes, we serve all of Yellowstone County including Laurel, Lockwood, and Shepherd, plus Park City and Columbus in Stillwater County, and can travel to Red Lodge, Hardin, and Roundup.
Yes — we guarantee our systems reduce radon below 4 pCi/L or we return to fix it at no charge. Included follow-up testing confirms results.
Yes. The installation process is clean and minimally invasive. Our technicians work in the basement or crawlspace to install the suction pit, piping, and fan. Most homeowners continue their normal activities during the installation, which typically takes 4–6 hours. Your home is completely usable once we're done.
A properly designed sub-slab depressurization system has minimal impact on your home's heating and cooling efficiency. The system vents radon-laden air from beneath the slab to the outdoors, not from your conditioned living space. In fact, some homeowners notice improved air quality and reduced humidity after installation.
Every system we install includes a visual indicator (a U-tube manometer or magnehelic gauge) that shows whether the system is maintaining proper suction. We recommend annual or biennial re-testing to confirm ongoing effectiveness. If your system fan fails or a seal breaks, radon levels can rise again — periodic testing catches this early.
The EPA recommends mitigation at 4 pCi/L or above. The World Health Organization recommends action at 2.7 pCi/L. Montana state guidance follows the EPA standard. If your test result is 4 pCi/L or higher, mitigation is strongly recommended — and Rimrock Radon can typically schedule your installation within a week of contact.